Architecture Blog

Information, education, inspiration, ideas, events, commentary, etc related to architecture.

Vapour Barriers: Alternatives to Polyethylene

We are often asked by clients, builders, and trades where is the poyethylene sheet vapour barrier in that wall assembly?   Links to two SAB Magazine blogs by Mike Reynolds, a former home builder, a LEED for Homes Green Rater and the editor of that provides a concise explanation of the alternatives and why polyethylene may not be the best choice, especially for high performance building envelopes.

Vapour Barrier Ideas - Try Mounting OSB on the Inside

Build a Poly Free House - Just Paint on Your Vapour Barrier


Air and vapour sealing on the inside face of the exterior wall.  A second 2x4 wall is provided for running building services to avoid penetrations in order to achieve incredibly low building envelope air changes.

Common use of OSB on the inside fce of the exterior wall in a 2 wall Passive House system.

Vapour Barrier Paint Primer

Vapour Barrier Paint Primer