Spray foam insulation or spray polyurethane foam (SPF) is an alternative to traditional building insulation such as fiberglass. A two-component mixture composed of isocyanate and polyol resin comes together at the tip of a gun, and forms an expanding foam that is sprayed onto roof tiles, concrete slabs, into wall cavities, or through holes drilled in into a cavity of a finished wall.

“Spray foam” is also an informal term used to refer to various plastic foam materials that are used in building construction to provide thermal insulation and minimize air infiltrationPolyurethane and polyisocyanurate are two types of foam used in this application.

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