| abstract |
An asphaltic sheet comprising an asphaltic component including an asphalt binder and expandable graphite, and optionally a polymer modifier complementary flame retardant dispersed within the asphalt binder. These sheet materials are useful as roofing underlayment, as roofing membranes, and as barrier materials such as air, vapor, and/or moisture barriers, modifier complementary flame retardant dispersed within the asphalt binder. |