TL;DR
Modified bitumen is an asphalt roofing membrane reinforced with polyester or fiberglass and modified with polymers — APP for plastic stiffness or SBS for rubber-like flex — installed in rolls by torch, hot mop, cold adhesive, or self-adhered sheets. It suits low-slope residential roofs over porches and additions, typically in two plies with a granulated cap sheet, lasting 15 to 25 years.
What it means
Modified bitumen is an asphalt roofing membrane reinforced with polyester or fiberglass and modified with polymers — APP for plastic stiffness or SBS for rubber-like flex — installed in rolls by torch, hot mop, cold adhesive, or self-adhered sheets. It suits low-slope residential roofs over porches and additions, typically in two plies with a granulated cap sheet, lasting 15 to 25 years. Granule loss and open laps at the seams are its telltale aging signs during roof inspections.
Where it sits in the glossary
Modified bitumen is part of the Trade jargon group inside the ProFix Directory glossary. Browse every term in this category from the glossary index.
Why Ohio homeowners should know it
This is a term Ohio homeowners encounter when reading contractor quotes, hiring paperwork, or inspection reports. Understanding it well enough to ask one good follow-up question is usually all the protection a homeowner needs.
ProFix Directory keeps definitions short on the index page and saves the longer context — Ohio-specific rules, where the term comes from, and which ProFix tools touch it — for these per-term pages so the term is easy to cite and easy to share.
ProFix tools that touch this term
See also
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