Modified bitumen is a durable roofing system option for flat roofs. It is flexible; expanding and contracting with temperatures, while maintaining weather resistance. It is easy to repair and install. It does not have gravel surfacing – making maintenance and repairs a much easier task. Although its surface typically does not require coating (reduced maintenance costs), an addition of coating may add years to the lifespan of the roofing system.
In the current manufacturing process of modified bitumen, there are two main modifiers that are added: APP (attactic polypropylene) and SBS (styrene-butadiene-styrene), increasing the flexibility and aging ability of the membrane, respectively.
Modified Bitumen is a long standing product in the commercial roofing market. MODBIT, when properly installed, can be an excellent roofing system providing years of performance. However, poor and inconsistent installation methods can often result in poor performance. MODBIT may see failure due to its susceptibility to hail, blistering from poor installation, and deterioration of the material due to ponding water.
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