Transcription of Maximum Thickness Restrictions For Spray Foam
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The Monthly Newsletter on Energy-Efficient Housing Electronically reprinted from Vol. 28, No. 4 April 2008. Maximum Thickness Restrictions For Spray foam Most contractors and building inspectors appear to 6 inches Maximum in ESR-1383 (BioBased 501), be unaware that the technical specifications for Spray 2 inches Maximum in ESR-1615 (Insulstar), polyurethane foam (SPF) products often include maxi- 6 inches Maximum in ESR-1172 (Sealection 500), but mum Thickness limitations. Since buildings insu- only inches Maximum for attic walls, lated with the listed Maximum Thickness of Spray inches Maximum in NER-420 (Icynene), but foam often fail to meet minimum prescriptive R-value 6 inches in certain attic constructions, requirements, builders who learn of these limitations 2 inches Maximum in ER-3974 (Froth-Pak).
The ICC-ES report for Insulstar spray foam from NCFI (ESR-1615, issued February 1, 2005) lists a maximum thickness of only 2 inches: “Insulstar Spray Foam Insulation is a spray-applied, semi-rigid, cellular polyurethane foam plastic insulation having a maximum thickness of 2 inches and a nominal density of 2.0 pcf.”
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