Materials
What is Modified Bitumen?
Roofing Glossary · Materials
Definition
A factory-reinforced asphalt roofing membrane modified with APP (atactic polypropylene) or SBS (styrene-butadiene-styrene) polymers to improve flexibility, temperature resistance, and elongation. Used on low-slope roofs, modified bitumen is installed in two plies — a base sheet and a cap sheet — using torch application, cold adhesive, or self-adhering methods. It is more durable than traditional built-up roofing and easier to install than EPDM.
Related Roofing Terms
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Built-Up RoofA traditional flat or low-slope roofing system (BUR) consisting of multiple alternating layers of bi...
→TPOThermoplastic Polyolefin — a single-ply white or light-colored roofing membrane widely used on low-s...
→EPDMEthylene Propylene Diene Monomer — a synthetic rubber roofing membrane available in black or white, ...
→Membrane FailureThe degradation or rupture of a flat or low-slope roofing membrane system resulting in water infiltr...
→PondingThe accumulation of standing water on a flat or low-slope roof surface that remains for more than 48...
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