SPF and the Need for Vapor Retarders in Above-Grade Residential Walls

SPF and the Need for Vapor Retarders in Above-Grade Residential Walls

By John Straube, Ph.D., P.Eng. Download pdf (712 KB) This short report summarizes research conducted by John Straube, Rachel Smith, and Graham Finch for the Canadian Urethane Foam Contractors Association (CUFCA). The full report is available at buildingscience.com. The Question: Theory and experience suggest that closed-cell spray polyurethane foam (ccSPF) is sufficiently vapor impermeable to […]

Spray Polyurethane Foam: The Need for Vapor Retarders in Above‐Grade Residential Walls

Spray Polyurethane Foam: The Need for Vapor Retarders in Above‐Grade Residential Walls

By: John Straube, Rachel Smith, and Graham Finch. Abstract: A common question encountered by SPF applicators, building designers, and code officials is the need for an additional vapor barrier or retarder. Experience by many contractors and some consultants suggest that special low permeance layers such as polyethylene are rarely needed in many types of walls. […]

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