What makes spray foam insulation effective?
Spray polyurethane foam is effective in air sealing and insulating because it is applied as a liquid and expands in seconds to multiple times its original liquid size. As it expands, it fills cavities and voids to create a sealed thermal envelope. It creates a highly-effective seal against air infiltration, the number one source of energy loss in a structure. This insulation adheres to any clean, dry surface and will not sag or settle.
