Modified Bitumen Commercial Roofing Systems

Since the 1970s, modified bitumen has been one of the most popular choices for commercial roofs. Even to this day, modified bitumen is widely used in applications for flat and low-sloped roofs, despite the number of different single ply roofing systems that are currently available.

What Is Modified Bitumen?

Modified bitumen is basically an asphalt roof with some modifications. Also referred to as a “tar-and-gravel” roof, modified bitumen offers the same advantages of other built-up roofing systems. Modified bitumen is typically made of polymer modified bitumen that is reinforced with some tough layers of fabric. The fabric layers can be polyester, fiberglass, or a combination of the two.

Traditionally, modified bitumen comes in sheets that are rolled out across the roof during installation. Speaking of installation, modified bitumen is often “torched-down” when it is installed. This method involves using a propane torch to heat up the modified bitumen in order for it to adhere to the roof’s surface. You can also install a modified bitumen roof using adhesives rather than a propane torch; however, the “torch-down” method has many installation advantages, including water resistance.

Advantages Of A Modified Bitumen Roof

Perhaps the biggest advantage of a modified bitumen roof is its durability. Often lasting well over 20 years, modified bitumen roofs are easily one of the most durable and long-lasting applications for commercial flat roofing systems. Due to its high-tensile strength, modified bitumen is also resilient to damage over time, especially cracks that other flat roofing materials are known for.

Another advantage, one that is particularly useful here in Florida, is bitumen’s resilience to high winds, hail, rain, and fire. Florida experiences some especially nasty thunderstorms, and every now and again, a hurricane will come through our area. Modified bitumen does well in high winds compared to other flat roof materials, and it’s one of the most waterproof materials, especially if the “torch-down” method is used during installation. If you choose a modified bitumen for your commercial roof, you’re getting a roof that’s proven well over time to withstand Florida’s harsh weather conditions.

Modified bitumen is also very cost effective to maintain. Since the asphalt used is often recycled, repairs are typically very affordable, and it’s also a great material if you’re looking for something that’s more energy-efficient. As the top layer can be treated to reflect some Florida sun, you may be able to reduce your monthly energy costs if you choose modified bitumen.

Disadvantages Of A Modified Bitumen Roof

Like all flat roofs, a modified bitumen roof may gather puddles of standing water after a rainstorm. If your drains ever get clogged or if the modified bitumen roof  was not installed properly, standing water can pool very easily, which can prematurely age and damage any bitumen roof.

Whether you’re installing a new modified bitumen roof or having roof repairs completed, our roofing division welcomes the opportunity to serve your commercial roofing needs. Contact our office today for a complimentary quote!