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Interior wall sheathing options – GreenBuildingAdvisor
- September 10, 2026
- Posted by: sherwin@eyeconz.com
- Category: Uncategorized
My question is about the suitability for 3/4″ maple or similar plywood for the interior cladding of the exterior walls for a cabin in climate zone 7. No walls require drywall for fire code related reasons. I would like to do plywood to add stability (high winds exposure), because I enjoy it more than drywall, and because I don’t have to tape, mud, and sand it in place. There are many options to deal with the seams. Specifically, I am wondering about the vapour ramifications? My wall from exterior to interior is: Hardie Board & Batten, 3/4″ spruce furring strips & Coravent for rainscreen gap, 1.5″ Rockwool Comfortboard 110, regular Tyvek house wrap, 1/2″ exterior grade plywood sheathing, 2×6 stud wall insulated with 2×6 Rockwool batts, Certainteed Membrain vapour retarder. The next layer would normally be the drywall. Considering that 3/4″ dry plywood has a vapour permeance rating under 1 perm, am I setting the wall up to trap moisture between the plywood and the Certainteed Membrane vapour retarder layer? Thanks in advance for any advice.
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