Insulation that expands or comes in rigid boards to fill gaps and provide high R-value per inch.
Foam insulation includes spray polyurethane foam (SPF) and rigid foam board products used to insulate walls, roofs, and foundations. Open-cell spray foam provides R-3.5 to R-4 per inch; closed-cell spray foam provides R-6 to R-7 per inch. Foam insulation also provides air sealing and, in some configurations, vapor control.
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