Versi-Block is the newest product to join the Versi-Tite product line. It is a one component polyurethane foam sealant that inhibits the passage of smoke through residential utility penetrations. It is bright orange in color to allow for inspectors easy identification of an approved fire block. This innovative low pressure low expansion formula creates a durable, airtight, and waterproof seal that stops air infiltration and provides high insulation value.
Versi-Block has been tested according to ASTM E814 (modified), NFPA 268, and meets the requirements for fire blocking penetrations around wires, pipes, ducts, and other penetrating items in single family residential construction. It is ICC rated and tested. The foam is considered flame retardant, with an ASTM E814 flame spread rating of 15 and a smoke developed index of 20. It is a Type V Residential Fire Block. This means it has been tested and approved for use in "non-rated" single family construction only.
It is not to be used as a fire stop in commercial applications or intended for use in hourly rated assemblies. A fire stop is a caulking product that provides 1 to 2 hour fire ratings. Fire stops are required in hospitals, multi-housing units, and commercial buildings.