The sprayed polyurethane foam resulting from passes of foam in a specific area. A lift is defined by its thickness and the area. For example, a one inch lift of foam was installed to a 20 x 20 ft area, and then a second lift of foam 1.5 inch thick was installed to the same area.
See also: PASS
SPFA believes that the path to a healthful, safe, high-quality and performing SPF installation travels through the hands of a knowledgeable, trained, experienced, and ideally PCP-certified professional contractor.