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Understanding The Pros And Cons Of Modified Bitumen Roofing

Arliegh Boswell • Apr 24, 2022

Modified bitumen or mod bit is a widely used, long-lasting, single-ply roofing solution for low-sloped or flat roofs, commercial and residential. Modified bitumen is an asphalt-based product. Manufacturers make modified bitumen roofing by combining hot asphalt with polymerized rubber or plastic additive and reinforcing it with fiberglass. It results in a flexible and waterproof roofing membrane.


Roofers install modified bitumen roofing in multiple layers for better efficiency and effectiveness. If you are considering modified bitumen roofing for a new flat roof or the existing one, it is wise to understand its pros and cons before making the final decision. This article highlights the benefits and drawbacks of using mod bit roofs for your commercial roofing project.


Modified Bitumen Roofing Pros

Durable 

Modified bitumen is among the most trusted roofing systems. It can withstand high foot traffic. It comes with high-tensile strength and is not prone to cracks and tears like other membrane roofs. Bitumen modified roofing is highly resistant to fire (class A fire rated), wind, UV rays, hail, and storms, which helps protect it from damage. It also comes with a lengthy manufacturer warranty. 


Lowers carbon footprint

Mod bit roofs resist heat and UV rays when installed in lighter colors and reflective top coating. It keeps the indoor spaces cold and comfortable. Choose Energy Star-approved system and hire a licensed roofer for installation for more energy savings. Some modified bitumen roofing materials are recyclable and reduce the amount of waste going to the landfill. 


Easy application and repair

There are different ways to apply mod bit roofing, self-adhesive, cold-adhesive, and hot mopping. Application is easy and convenient, and roofers can pick the most suitable method. Peel-and-stick is a DIY-friendly method. Mod bit roofs come in rolls, and the ease of application keeps the costs down. The repairs and maintenance are also less of a hassle. 


High-performance in cold weather

A popular advantage of modified bitumen roofing is its performance in cold conditions as it remains flexible. It has high resistance to cold temperatures and can withstand low temperatures, even below freezing, without breaking or developing cracks. 


Excellent seal

A modified bitumen roofing offers a good seal regardless of the installation method. It ensures no seams and makes the roof more resistant to leaks. The seams in other membrane roofing are prone to weaken over time.


Modified Bitumen Roofing Cons

Susceptibility to water pooling

Though waterproof, modified bitumen roofing is more vulnerable to water pooling if it doesn’t have an excellent drainage system. Stagnant water after a rainstorm leads to deterioration, damage, and premature aging of the roofing system. To prevent this, ensure a proper drainage system while installing the roof. Also, as it seals perfectly, leaks are harder to detect.


Heat absorption during summer

Another drawback of modified bitumen roofing is heat absorption. Black modified bitumen roofing does not reflect heat, and lack of proper insulation can cause the interiors to get hot. Mod bit roofs are available in lighter but more expensive colors.


Short life expectancy

Modified bitumen roofing lifespan is lower than other roofing materials. It lasts 10-20 years and can start to show signs of wear and tear after 10 years. The quality of installation also affects the longevity of this type of roof. Always hire a professional roofing company for installation.


Foul odor

The installation of modified bitumen roofing leaves an unpleasant, lingering odor. It is best to relocate during roof installation.


Cost

Modified bitumen roofs come in one, two, or three-ply systems. Though inexpensive, the 1-ply material does not offer good durability and is likely to break down prematurely. Two or three-ply systems are durable but drive up the cost significantly. 

Correct installation and proper maintenance are the keys to a lasting modified bitumen roofing system. If you think modified bitumen is the right choice for your commercial building, contact a local commercial roofing company to ensure the correct installation.

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