Great Stuff Fireblock Insulating Foam Sealant

Great Stuff Fireblock Insulating Foam Sealant is a premium, fire-resistant expanding polyurethane foam designed to seal, insulate, and slow the spread of flames and smoke in residential and commercial buildings. This bright orange foam fills gaps and cracks up to 1 inch wide, creating an effective barrier that enhances both fire safety and energy efficiency. It’s ideal for use in concealed spaces such as wall cavities, attics, basements, and crawl spaces, helping to block air movement and improve building performance. Fireblock foam meets ASTM E84 standards for fire-blocking and is recognized by building codes for use in non-rated construction. Once applied, it expands to form a durable, airtight seal that resists moisture, drafts, and pests. After curing, it can be cut, sanded, painted, or stained for a clean finish. Great Stuff Fireblock is trusted by builders, contractors, and homeowners for its proven reliability in providing both insulation and fire-resistant protection in critical areas.