Can I use NCFI spray polyurethane to insulate an existing building?
Spray polyurethane insulation is used primarily to insulate new buildings or structures. This is because spray polyurethane must be applied to an open cavity. When spray polyurethane is injected into a closed wall cavity, the pressure of the expanding insulation may damage the wall. Consider insulating an existing building with spray polyurethane when you’re replacing the exterior siding or doing other major remodeling.
