The information in this document is provided for a better understanding of the science and physics of how buildings work so that we may make them work better, providing more stable, durable and efficient buildings. This document is NOT intended to support a particular product or company.

Spray-in-place polyisocyanurate (polyurethane) foam is a high performance building material. Spray foam is primarily used as an insulation material. When installed, the foam expands in place and fills in around plumbing, wiring and other obstructions in the framing. For this reason alone, the author looks at how spray foam may outperform batt insulation.


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  • 28 January 2014 Creation Date
  • 25 September 2019 Last Updated