Handi-Foam Spray Foam Fire Block is the most economical, convenient and effective method for installing Building Code mandated Fire blocking in wood frame residential construction. Handi-Foam Fireblock is used to seal concealed penetrations from floor to floor or room to room in order to prevent or delay the spread of smoke and flame. Fireblock foam is an easy to install expanding One-Component Polyurethane Spray Foam Fire Block Sealant which passes ICC-ES evaluation as a Type V residential fire blocking product.