Prevent catastrophic damages and injuries from a failed roofing system. Knowing how long different roofing systems are supposed to last will help you get it evaluated and replaced when the time is right.

atlantacommercialroofingcontractors.com gathered the following information to help you determine when your damaged or aging roofing system needs to be replaced.

What Impacts How Long a Roof Lasts?

Each type of roofing system has a projected lifespan. What determines a roofing system’s longevity includes:

• Bi-annual inspections (spring and fall) under a maintenance program
• Early detection of hidden problems/defects in the roofing system
• Material quality
• Installation quality (workmanship)
• Weather patterns (severe weather events like hail, tornadoes, hurricanes, etc.)

A well-installed roofing system with continuous maintenance, care, and eventual repairs can last from 20 to 100 years, depending on the roofing material. Consider the following roofing systems:

Composition Shingles 15 – 40 Years

Composition shingles are a composite product made from a fiberglass or cellulose mat, asphalt, and mineral granules. Composition shingle roofing systems are also environmentally friendly. Most composite roof materials are made with a paper backing and produced using recycled materials.

This durable roofing system can last an average of 15 to 20 years with minimal maintenance and care. When properly installed and maintained, this roofing system can last up to 40 years.

Signs that a composition shingle roof replacement may be necessary include:

• Visible signs of roof or shingle aging
• Multiple leaks
• Missing mineral granules
• Shingle curling (most common along edges)
• Missing shingles
• Moss growth on shingles
• Algae growth (dark stains running down the roof slope)

Severe weather events are common factors in roofing system damages and failures. After such events, your roofing system should be inspected and repaired if possible.

Note 1: A typically hidden problem with shingle roofing systems is bad shingle adhesion. Contributing factors often include manufacturing inconsistencies, poor installation practices, advanced aging and shingle deterioration, cold weather installations, lack of attic ventilation, and repeated thermal expansion and contraction.

Note 2: Another, often hidden, issue occurs when gaps or openings are left in a roofing system's eaves, soffit, or fascia. These openings allow small animals/wildlife to enter attic space, destroying insulation or compromising a roofing system's integrity from the inside out.

Asphalt Shingles 10 – 20 Years

Asphalt shingles are not made solely of asphalt. They consist of either a fiberglass or felt paper base coated with a waterproof layer of asphalt and topped with mineral or ceramic granules. Over the past four decades, fiberglass-based shingles have been the more requested product.

This roofing system can last an average of 10 to 15 years with minimal maintenance and care. When properly installed and maintained, this roofing system can last up to 20 years.

Similar to composition shingles, signs that an asphalt shingle roof replacement may be necessary include:

• Visible signs of roof or shingle aging
• Multiple leaks
• Missing mineral granules
• Shingle curling (most common along edges)
• Missing shingles
• Moss growth on shingles
• Algae growth (dark stains running down the roof slope)

Note: Shingle roofing systems often hide water damage from failed flashing in valleys, around chimneys, and in poorly constructed chimney crickets or saddles. This type of failure can lead to multiple leaks, deck rotting, and eventual roof failure.

Severe weather events are common factors in roofing system damages and failures. Again, after such events, your shingle roofing system should be inspected and repaired if possible.

Wood Shingles Up to 30 Years

Wood shake roofing and a wood shingle system are both typically made from cedar, cypress, redwood, or pine. While these wood products have similarities, they're produced differently. Wood shingles are usually machine cut on both sides, and wood shake material is created by splitting rectangles from a log.

Being rot and insect resistant, a wood shingle roofing system can last up to 30 years with diligent annual upkeep.

Signs that wood shingle or wood shake roof replacement may be necessary include:

• Visible signs of aging or damage in multiple areas of the roof
• Multiple leaks
• Cracking, splitting, or warping shingles
• Missing shingles

Often, these signs will be confined to a section of the roof, which may mean only a repair is needed.

Note: A commonly hidden problem with wood shingle roofing systems is a poorly ventilated attic. Moisture that cannot escape the attic is forced upward through the roof structure causing shingles to curl and buckle. This uneven warping traps water, exacerbating the roof's deformation and rapid decay of its framework.

Single-ply Membrane (TPO & PVC 15-30 Years, EPDM 30-50 Years)

Single-ply membrane roofing systems require fewer seams than asphalt roofing systems and don't require torches or hot asphalt for installation. Single-ply systems come with prefabricated finishing accessories that make installation easy. Consider the following:

TPO – TPO (thermoplastic polyolefin) is a single-ply membrane and is one of the fastest-growing commercial and residential roofing systems. TPO roofing systems are made of a single layer of synthetics and a reinforcing scrim used to cover flat roof substrates.

Because TPO is relatively new in the roofing industry, its full lifespan has yet to be determined. This roofing system can last an average of 15 to 20 years with minimal maintenance and care. When properly installed and maintained, this roofing system can last up to 30 years before replacement.

To learn the benefits, cost, and problems related to a TPO roofing system, read the TPO Roofing System Explained article.

Signs that a TPO roof replacement may be necessary include:

• Visible signs of aging or damage in multiple areas of the roof
• Multiple leaks
• Chronic ponding
• Severe alligatoring (shrinkage and cracking)

Note 1: Often overlooked and elusive are damages caused by a parapet wall's failed metal coping. This roofing system malfunction allows water to collect between the TPO membrane and roof substrate, ultimately resulting in leaks, membrane deterioration, and structural damages to the building.

Note 2: Another hidden problem for flat or low-sloped roofing systems occurs when internal drainage (drainage routed through the structure) becomes clogged. A blocked drainage system can lead to ponding and severe water damage requiring costly structural repairs and roofing system replacement.

Detected early, these issues can be halted with repairs. When the roofing system becomes compromised in multiple locations, replacement may be the only option.

PVC – PVC (polyvinyl chloride) roofing is a single-ply roofing system used on commercial, industrial, and residential flat or low-sloped roofs. PVC is among the world’s most widely produced synthetic plastic polymer.

Like TPO, this roofing system can last an average of 15 to 20 years with minimal maintenance and attention. When properly installed and maintained, a PVC roofing system can last up to 30 years before replacement.

Like TPO, signs that a PVC roof replacement may be necessary include:

• Visible signs of aging or damage in multiple areas of the roof
• Long tears or rips
• Multiple leaks
• Chronic ponding
• Severe alligatoring (shrinkage and cracking)

Note 1: Improperly welded or damaged seams can allow water infiltration, often remaining undetected until extensive damages have occurred to the roofing membrane and substrate, requiring the roofing system's replacement.

Note 2: Foot traffic to and from electrical equipment and other rooftop installations can result in membrane tears and roofing system damage that can also go undetected until such damages require extensive repairs or roofing system replacement. This type of damage can be prevented by installing reinforced walkways or paths wherever foot traffic may be required.

Detected early, these issues can be halted with repairs.

PVC is somewhat similar when compared to TPO, but there are some unique advantages and we suggest knowing The Difference Between PVC and TPO Roofing Systems.

EPDM – EPDM (ethylene propylene diene polymethylene) is a durable synthetic rubber roofing membrane produced using two primary ingredients, ethylene and propylene, derived from oil and natural gas.

Utilized worldwide in the roofing industry, EPDM membranes exhibit a high level of stability as they age. This roofing system can last an average of 30 years with minimal maintenance and care. However, when properly installed and maintained, an EPDM roofing system can last up to 50 years before requiring replacement.

Signs that an EPDM roof replacement may be necessary include:

• Visible signs of aging or damage in multiple areas of the roof
• Long tears or rips
• Multiple leaks
• Chronic ponding
• Severe alligatoring (shrinkage and cracking)
• Use of improper repair materials, including asphalt and roofing cements

Note: One of the more elusive complications for this and all other flat roofing systems is an incorrect slope (these roofing systems are often referred to as low-slope roofing systems). If the slope is too low, ponding can occur with heavy precipitation or even the slightest drainage obstruction. Ponding or water pooling leads to rapid deterioration of all roofing system components and will likely result in the need for a complete roofing system replacement.

To learn more of the benefits, installation process, cost, warranty, and problems with an EPDM roofing system, read EPDM Roofing System Explained.

Built-up Roofing (BUR) 30+ Years

Built-up roofing systems consist of multiple layers of asphalt alternated with felt sheets applied over the roof deck (substrate), vapor retarder, and insulation that is attached to the roof decking. The system is then covered with a reflective membrane (cap sheet) or coating system.

Depending on the climate and materials used, a built-up roofing system has an average lifespan of 20 years. Well-installed and maintained BUR systems have been known to last 30+ years.

Signs that a BUR roof replacement may be necessary include:

• Multiple leaks (especially after having been repaired)
• Chronic ponding
• Severe weather or impact damage

Note: Leaks occurring in a built-up roofing system are often elusive, remaining hidden until severe damage has occurred to the roofing system and building structure. When a layered roofing system such as this develops multiple leaks, the likely course of action is to replace the system entirely.

To learn more of the installation process, benefits, cost, warranty, and potential problems with a Built-up roofing system, read the Built-up Roofing System (BUR) Explained article.

Modified Bitumen (ModBit) 15 – 25 Years

Modified Bitumen (ModBit) roofing is an asphalt-based roofing system similar to Built-up-Roof (BUR) and is designed for structures with low-slope or flat roof structures. Its five layers of protection make this roofing system one of the most trusted in the industry today.

Location, maintenance, and roof design are influencing factors on this system’s longevity. This roofing system can last an average of 15 years with minimal maintenance and care. When properly installed and maintained, a ModBit system can last up to 25 years before needing replacement.

Very similar to BUR, signs that a ModBit roof replacement may be necessary include:

• Multiple leaks
• Chronic ponding
• Severe weather or impact damage

Note 1:When this or other flat roofing systems are ballasted with gravel or stone, repairs will often require the removal of that gravel or stone. This process may ultimately require the partial or complete replacement of the roofing system.

Note 2: A common and barely noticeable problem with ModBit roofing systems involves vibrations from mechanical equipment causing mechanical fasteners to loosen and back out, leaving holes in the membrane. As this condition progresses, severe water damage including rusted components, substrate or decking deterioration, leaks, and costly structural damages occur and can remain virtually unnoticed until a partial or total failure of the roofing system.

Note 3: Roof coatings are commonly applied to aging roofing systems to extend their lifespan. In doing so, a roof coating may fail, allowing slow leaks to develop and remain undetected until severe structural damages occur. These damages become evident as interior leaks, sagging areas in the roof, severe ponding, and roofing system failure if left to develop.

To learn more about the modified bitumen product, benefits, warranty, cost, and potential problems with this roofing system, see this Modified Bitumen Roofing System Explained article.

Metal Roofing Up to 70 Years

Metal or tin roofing is a popular roofing system around the United States and in Canada. The term “tin” is used interchangeably with metal, steel, or galvanized steel roofing. However, tin is an incredibly rare element and unused for roofing.

This incredibly durable roofing system can last an average of 25 to 40 years with minimal maintenance and care. When properly installed and maintained, a metal roofing system can last up to 70 years before requiring replacement.

Signs that a metal roof replacement may be necessary include:

• Multiple leaks
• Rusting components
• Multiple damaged panels
• extensive weather or impact damage

Note: Due to the expansion and contraction of metal roofing, fastening and anchoring systems can weaken and fail over time. This problem can result in complete roofing system failure and is often only detected during routine maintenance visits.

To learn whether this type of roof suits your needs, read Metal Roofing Advantages and Disadvantages.

Clay Tiles 50 – 75 Years

In use since the 17th century, clay tiles are made by baking molded clay. Tile density is determined by heating time and at what temperature. Known for their ability to withstand high winds, hail, and fire, these tiles are produced in white, yellow, orange, and brown shades.

A clay tile roofing system can last an average of 50 years. With proper installation and maintenance, a clay tile roofing system can reach 75 years before replacement is needed. In rare cases clay tile roofing can even reach a whopping 100 years.

Signs that a clay tile roof replacement may be necessary include:

• Multiple cracked, damaged, or missing tiles
• Roofing system sagging
• Severe weather or impact damage

Note: While clay tile roofing systems can be long-lived, flashing failures (corrosion or cracking), and fastener failures (rusting) often result in water damage to the roof's decking and multiple leaks in the structure below. This type of damage can remain dangerously elusive, only appearing during a maintenance inspection or when the roofing system partially or completely fails.

When damages are minimal or confined to a small area, clay tile roofing systems can be easily repaired. More extensive damages will likely require partial or full replacement.

Roofing Maintenance Program

Roof maintenance plans are provided by commercial and residential roofing contractors, in which they agree to perform scheduled inspections, cleaning, debris removal, and scheduled or recommended preventative roof maintenance.

Acquiring a roofing maintenance program from a licensed roofing contractor allows property owners to protect the roof’s warranty provisions, extend the roof’s lifespan, and ultimately save money by preventing significant damages and costly repairs.

Most roof warranties require a minimum of one roof inspection per year performed by an authorized contractor. These inspections allow early detection of problems and their timely repair before developing into catastrophic problems, leading to a roof’s replacement.

Commercial Roofing Maintenance Programs and Services can greatly extend the life expectancy of your roofing system. If you are beyond repair and in need of a new roof, consider starting a maintenance plan after its replacement; a preventative service will add years to the life of your roof, and considerable savings to your investment.

Commercial And Residential Roof Replacement

In this article, you discovered information about roofing system longevity to help you determine when your roof should be repaired or replaced.

When you know your roof’s projected lifespan, the durability of its materials, and have diligently provided for its care and maintenance, it is likely that your roof will far outlive its life expectancy.

Ignoring your roof and its maintenance needs will sharply abbreviate its lifespan, potentially leaving you with costly repair bills, significant leak damage, and in need of an emergency replacement when it suddenly fails.

Sources:
epdmroofs.org/what-is-epdm/
asphaltroofing.org/bur-multi-ply-built-up-roofing/
energy.gov/energysaver/design/energy-efficient-home-design/cool-roofs

See When Does a Roof Need To Be Replaced? for the first version of this content.

Don’t invest your resources in an inadequate roofing system for your commercial property. Uncovering the benefits and properties of a built-up roofing system can help you make informed decisions when installing a new roof or replacing your existing roofing system.

atlantacommercialroofingcontractors.com gathered the most helpful information about built-up roofing, its installation process, warranty, associated costs, frequently asked questions, and potential problems with built-up roofing systems.

Built-up Roofing – Production Process & Properties

Built-up roofing systems, referred to as BUR, have been in use in the U.S. for over a century. This roofing system is also known as a “tar and gravel” roof. BUR systems are typically composed of alternating layers of bitumen and reinforcing materials that create a membrane.

This roofing system gains its waterproofing and durability from its layered structure, consisting of a “built-up” or layered combination of components, including:

1. Substrate or Decking
2. Roof Insulation
3. Roofing Asphalt
4. Venting Base Sheet (Cover Board) with Roofing Asphalt
5. Ply Sheet with Roofing Asphalt
6. Slag or Gravel in Asphalt or a Modified Bitumen Cap

Note: When a modified bitumen membrane is used to cap a BUR system, this combination is referred to as a “hybrid” system.

Roofing asphalt (bitumen) commonly used in BUR systems includes:

Asphalt – Asphalt (a petroleum product refined from crude oil) requires heating before application with a mop or spreader

Coal Tar – Coal tar (derived from the distillation of coal) also requires heating before application with a mop or spreader

Cold-Applied Adhesives – These adhesives are solvent-based asphalts that don’t require heating prior to application

Surfacings used on BUR systems may be (or a combination of):

Aggregate – Gravel, slag, crushed stone, and/or mineral granules are common aggregates

Cap Sheets – Commonly made with glass-fiber or mineral surfacing

Asphalt – Hot Asphalt spread or mopped over the entire surface

Alternative Coatings – Aluminum and elastomeric coatings are commonly applied as surfacing for BUR systems

Benefits of Built-up Roofing

In use for over a century in the U.S., properly installed BUR systems provide the following benefits:

• Well-installed, a BUR system can last more than 30 years
• Provides excellent waterproofing protection
• Creates a continuous sealed surface
• Seams are very well sealed (in some cases, many times over)
• Provides exceptional UV protection
• Once installed, the system is extremely low-maintenance
• Excellent impact resistance
• Excellent fire resistance

Along with these benefits is traction. Often overlooked, if your roof has foot traffic, a BUR system may be ideal due to gravel providing an excellent grip. This becomes evident during severe weather.

Built-up Roofing Installation and Warranty

The installation of your built-up roofing system, when properly installed, is a moderately fast and non-intrusive process.

A built-up roofing system can be installed using hot asphalt or cold adhesives. A standard built-up roof system is a multiple layered system applied in such a way that creates a seamless roof. The following can influence the end result of the roofing system’s installation:

• Proper roof slope for efficient draining
• Correct installation and fastening of insulation
• Correct application of cold adhesives when used in place of hot asphalt
• Proper placement and overlapping of material
• Drip edge seamlessly connected around the perimeter of the roof

In addition to high-quality installation, a warranty is valuable when the installation or components of your roof fail. There are two types of warranties to consider when installing or replacing this or any other roofing system:

Contractor’s Warranty – This warranty covers the workmanship and installation of your roofing system by the contractor. The contractor guarantees their work for a set period (3, 5, 10-year period, etc.), or for the lifetime of the roofing system. A contractor’s warranty should include the following:

• A list of all covered items
• Actions or events that may void the warranty
• When/If the warranty expires

The above installation and warranty information underscore the absolute necessity to thoroughly vet contractors before starting a roofing installation or replacement.

Note: There is no established industry standard for the duration of a contractor’s workmanship warranty.

Manufacturer’s Warranty – This warranty covers defects in the roofing material used in your roofing system. Once installed, your contractor should provide you with manufacturer’s warranty certificates.

An example of material failure would be premature alligatoring (small cracks in the roofing surface from shrinkage). Unless it is determined to result from poor or improper installation, a claim can be leveraged against the manufacturer’s warranty.

Built-up Roofing Cost

Collecting estimates for a roofing system can be a tedious experience. There is often a significant disparity from one quote to the next, which reinforces the necessity to collect at least three bids from three reputable roofing contractors.

Prices for installing a built-up roof system may vary with the size/complexity of the roof, time of year, material brand and quality, method of installation, and the amount of labor required taken into consideration. You can expect to see pricing in the following ranges:

Tear-off – Unless your new roof is installed over your current roof, the old one will be removed.

This process can range between $100 and $200 per square (1 square = 100 square feet).

Tip: If this cost gets bundled in material and installation pricing. Request that it be detailed separately in your estimate(s).

BUR Material – will fall between $100 and $175 per square

BUR Installation (Labor) – can range from $300 to $525 per square

Maintenance Contract – Commercial roofing maintenance program prices vary from contractor to contractor

Using the price ranges above, you can expect to see bids, including tear-off, material, and installation for a 1,000 square foot roof between $5,000 and $9,000.

Consumer Tip: In the roofing industry, installations are typically more expensive in late spring and summer months. If possible, schedule your installation for the off-season (early spring and fall).

Disclaimer: The above pricing is in no way intended to represent actual bid values and only serves as an estimated market price range.

Built-up Roofing Problems

With new materials, installation methods, and technology, BUR systems are becoming less popular. That said, a built-up roofing system may still be the best option for your commercial building. Before making any decision, consider the following potential problems sometimes associated with a BUR system:

• High wind may cause rocks or gravel to be blown off the roof (potentially damaging nearby structures or persons)
• While leaks are easily repaired, finding them may be a laborious and costly process
• This roofing system is heavy in comparison to others. Your commercial roof load should be verified before installing a BUR system
• BUR installation is slower than that of other less complex roofing systems. Increased labor costs can make BUR systems more expensive

You must do your research to see if the pros outweigh the cons of this or any other roofing system. You can check out and compare the alternative options to a built-up roof system to find something better suited for your property’s needs.

People Also Ask

Can built-up roofs be repaired?

Yes. BUR roofing systems are easily and reliably repaired.

How long do built-up roofs last?

A well-installed and maintained built-up roofing system can exceed a 30-year lifespan.

Can built-up roofs handle foot traffic?

Yes. Due to the gravel or slag used in the roof’s finishing, BUR systems are slip-resistant, even in severe weather.

Built-up Roofing Information Revealed

In this article, you discovered essential information on the definition, installation, cost, warranty, and potential problems with built-up roofing systems.

Knowing how BUR systems are installed and maintained will help you make informed decisions on a roofing system for your commercial property.

Allowing yourself to be duped into an inadequate roofing system by an unprofessional roofing company can have very costly repercussions when the roof fails.

Sources:
asphaltroofing.org/bur-multi-ply-built-up-roofing/
everybodyneedsaroof.com/built-up-roof-BUR-membranes
homeadvisor.com/cost/roofing/flat-roof/
porch.com/project-cost/cost-to-install-built-up-roofing

See Built-up Roofing System (BUR) Explained for the first version of this content.

Avoid spending resources on the wrong roofing system for your commercial property, and learn the benefits and properties of a modified bitumen roof. By knowing its advantages and how modified bitumen roofing systems protect your property or commercial building, you can make informed decisions when replacing your existing roofing system.

atlantacommercialroofingcontractors.com gathered the most helpful information about the modified bitumen product, its installation process, the warranty, material cost, frequently asked questions, and the potential problems with modified bitumen roofing systems.

Modified Bitumen – Production Process & Properties

Modified Bitumen (MB) roofing is an asphalt-based roofing system similar to Built-up-Roofing (BUR), designed for structures with low-slope roofs. Modified bitumen roofing membranes appeared first in Europe in the mid-’60s and since have been used in the US and Canada since the mid-’70s.

This roofing system gains its durability from its structure, consisting of a five-layer combination of components, including:

• Insulation – Provides thermal resistance and temperature stability.
• MB Membranes – These membranes are composed of copolymer with polyester or fiberglass reinforcement.
• Modified-Base sheets – These are modified fiberglass base sheets coated with MB asphalt.
• Adhesive – Combined with a bonding agent, this waterproofing material is applied hot or cold.
• Surface – The surface to an MB roofing system increases weather-resistance and shields the roof from ultraviolet rays.

Note: While EPDM roofing material is made from recycled rubber (tires), modified bitumen is made from asphalt and modifying polymer blends.

There are two principal types of MB roofing, including:

APP (Atactic Polypropylene Bitumen) – The use of a thermoplastic polymer gives the asphalt a plastic-like quality. APP modified bitumen increases UV light protection and has greater water resistance.

When APP is torch-applied, the plastic starts melting at 300°F and can be mopped across the roof’s surface, making it easier for roofers to apply.

SBS (Styrene-Butadiene Styrene) – The addition of styrene-butadiene styrene to bitumen gives it a synthetic rubber modification. When heated, SBS becomes sticky and fundamentally different, lacking the liquid flow of heated APP. Since SBS doesn’t melt the way APP does, it requires less heat, which makes it faster to install.

SBS systems can also be installed using cold adhesives, making it suitable for construction or roofing projects where open flames are prohibited.

Benefits of Modified Bitumen Roofing

Some benefits of a modified bitumen roof include:

• Tear-Resistant – The principal advantage that MB roofing has over other commercial roofing systems is its tear resistance. This is due to the combination of fiberglass and/or polyester reinforcement layers under its surface. This trait makes modified bitumen roofing an ideal choice for low-slope roofing with high foot traffic or rooftop equipment.

• Flexible – Flexible low-slope roofing is impact resistant and highly resistant to significant temperature shifts. MB can expand and contract without deforming or losing its structure.

• Energy-Efficient – MB can be installed with a “cool roof” treatment like solar reflectance, resulting in reduced indoor cooling requirements.

• Waterproof – Bitumen is naturally waterproof, and on a well-installed roof, MB is one of the most preferred commercial roofing choices.

• Repair And Maintenance – Repair on an MB roofing system can be done quickly and efficiently using bitumen patches. Low-slope roofing failures usually occur on seals and flashing. However, with proper installation and a roofing maintenance program, such issues should be minimized.


Modified Bitumen Roofing Installation and Warranty

The installation of your modified bitumen roofing system, when properly installed, is a fast, non-intrusive process.

A modified bitumen roofing system can be installed using the torch method, asphalts, or cold adhesives. A standard SBS modified bitumen roof system is a two-ply system applied in rolls overlapping the edge of the previous roll. The following can influence the end result of the roofing system’s installation:

• Proper roof slope for efficient draining
• Correct installation and fastening of insulation (when used) to deter bulging and/or sagging
• Correct application of adhesives (when used) to the substrate
• Proper overlapping of MB material
• Drip edge seamlessly connected around the perimeter of the roof

In addition to high-quality installation, a warranty is advantageous and very valuable when the installation or components of your roof fail. There are two types of warranties you should consider when installing or replacing this or any roofing system:

Contractor’s Warranty – This warranty covers the workmanship and installation of your roofing system by the contractor. The contractor can guarantee their work for a set time period (3, 5, 10-year period, etc.), or for the lifetime of the roofing system. A contractor’s warranty should contain the following:

• A complete list of covered items
• What actions or events may void the warranty
• When/If the warranty expires

The above installation and warranty information underscore the necessity to thoroughly vet contractors before starting roofing installation/replacement.

Note: There is no industry standard for the duration of a contractor’s workmanship warranty.

Manufacturer’s Warranty – This warranty covers defects in the material used in your roofing system. Once installed, your contractor should provide you with a warranty certificate(s).

An example of material failure would be premature seam failure or blistering. Unless it is determined to result from poor or improper installation, a claim should be leveraged against the manufacturer’s warranty.

Modified Bitumen Roofing Cost

Collecting estimates for any roofing system can be a daunting experience. There can often be a significant disparity from one quote to the next, which validates the absolute necessity to collect at least three bids from reputable roofing contractors.

Prices for installing a modified bitumen roof system vary depending on the size/complexity of the roof, time of year, material brand and quality, method of installation, and the amount of labor required. You can expect to see pricing in the following ranges:

Tear-off – Unless your new roof is installed over your current roof, the old one will be removed.

This process can range between $100 and $200 per square (1 square = 100 square feet).

Tip: If this cost ends up bundled in material and installation pricing. Request that it be detailed separately in your estimate(s).

Modified Bitumen Material – will fall between $150 and $300 per square

Modified Bitumen Installation (Labor) – can range from $220 to $350 per square

Maintenance Contract – Commercial roofing maintenance program prices vary from contractor to contractor

Using the price ranges above, you can expect to see bids, including tear-off, material, and installation for a 1,000 square foot roof between $4,700 and $8,500.

Tip: In the roofing industry, installations are typically more expensive in late spring and summer months. Try to schedule your installation for the off-peak season (early spring and fall) if/when possible.

Disclaimer: The above prices are in no way meant to represent actual bid values and only serve as estimated market price ranges.

Modified Bitumen Roofing Problems

Most problems occurring with modified bitumen roofing systems can be traced back to the roof’s installation. The following are commonly reported issues:

• Improper roof slope causing water pooling and degradation of materials
• Seam separation/defects from improper application of adhesives
• Insulation improperly fastened or installed
• Blisters that develop when moisture penetrates the material
• Incorrectly installed flashing
• Membrane tears/punctures from wind-driven debris

You can avoid problems caused by a poor installation by contracting a roofing company with extensive training and experience with modified bitumen roofing systems.

Tip: Always request references from roofing contractors and followup with those references.

People Also Ask

Can you walk on a modified bitumen roofing system?

Yes. Well-installed MB roofing is designed to withstand foot traffic. For areas that support building equipment or heavier foot traffic, the roof can be appropriately reinforced.

How long do modified bitumen roofs last?

Up to 20 years. The life of your roofing system is significantly influenced by the quality of its installation and maintenance program.

Can modified bitumen roofs be repaired?

Yes. When modified bitumen roofs are damaged, there are several ways they can be efficiently repaired.

Modified Bitumen Information Revealed

In this article, you discovered information on the definition, installation, cost, warranty, and potential issues with modified bitumen roofing systems.

By knowing how modified bitumen roofing systems are made, installed, and maintained, you can make informed decisions about having it installed on your building.

When you allow yourself to rely solely on what one roofing contractor says or presents, you are leaving yourself vulnerable to costly repairs after having inferior quality materials poorly installed on your building.

Sources:
asphaltroofing.org/cold-adhesive-sbs-modified-bitumen-roofing-applications/
remodelingexpense.com/costs/cost-of-modified-bitumen-roof/
homeadvisor.com/cost/roofing/flat-roof/
citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.4.1966&rep=rep1&type=pdf

See Modified Bitumen Roofing System Explained for the first version of this content.

Avoid spending your resources on the wrong roofing systems for your flat roof or commercial property. By knowing how EPDM roofing systems can protect your commercial building, you can make informed decisions when installing or replacing your roof.

atlantacommercialroofingcontractors.com gathered information about the definition, installation, warranty, cost, and potential problems with EPDM roofing systems while answering frequently asked questions.

EPDM Roofing Explained – Production, Properties, and Benefits

EPDM (Ethylene Propylene Diene PolyMethylene) is a durable synthetic rubber roofing membrane composed of two primary ingredients, ethylene and propylene, derived from oil and natural gas.

The following will explain the composition, properties, and production of EPDM roofing systems for commercial and residential structures, including its use in the auto industry:

• EPDM roofing material is classified as a single-ply membrane. However, most are comprised of two plies of material to produce one ply. This is done to prevent imperfections from occurring throughout the sheet.
• There are two methods used to produce EPDM roofing material; calendaring or through a roller die extruder.
• Sheet thickness is 45 mils, 60 mils, and 90 mils, which equates to about the thickness of a heavy-duty trash bag.
• EPDM panels can be produced as narrow as 5 feet and as wide as 50 feet, while sheet length can reach 200 feet. This provides maximum coverage with minimal seams.
• EPDM membranes are usually installed using deck adhesive, making them fully adhered (glued down) to the substrate. They can also be installed using a ballasted system or be mechanically attached to the substrate.
• Overlapping EPDM seams can be sealed by applying adhesives, seam tape, or both.
• EPDM membranes come in two primary colors, including black and white.
• EPDM membranes are resistant to oil and chemicals expelled by commercial exhaust vents.
• EPDM roofing material is naturally fire-resistant and is highly UV resistant.
• EPDM roofing systems are highly resistant to wind uplift.
• The life expectancy of EPDM roofing systems is between 22 and 35 years
• The EPA recognizes that ballasted EPDM roofing systems can be a very effective means of lowering rooftop surface temperatures, reducing air conditioning requirements within the structure.

Play this video to see the manufacturing process of EPDM membranes.

While popular in the roofing industry, the principal application of EPDM is within the automotive industry. It is used to manufacture components like weatherstripping, coolant hoses, brake components, and motor oil.

EPDM Roofing Installation and Warranty

The installation of your EPDM roofing system, when properly installed, is a fast and non-intrusive process.

Installing an EPDM membrane is accomplished by fully adhering it (gluing down), and/or mechanically attached or ballasted; the following factors influence the quality of the roofing system’s installation:

• Low roof slope for efficient draining
• Correct installation and fastening of insulation (when used) to deter bulging and sagging
• Correct application of adhesives to the substrate
• Proper use of seam adhesive
• Drip edge seamlessly connected around the perimeter of the roof

In addition to quality installation, a warranty is advantageous and very valuable when the installation or components of your roof may fail. There are two types of warranties to consider when installing or replacing any roofing system:

Contractor’s Warranty – This warranty covers workmanship and installation of your roofing system by the contractor. The company is guaranteeing its work for the roof’s lifetime.

A contractor’s warranty should contain the following:

• A list of covered items
• What can void the warranty
• When/If the warranty expires

The above installation and warranty information underscore the necessity to thoroughly vet contractors.

Note: There is no industry standard regulating the duration of a contractor’s warranty.

Manufacturer’s Warranty – This warranty covers defects in the material used in your roofing system. Once installed, your contractor should provide you with a warranty certificate(s).

An example of material failure would be premature shrinkage. Unless it is determined to result from poor or improper installation, a claim should be leveraged against the manufacturer’s warranty.

EPDM Roofing Cost

Collecting estimates for any roofing system can be an overwhelming experience. There is often a significant disparity from one quote to the next, which validates the need to collect at least three bids from reputable roofing contractors.

Prices for installing an EPDM roof system vary depending on the size/complexity of the roof, time of year, material brand, material quality, method of installation, and the amount of labor involved. Expect to see pricing in the following ranges:

Tear-off – Unless your new roof is installed over your current roof, the old one will be removed. This process can cost between $100 and $200 per square (1 square = 100 square feet).

Suppose this cost is bundled in material and installation pricing. In that case, you can request that it be detailed separately in your estimate(s).

EPDM Material – will fall between $75 and $450 per square

EPDM Installation (Labor) – can range from $350 to $750 per square

Maintenance Contract – These commercial roofing maintenance programs prices vary from contractor to contractor

Using the price ranges above, you can expect to see bids, including tear-off, material, and installation for a 1,000 square foot roof between $5,250 and $14,000.

Tip: In the roofing industry, installations are generally more expensive in the spring and summer months. Schedule your installation for the off-peak season (early spring and fall) if/when possible.

Disclaimer: The above prices are in no way meant to represent actual bid values and only serve as estimated market price ranges.

EPDM Roofing Problems

Most problems occurring with EPDM roofing systems can be traced back to the roof’s installation. The following are commonly reported issues:

• Improper roof slope causing water pooling and degradation of materials
• Seam separation from improper application of adhesives
• Insulation improperly fastened or installed
• Incorrectly installed flashing
• Membrane tears from wind-driven debris

You can avoid problems caused by poor installation by contracting a roofing company with extensive training and experience with EPDM roofing systems.

Tip: Always request references from roofing contractors and followup with those references.

People Also Ask

Can you walk on an EPDM roofing system?

Yes. EPDM is designed to withstand light foot traffic. If you have areas on your roof with heavy foot traffic, have those areas reinforced to avoid rupturing your membrane.

Does EPDM need to be glued down?

Yes. EPDM membranes are fully adhered or “glued down.”

Which is better, EPDM or TPO?

Depends on the intended use and functionality of the property. Both systems have similar qualities. However, TPO is slightly more puncture resistant and can have a more comprehensive warranty.

Does EPDM shrink?

Yes. Despite its durability and reliability, over time, EPDM naturally shrinks.

How good is EPDM roofing?

EPDM roofing materials are extremely durable, resists mold, damages, and is easily repaired. With larger panels and fewer seams, it is very rare for an EPDM roof to leak prematurely.

EPDM Information Revealed

In this article, you discovered essential information about the definition, installation, cost, warranty, and issues with EPDM roofing systems.

By knowing how EPDM roofing systems are produced, installed, and maintained, you can make informed decisions about having it installed on your building.

When you rely solely on what a roofing contractor says or presents, you are leaving yourself vulnerable to costly repairs after having inferior quality materials poorly installed on your building.

Sources:
epdmroofs.org/what-is-epdm/why-epdm/
homeadvisor.com/cost/roofing/rubber-membrane/
tporoofing.org/comparative-guide-to-tpo-vs-epdm-roofing/
energystar.gov/products/building_products/roof_products/other_types_roofing_that_can_save_energy

See EPDM Roofing System Explained for the first version of this content.

Prevent your failing commercial roof from shuttering your business, costing you valuable time and money. Commercial roof coatings can extend the life of your current roofing system by twenty years or more,

atlantacommercialroofingcontractors.com gathered information about commercial roof coating purpose, benefits, installation, types, and maintenance for you to make informed decisions when your commercial roof needs attention.

Commercial Roof Coating Purpose

The purpose of commercial roof coatings is to improve the performance of your roof and increase its lifespan.

Commercial roof coatings protect your property by creating a seamless layer of protection that self-adheres to your existing roofing system. The majority of these coatings are reflective and do not absorb UV rays, keeping your roof and property cooler (making your roofing system a “cool roof”), saving energy and money.

Commercial Roof Coating Benefits

As previously mentioned, commercial roof coatings can help you save money by reflecting UV rays. The benefits don’t stop there, consider the following when determining if a roof coating is the right choice for your building:

No Leaks – Commercial roof coatings eliminate leaks from your roofing system. You may rarely wind up with a leak, but they are easy to fix.

Cool Roof – High solar reflectance (albedo) is the most critical characteristic of a cool roof as it reflects sunlight and heat away from a building, reducing roof and internal temperatures. A high thermal emittance also positively contributes to lowering heat-island temperatures in climates that are warm and sunny.

These properties help roofs to absorb less heat and remain up to 50–60°F cooler than conventional materials during the summer months.

Resistant To Ponding – When your roofing system’s drains get partially or entirely interrupted, water will back up and settle in the lowest areas of the roof. Due to the coating’s seamless application, water penetration is prevented until you can correct the problem with the drainage system.

Low-Cost Solution – A commercial roof coating application is an inexpensive alternative to roof replacement that, when properly applied, can significantly extend the life of your roofing system, making its cost-benefit even greater.

• $8,000 to $16,000 is the range you can expect to pay for a 1,600 square foot flat roof installation (materials and labor).
• $1,040 to $8,000 is the range you can expect to pay for a 1,600 square foot roof coating application (materials and labor).

Longevity – Creating a watertight barrier over your original roofing material can extend its lifespan by as much as 20 years.

Versatility – Commercial roof coatings can adhere to a wide range of substrates. Occasionally, a primer is needed for the coating to adhere to the substrate (more on this below).

Easy Installation – When applying a commercial roof coating, contractors will save time and headaches. At the same time, building owners can get their roof revamped faster for less money and without interrupting operations within the building.

While there are impressive benefits associated with nearly every aspect of commercial roof coatings, if your roof has suffered catastrophic damages or has completely failed, it may be necessary to replace it altogether.

Read more about installing a new roof at atlantacommercialroofingcontractors.com/commercial-roof-installation/

Commercial Roof Coating Installation

A roof coating installation is a simple process. As mentioned above, it is one of the benefits. The following will bring into focus just how easy it truly is:

Roof Inspection – A roof inspection is the first step in this process, and the professional performing it will be looking for the following:

• Storm, animal, or impact damages
• Shrinkage (membrane roofing systems)
• Damaged sheet metal (metal roofing systems)
• Damaged flashing
• Loose protrusions
• Drain blockages
• Pooling water
• Previous or current leak damage
• Structural integrity

These inspections are most effective when performed within 48 hours after rainfall.

Roof Repairs – Once your inspection is done, you’ll have a list of damages or irregularities to fix. Before you can apply a roof coating, all problems must be halted and removed. If a roof coating is applied to a roof with wet insulation, loose protrusions, structural problems, etc., those problems will be sealed in and continue to cause problems.

Clean the Roof – Once all repairs are complete, the final activity before installation is to clear the roof of:

• Tools and equipment
• Debris
• Dirt
• Oil/Exhaust buildup

Remove everything that is not a part of the roofing system. Using a power-washer, brooms, and industrial vacuums are effective ways of cleaning your roof before coating application.

Install the Roof Coating – After the roof has been inspected, repaired, and cleaned, your roofer can properly apply your roof coating. Coatings can be applied by rolling them on or spraying them on the roof’s surface. Done correctly, the coating will cure over 24 hours, leaving your roofing system rejuvenated and sturdy for up to 20 years.

Commercial Roof Coating Types

The following are common types of roof coating that can be applied to your existing commercial roofing system:

Acrylic Coatings – Acrylic coatings come in solvent and water-based formulas, and the qualities of the coating depend on the selected formula. Acrylic coatings have outstanding weathering properties and reflect UV rays. The selection of a formula depends on the type of the roof, adhesion, regional temperature fluctuations, etc.

Silicone Coatings – Silicone coatings are commonly applied in regions subject to an abundance of rain, leaving the roof wet for long periods. These coatings are also highly effective at reflecting UV rays, helping commercial structures stay cool.

Butyl Elastomeric Coatings – Butyl elastomeric coatings are made from butyl rubber and possess excellent flex properties, adhesion to multiple substrates, and resistance to most weather and temperature conditions.

Read more about butyl elastomeric coatings at atlantacommercialroofingcontractors.com/butyl-elastomeric-roof-coating-explained/

Polyurethane Coatings – Polyurethane coatings are solvent-based and come in either aromatic or aliphatic variations. Polyurethane coatings have high abrasion resistance traits and are preferred on roofing systems with high foot traffic or regions that experience frequent hailstorms.

Commercial Roof Coating Maintenance

Should you acquire a maintenance program to cover your roof coating and roofing system?

Yes. In the same way you would contract a professional roofing service to maintain your roof without a roof coating, you should acquire an equivalent maintenance program once your roof coating is installed. Some of the benefits include:

• Bi-annual inspections
• Emergency inspections after severe weather
• Light maintenance and repairs
• Preventive maintenance
• Gutter and drain cleaning
• Debris removal

For more in-depth information about maintenance programs and services, read atlantacommercialroofingcontractors.com/maintenance-programs-services/

Commercial Roof Recoating

One of the added benefits to getting a roof coating is that once you near the end of its lifespan, you can have it recoated, adding another 15 to 20 years to the life of your roofing system.

Note: Some municipalities have codes that address commercial roof recoating and may limit the number of times a roof can be coated before requiring repair or replacement. Visit your city’s website and search for “roofing codes” or call their “Office of Buildings/Construction” for more information.

Coating Your Commercial Roof

In this article, you discovered information about the purpose, benefits, installation, types, and maintenance programs associated with commercial roof coatings.

By informing yourself about commercial roof coatings, you can make well-informed decisions when it’s time to address roofing issues, or take action to prevent them.

Allowing your roof to remain fully exposed to the elements can dramatically reduce its lifespan, leading to premature problems and failure. Significant problems or premature replacement can lead to you exceeding your roofing budget and costing your company capital that could be used in other areas.

Sources:
homeadvisor.com/cost/roofing/seal-a-roof/
roofcalc.org/flat-roof-calculator/
henry.com/fileadmin/pdf/current/tds/HE280DC_techdata.pdf
www2.epa.gov/heat-islands/using-cool-roofs-reduce-heat-islands

See Commercial Roof Coatings for the first version of this content.

Avoid catastrophic financial loss and indefinite business closure from a collapsed roof at your building or commercial property. By knowing the signs that indicate an imminent roof collapse, and what preventative measures you can take.

atlantacommercialroofingcontractors.com gathered information about the signs that precede a roof collapse and what you can do to prevent it.

Sagging Roof or Ceiling

Contact your roofing company immediately if your ceiling and/or roof starts to sag. This is an alarming sign of structural failure that needs to be investigated and corrected before your roof fails altogether.

If you do not have a roofer, read Commercial Roof Repair, Insurance Claims, and Hiring Contractors to learn what qualifying questions to ask and what attributes to look for when hiring a roofing contractor.

My Roof Is Leaking or Signs of Water on the Ceiling

A leaking roof is never a good sign. Roof leaks are evidence that water is reaching your roof’s support structure and potentially causing devastating damages.

Once you spot a leak, you should have your roofer identify the source and evaluate the extent of structural damage sustained, if any.

Note: Any time your roof is leaking is cause for alarm. This problem needs to be fixed fast.

Sprinkler Heads and Ceiling Tiles Out of Alignment

If you notice your ceiling tiles or sprinkler heads out of alignment, your ceiling has shifted. Your ceiling isn’t supposed to move. If you notice a misalignment of your ceiling tiles or sprinklers, you need to find out why and correct it fast.

Doors and Windows Have Become Difficult to Open or Close

Similar to ceiling tiles or sprinkler heads out of alignment, if your doors and windows have become increasingly difficult to open or close, structural shifting has likely occurred.

If this is the case, this shifting can cause your roof’s support system to buckle and fail. Ironically, when you detect a problem with doors and windows, immediately call your roofer.

Cracks in The Exterior Walls of The Building

Cracks in the masonry on the exterior of your building are a clear indication that something is terribly wrong structurally. Among other possibilities, it could be a signal that your roof has become unstable and nearing failure.

To avoid catastrophic damages, have the building engineers inspect the structure and get your roofer on the scene to evaluate the integrity of the roof.

Note: Cracks in the interior walls, support columns, and/or ceiling also indicate severe structural problems. These cracks don’t happen without reason and should be promptly investigated.

Severe Weather Damage

Depending on the region you are located in, many weather-related factors can cause or contribute to the failure of your roof:

• Hurricanes
• Tornadoes
• Wind Storms
• Hail Storms
• Wildfires
• Snow Accumulation
• Extreme Temperature Fluctuations

Your roof should be inspected immediately following such weather events. In fact, if you have enough advance warning, have your roof thoroughly examined beforehand.

Note: If you live in areas prone to specific weather events, make sure that your roof/building insurance will cover damages from such events.

Read more about insurance claims following storm damage at atlantacommercialroofingcontractors.com/commercial-roof-storm-damage-insurance-claims/

New Equipment Installation

The installation of new or updated equipment on your roof may add considerable weight to it. In some cases, you may exceed your commercial roof load and put the integrity of your roof and building at risk.

When planning to install equipment on your roof, calculate your roof’s dead load, live load, and transient load capacity to avoid exceeding your total roof load capacity.

Read more about why you should know your commercial roof load at atlantacommercialroofingcontractors.com/what-is-commercial-roof-load-why-you-need-to-know/

Ponding Water

Ponding water may occur from clogged drain systems, a poorly installed roof, or a poorly maintained roof. Regardless of the reason, ponding water adds an incredible amount of weight to your roof structure.

In fact, one gallon of water weighs 8.34 pounds (100 gallons of rainwater can add 834 pounds of dead weight to your roof). When this water accumulates and persists, your roof’s load may be exceeded and lead to its failure.

Creaking and Popping Sounds

Some people believe that popping and creaking sounds are normal in buildings and simply dismiss them. Never assume that your building is just settling. If you hear these types of sounds, have your building engineer and roofer investigate them immediately, they may be occurring because of structural defects or failure.

The Building Has Shifted

If the following signs occur, it may be an indication that your building has shifted:

• The floors have become uneven
• The building “feels” like it has tilted
• Support columns and vertical installations appear to be angled

If your building has shifted on a structural level, there is a risk that your roof will suffer complete failure. Not to mention the risk of your building collapsing.

When the signs mentioned above are noticed, even in the slightest, your building engineer should be called to immediately investigate the cause.

Commercial Roof Collapse

If your commercial roof collapses, you will be forced to stop all production and completely close the building until your roof is replaced, and OSHA inspectors allow its occupation.

Your insurance claim can be denied if the insurance adjuster finds that the collapse was due to a lack of maintenance or a structural failure that could have been prevented.

Read about why commercial roofing maintenance programs are necessary and how they save you money at atlantacommercialroofingcontractors.com/maintenance-programs-services/

Signs of A Potential Roof Collapse

In this article, you discovered many of the signs that indicate an imminent roof collapse and what you can do to prevent it from happening.

By recognizing roof failure warning signs and promptly resolving them, you are protecting your business’ assets and avoiding a potentially lethal situation.

Your failure to act on signs of your roof’s structural failure can result in catastrophic production and financial losses when the roof collapses.

Sources:
eng-resources.uncc.edu/failurecasestudies/building-failure-cases/hartford-civic-center/
fo.umich.edu/pdf/Protecting_Buildings_from_Freeze.pdf
web.wpi.edu/Pubs/E-project/Available/E-project-081409-132533/unrestricted/IQP-Final.pdf
citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.531.7105&rep=rep1&type=pdf

See Commercial Roof Collapse Warning Signs for the first version of this content.

Without knowing the pros and cons of TPO and PVC, you risk buying a roofing system that’s not suitable for your specific property needs. Even though the membranes may appear to be the same, PVC and TPO roofing systems are quite different.

atlantacommercialroofingcontractors.com gathered essential information about the composition and differences between PVC and TPO roofing systems.

PVC vs. TPO – What Is Their Composition?

Looking at a completed PVC or TPO installation, you may think the material looks identical. Still, the two are very different in composition.

PVC (Polyvinyl Chloride) – This membrane consists of two PVC plies that sandwich a polyester reinforcement sheet. Included in the manufacturing of PVC plies are:

• Ultra-violet light inhibitors
• Color pigments
• Fiberglass or polyester reinforcement
• Plasticizers (for plasticity and flexibility)
• Biocides (help deter mold, bacteria, algae, rodents, and insects)

Hot-air welded seams help PVC roofing remain watertight under a variety of severe weather conditions.

TPO (Thermoplastic Polyolefin) – To produce the TPO membrane, manufacturers will polymerize polypropylene and ethylene-propylene rubber. Like PVC, two TPO plies sandwich a polyester reinforcement sheet. The following are used in the production of TPO plies:

• Ultra-violet light inhibitors
• Color pigments
• Fiberglass
• Talc

Due to the composition of the membrane, plasticizers are not required for its plasticity or flexibility. When designed using the right processes, they perform very well, even in harsh conditions.

Like PVC, TPO employs hot-air welded seams to stay watertight during severe weather and pooling of water. To learn more about TPO roofing system, visit atlantacommercialroofingcontractors.com/tpo-roofing-system-explained/

PVC vs. TPO – Performance Comparison

The following chart will help you compare the performance of TPO and PVC roofing materials and determine the best selection for your new commercial roofing system installation:

In addition to the information above, the following should be taken into consideration:

TPO presents superior results for tear and break strengths, while PVC outperforms in chemical resistance, fire resistance, and overall cost. Restaurants or buildings with grease traps on the roof would be better served by a PVC roofing system.

When it comes to durability, the thickness of TPO and PVC membranes influence their lifespan and pricing significantly. It is strongly recommended that the thickest membrane available (within your budget constraints) be utilized.

Tip: Do not base your roofing system selection on price alone. If you choose to install TPO products, have your contractor provide information about the manufacturer. Work with contractors whose manufacturers have 20 years or more in TPO production and offer a clear warranty policy on their products.

PVC vs. TPO – Warranties

For the purchase of a PVC or TPO roofing system installation, there will be two warranties to take into consideration before closing any deal. First is the manufacturer’s warranty. This warranty will typically cover any defects in the manufacturing of the roofing membrane.

The second warranty is provided by the roofing contractor to cover his workmanship. This warranty should include what items are covered and what actions will void the warranty.

Since the coverage and duration of these warranties depend on the contractor and the roofing system manufacturer, this is on a case-by-case scenario and there is no clear advantage for TPO or PVC.

Tip: Only agree to the installation of a TPO or PVC roofing system once you are satisfied with the coverages promised by the manufacturer’s and contractor’s warranties. Upon completion of the installation, ensure that your warranty certificates and descriptions are kept with your roofing documentation.

PVC and TPO Roof Differences

In this article, you discovered the differences in composition, performance, and durability of TPO and PVC roofing systems.

By knowing how TPO membranes differ from PVC membranes, you can make informed decisions regarding the appropriate roofing system for your commercial building.

Without considering your building’s needs and which roofing system best meets them, you risk making a capital investment on a roof that will likely fail prematurely.

Sources:
astm.org/SNEWS/AUGUST_2003/obeoli_aug03.html
everybodyneedsaroof.com/thermoplastic-membranes
firestonebpco.com/us-en/roofing/tpo-roofing-systems
vinylroofs.org/
rci-online.org/wp-content/uploads/2003-09-whelan.pdf

See The Difference Between PVC and TPO Roofing Systems for the first version of this content.

Prevent your flat roof system from collapsing under the weight of standing rainwater. Without sufficient drainage, water can build up on your commercial roof and cause catastrophic losses when the roof succumbs.

atlantacommercialroofingcontractors.com gathered information on three roof water drainage systems and how they remove potentially thousands of pounds of water from your commercial flat roofing system.

Roof Drain Types

Whether you are installing a new roof or performing renovations on an old roof, the drainage system must be considered and able to usher water off of the roof with ease. The following are three principal flat roof drainage systems:

Inner Drains – These drains are commonly found on large building roofs near the center of the building. Inner drains provide the following benefits:

• Attached to a system of pipes that drain water through the roof, water is kept from the foundation and walls.
• Since the building and walls naturally protect inner drains, there is no concern for their freezing, cracking, or failing during the winter months.
• Inner drain strainers help keep debris from clogging the drain pipes and can be custom-made to fit your roof and regional climate.

Some essential issues to take into consideration are:

• A small amount of debris can render the strainers ineffective, clog the system, and cause water to pool on your roof.
• Verify the appropriate number of drains for the size of your roof. Too few drains and the system could easily be overloaded, causing water to back up and pool on your roof.
• Inner drains are more expensive to maintain. These drains require a specialized technician to service, clean, and maintain them.
• Of the three drain systems presented here, inner drains are the most expensive to install.

Rain Gutters – With the ability to serve all types of roofing systems, rain gutters together with downspouts are the most common type of water drainage system in use. Gutters offer the following benefits:

• The system is inexpensive
• Easy to install
• Effectively controls the flow of watershed from a roofing system
• Shields doorways, vents, and windows
• Keeps water from pooling near the building

Some essential issues to take into consideration are:

• Gutters require maintenance and cleaning year-round
• Gutters are prone to becoming brittle and cracking
• Gutter brackets may come loose or give way under excessive water or leaf weight
• In winter, ice dams can cause cracking
• Downspouts may clog causing water to back up and overflow in the gutter

Scuppers – This drainage system consists of along the outer walls (curbs) along the roofline. Water passes through a metal box that surrounds and protects the scupper. Consider the following benefits:

• Installation of the drainage system is extremely low cost
• If designed wide enough, there is virtually no clogging
• Water is propelled away from the building
• Custom scuppers can add to the building’s architectural appeal
• This draining system is almost maintenance-free

When the design and installation of scuppers are carried out correctly, the system provides the best value of the different drainage systems. Thus, scuppers are preferred for the efficient draining of water from your flat roof system.

The only issue with scuppers is when they are attached to downspouts or gutters, which may clog – scuppers function best when unattached from other systems.

Roof Load and Water Weight

Water removal from your roofing system is of supreme importance. As water pools and rises, it adds weight to your roof’s load and can cause a catastrophic roofing system failure.

A gallon of water weighs 8.34 pounds. During a rainstorm that drops a half-inch of rain, 300 gallons of water can accumulate on a 1,000 square foot roof. That is an additional 2,502 pounds added to your roof’s load.

To calculate rainfall accumulation or runoff, use the following equation:

1) Convert the footprint of your roof to inches. A 50’ by 50’ roof would be 600” by 600.”

2) Multiply the square footage of the roof (600” X 600” = 360,000”) by the number of inches of rainfall .5” for this example which equals 180,000

3) Divide the number by 231 to get the number of gallons (231 cubic inches = 1 gallon). In this case, 180,000 divided by 231 equals 779.22

4) 780 gallons of water weighs about 6,500 pounds, potentially added to your roof.

In this example, we see the potential for a roofing system partial or total failure due to an exceeded load capacity. To learn more about commercial roof loads, read atlantacommercialroofingcontractors.com/what-is-commercial-roof-load-why-you-need-to-know/

Commercial Roof Drainage Systems

In this article, you discovered information about three types of water drainage systems for commercial roofs and the impact that pooling water can have on your roof load.

By installing a drainage system that facilitates water runoff from your roof, you are extending the life of your roof and making the building a safer place to be.

If you fail to provide adequate drainage or regular maintenance to keep your systems working properly, the structural integrity of the roof, building, and its occupants are at risk.

Sources:
http://www.ashireporter.org/HomeInspection/Articles/Flat-Roof-Drainage/2554
citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.359.7775&rep=rep1&type=pdf
digitalcommons.calpoly.edu/cgi/viewcontent.cgi?referer=&httpsredir=1&article=1069&context=aen_fac
sciencenotes.org/much-gallon-water-weigh-easy-calculation/

See 3 Commercial Roof Water Drainage Systems for the first version of this content.

Is TPO the best flat roof system for your property? This question is frequently asked by property owners that need a new roof, and we have the answer.

As a relative newcomer to the roofing materials industry, TPO roofing systems have gained extraordinary popularity and are being used throughout the United States. Due to its durability and cost efficiency, TPO should be considered when re-roofing or installing a new roofing system.

atlantacommercialroofingcontractors.com takes an in-depth look at the definition, installation, warranty, cost, and problems associated with TPO roofing systems while answering some of the most frequently asked questions about it.

TPO Roofing Explained – Production, Properties, and Benefits

TPO is Thermoplastic Polyolefin, and it is one of several single-ply roofing systems.

The following will help you understand the composition, properties, and production of TPO membranes for both commercial and residential structures.

• A TPO membrane may be produced by calendering with lamination (this is the process of combining materials at high heat and pressure by passing them through rollers), extrusion with lamination (a process to make long shapes with constant cross sections, similar to squeezing toothpaste from a tube), or through extrusion-coating techniques.
• Sheet thickness is usually 40 mils to 100 mils. That’s about the thickness of a heavy duty trash bag.
• Sheets are typically produced in widths ranging from 6 feet to 12 feet.
• The composition of TPO sheets is a blend of polypropylene, ethylene propylene polymers, and polyester reinforcement.
• Overlapping seams are sealed by heat welding which uses hot air.
• The majority of TPO membranes are white but can come in a variety of colors.
• TPO roofing is resistant to oils and chemicals carried by commercial exhaust vents.
• TPO roofing material contains flame retardants and UV absorbing elements.
• TPO roofing systems receive high wind ratings when properly installed.
• TPO roofing has a life expectancy of about 30 years, however, only having been in use for three decades, its full potential lifespan is still being evaluated. As time passes, production of the system and its method of installation have naturally worked out the bugs, thus improving the product and increasing its longevity.

TPO Roofing Installation and Warranty

The installation of a TPO roofing system, when done by an experienced roofing company, is fast, clean, and virtually nonintrusive.

How your roofing system is installed will determine its ability to withstand the elements and ultimately its lifespan.

Affixing the TPO membrane is accomplished by making it fully adhered, and mechanically attached or ballasted; the following factors greatly influence the quality of the roofing system’s installation:

• Proper roof slope for a efficient draining.
• Strategic installation and fastening of insulation (when used) to deter bulging or sagging.
• Proper application of adhesives.
• Proper use of a seam welder (to prevent future leaks in the seams).
• All welds checked using a seam probe.
• Drip edge seamlessly connected around the perimeter of the roof.

In addition to a quality installation, a strong warranty is advantageous and very valuable. There are two warranties to consider when installing any new roofing system:

Manufacturer’s Warranty – This warranty covers manufacturing defects in the material used for your roofing system. Once the installation is complete, your contractor should provide you with a warranty certificate.

An example of material failure would be the separation of the lamination from the TPO membrane during hot weather. Unless it is determined to be a result of faulty installation, a claim should be made against the manufacturer’s warranty.

Contractor’s Warranty – This warranty covers the workmanship and installation of your roofing system.

While there is no industry standard for the duration of a contractor’s warranty, it should contain the following:

• A list of what items are covered.
• What actions or situations would void the warranty.
• When the warranty expires.

The above installation and warranty information underscore the necessity to thoroughly vet contractors.

TPO Roofing Cost

Pricing any roofing system can be a daunting experience. Often there is a significant disparity from one quote to the next, validating the need to collect a minimum of three bids from reputable roofing contractors.

Prices for installing a TPO roof system will vary depending on the time of year, brand, quality of the materials, method of installation, and the amount of labor involved. You can expect to see price quotes in the following ranges:

Tear-off costs can run between $100 and $200 per square. In some cases, the contractor will bundle this into material and installation pricing.

A tear-off is when the existing roofing system is completely removed to install a new system. Depending on the type of roofing system being installed and the condition of the existing roof, the new system may be installed over the existing one.

TPO material will see a price range between $150 and $500 per square.

TPO installation labor costs will range from $500 and $900 per square.

Maintenance contract pricing varies from contractor to contractor.

Roofers and their suppliers price materials in terms of ‘squares,’ whereas
1 square = 100 square feet.

So as an example, the price range of the bids you receive, including tear-off, material, and installation for a 1,000 square foot roof may fall within $7,500 to $16,000.

Note: Across the industry, roofing installations are more expensive in the spring and summer time. To save money, try to schedule an installation for the off-peak season (early spring and fall).

TPO Roofing Problems

The majority of problems that arise with TPO roofing systems occur as a result of poor installation.

Here are some commonly reported issues:

• Roof slope is too low, resulting in pooling water. (which degrades materials faster)
• Insulation (under the membrane) not installed correctly and is causing bulges.
• Seam separation from improper welding, allowing water penetration.
• Torn membrane from debris striking the roof.

For proper installation, it is essential to hire a roofing company that has extensive training and experience with TPO roofing systems.

People Also Ask

Question: Is TPO better than EPDM?
Answer: Inconclusive. Depending on which aspect of the two roofing systems you wish to compare, and your roofing requirements, the answer may vary.

While EPDM and TPO offer very similar benefits, TPO with its stronger and more durable seams (adhered to the roof), make it a desirable option.

Question: What is the difference between PVC and TPO?
Answer: Visually, the two roofing systems are virtually identical.

Performance-based, the two systems produce similar results until puncture resistance, environmental impact, and eventual “known” problems are taken into account. In this scenario, the TPO system is a superior option. However, when price and warranty terms are considered, PVC edges out TPO. Both are great products that check different boxes and satisfy different needs.

Question: How long has TPO roofing been around?
Answer: Since 1989.

Question: What colors does TPO roofing come in?
Answer: Standard colors are white, tan, and grey. However, TPO can be found in different shades of grey, brown, green, red, tan, and gold.

Question: Is TPO roofing flammable?
Answer: Yes. However, as with all roofing systems, TPO roofing is required to meet FM and UL fire ratings.

A distinct difference and advantage of TPO is that it does not release dioxins when burned and contains flame retardants.

TPO Information Revealed

When being presented options and quotes for new roofing systems, property owners frequently ask “What is TPO?” As you’ve discovered, it’s one of the most popular thermoplastic roof membranes in today’s roofing industry.

In this article, you were presented valuable information about the installation, warranty, cost, life expectancy, problems associated with TPO roofing systems, and answers to frequently asked questions.

By asking the right questions and being informed when selecting a roofing system and the contractor to install it, you will benefit from getting the best roofing solution and warranty at the best available price.

Sources:
http://www.everybodyneedsaroof.com/thermoplastic-membranes
http://mrca.org/aws/MRCA/asset_manager/get_file/161617?ver=344
http://firestonebp.ca/roofing/tpo-roofing-systems/tpo-installation-methods/
http://www.nrca.net/
http://www.azsfb.gov/sfb/Performance%20Specifications/Roofing%2009202018/07%2054%2023%20-%20TPO.pdf

See TPO Roofing System Explained for the first version of this content.

Do you know the blatant and hidden roofing job signs most likely leading to expensive repairs and/or roof failure? Most roofers won’t tell you about these common mistakes, but we will.

For the investment that a new roof requires, you would like to be able to expect a complete and mistake free installation. Avoid the expensive surprises and premature roof failure by knowing what to look for and can go wrong.

atlantacommercialroofingcontractors.com gathered a list of the 15 more common mistakes roofers make during the installation process.

Mismatched Roofing Shingles

One of the more visible mistakes a roofer can make is to use mismatched shingles. This obvious mistake occurs when a roofing contractor uses multiple dealers and purchases supplies from more than one supplier.

This can be avoided by selecting a roofing contractor that consistently uses the same roofing supplies distributor.

Layers of Shingles

Depending on the municipality your property is located in, it may or may not be unlawful to install a new roofing system without first tearing off the old one.

By tearing off the old roofing system, your contractor can fully inspect your roof deck for any weaknesses, gaps, and other potential issues. An added benefit is that your roof deck will not have to support the weight of two systems.

On the contrary, some commercial roofing systems are engineered to overlay an existing roofing system. Before this happens, the number of layers is checked and decking is tested for it soundness.

This cost-savings method prevents a complete tear-off and related debris hauling process, but should only be used on a commercial roofing system and in accordance with all local and state laws.

Incorrect Use of Roofing Nails

Roofing systems that utilize nails to secure it to the roof deck have specific guidelines for the size and use of nails. The following are common mistakes that could lead to your insurance company refusing to pay a claim in the event of roof failure.

• Nails without barbed shanks.
• Nails are too short.
• Nail Heads are too small.
• Not enough nails used. (the average is four per shingle and six for higher slopes or premium installations)
• Nails driven above the self-sealing strip.
• Nails driven into knotholes or gaps in the roof deck.

All of the above can result in the acceleration of a roof’s deterioration.

Incorrect Shingle Overhang at the Eves

Shingle overhang at the eaves should be between 6 and 10mm. More than this can result in the shingles being blown off during high winds or severe storms. Less than 6mm can result in water infiltration of the roof deck and leaks within the structure.

This mistake can be avoided by proper shingle installation and with the addition of a drip edge flashing to protect the edges of the deck from water infiltration. This flashing can be secured with a shingle adhesive.

Neglecting the Installation or Reusing the Drip Edge Flashing

Drip edge flashings help ensure a roof’s success at keeping the outside elements outside. Here are some of the benefits:

• Stops wind-driven rain from gaining access at the edge of the roof.
• Provides a surface for water to drip from which prevents saturation and decay of the deck or fascia board
• Drip edge flashings stop insects from entering the attic.
• Since they extend slightly past the edge of the roof, they support and keep shingles from sagging or breaking.

When replacing your roofing system, ensure that all drip edge flashings are replaced. This expense is minimal considering the cost of a new roof, and serves to protect your investment.

Improper or Missing Starter Shingles (Starter Strips)

Both rookie contractors and do-it-yourselfers frequently make this mistake. A starter section of shingles should be laid along the eves.

Without starter shingles, water will make its way to the roof deck through the cutouts of the bottom shingles.

Improper Installation of Underlayment

Roofing underlayment is a layer of water-resistant or waterproofed material that is installed directly onto your roof deck. The underlayment is applied under all other roofing materials as an added layer of protection from severe weather and the elements.

There are three principal types of roofing underlayment:

• Asphalt-saturated felt
• Non-bitumen synthetic underlayment, or synthetic underlayment.
• Rubberized asphalt underlayment

Asphalt-saturated felt, and synthetic underlayment are both water-resistant, while rubberized asphalt underlayment is waterproof.

Neglecting the Attic

Your roof is a system made up of various parts, including the attic space. Without proper attic ventilation, moisture can build up over time causing your roofing system to prematurely wear out, and ruining your insulation, resulting in sharp increases in your energy bill.

Improper Roof Slope

The use of materials that don’t suit the slope of your roof will leave your structure susceptible to water penetration.

As an example: For an installation of asphalt, wood, or tile shingle roofing systems, it is recommended to have 4 units rise per 12 units of run.

Roof Gutter Sag

Roof gutters are vital to guiding water away from your roof. When they sag, come loose, are installed too low, or do not sufficiently slope, they can back up or overflow, allowing water to enter the structure.

Insufficient Securing of Roof Valley Flashing

Since roof valleys typically handle large volumes of water runoff, they are more prone to leaks. When roof valley flashings are improperly installed, the roofing system can buckle, leading to water leaks and costly repairs.

In addition to the proper installation of roof valley flashing, using the appropriate amount of sealant and adhesive material will work to prevent water penetration.

Not Planning for Ice Dams

In colder climates, ice dams form at the roofline which forces water under the shingles. Thawing and refreezing can wreak havoc on a roofing system without proper insulation.

Damage can be significantly reduced or prevented by applying an additional underlayment from the roofline to about three to four feet up the roof. This provides an extra layer of protection from melting ice water.

Ignoring the Manufacturer’s Guidelines

Roofing manufacturers have detailed regulations on how their roofing systems must be installed. Deviations from these regulations may determine whether a manufacturer will honor their warranty in the event of the roof’s failure before the guaranteed lifespan.

Skipping the Roofing Permit

Most municipalities require a permit for new roof installation. The building owner or property owner is ultimately the one held liable for failing to obtain a permit.

Having a roof installed without a permit may result in fines, refusal of insurance coverage, or even the forced complete removal of the new roof.

Insufficient Roofing Contractor Insurance

If your contractor does not carry enough insurance to pay for damages or injuries, you may be held responsible for covering these costs.

All reputable roofing contractors will willingly provide proof of their insurance policy. Likewise, their insurance company may be contacted to confirm their coverages.

Avoid a Bad Roofing Job

Knowing the signs of a lousy roofing job and contractor will help you avoid expensive surprises and premature roof failure.

In this article, you discovered 15 of the most common roofing mistakes that can lead to leaks, weather damages, and roof failure.

If you don’t know what to watch for during the installation of your new roof, you are leaving too many windows for mistakes that can cause serious damages to your property and potentially result in the failure or loss of your new roof.

Sources:
https://www.fema.gov/media-library-data/20130726-1706-25045-9347/chapter8.pdf
https://dopl.utah.gov/licensing/contracting_avoid_costly_mistakes.html
http://www.ashireporter.org/homeinspection/articles/don-t-miss-the-shingle-stagger-/1973
https://www.handymantips.org/major-roofing-mistakes/

See 15 Common Mistakes Most Roofers Won’t Tell You About for the first version of this content.