When a fire ignites, it spreads by air movement between rooms, through unsealed penetrations in the walls and lumber. Building codes require the use of a draft stopping sealant in these spots, to reduce the potential spread of fire and help isolate flames to a single room. Fire Block Extreme is the perfect solution. Engineered to seal with a single application in temperatures as low as -4°, Fire Block Extreme is our most popular fire block foam, designed to work well with our Extreme Temp window & door foam, in locations requiring the orange color for easy identification by inspectors. BENEFITS * Type V residential fire block * Works well between -4°F and 100°F (-20°C and 38°C) * Works well at any humidity level * High-yield formula APPLICATIONS * Sealing air leaks between floors and walls as required by building code STANDARDS & APPROVALS * UL classified * ICC-ES Report ESR-3302 * ASTMC1620 * ASTM E814 (modified) * NFPA 286 * ASTM E84