A roof membrane is necessary for commercial or flat roofs to effectively move water off their surface and prevent leaks. A popular commercial roof membrane is modified bitumen, and building owners swear by its excellent features.
Kirtley and Sons Roofing, home of the leading roofing contractors, discusses what modified bitumen is and the two available types.
Modified Bitumen
Modified bitumen is used in commercial roofs as a protective membrane. It is composed of multiple reinforcing layers for maximum leak prevention and less heat gain. There are two types of modified bitumen available: APP and SBS.
APP (Atactic Polypropylene)
APP Polymer Modified Bitumen is a plastic-based asphalt that increases a commercial roof’s ultraviolet (UV) resistance and improves its flexibility and flow resistance in both low and high temperatures. Heat is usually applied to this type of modified bitumen to soften it and create a molten adhesive at the bottom. When this cools, it makes the adhesive bond waterproof.
SBS (Styrene-Butadiene-Styrene)
The SBS polymer modified bitumen was created for areas with low temperatures to avoid asphalt frost cracking. It has rubber-like characteristics with impressive resistance to deterioration and weathering, making the need for emergency roofing service a thing of the past.
They are usually installed in hot asphalt like the BUR system or using cold adhesive. You can also have this layer contain an adhesive backing for quicker installation.
Kirtley and Sons Roofing can guarantee exceptional roof repair service, and we deliver it with satisfying results. Call us today at (281) 370-8484, or fill out our contact form to request a free project estimate. We serve residents in Cypress, TX, and other nearby areas.
