Retrofit: How do we tie-in existing footers and sill plate to an insulated plywood slab on grade? - GreenBuildingAdvisor
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We hope to put a concrete-free floating ply floor in our slightly below grade walkout basement. Our contractors are not experienced with this floor, and we would like to provide […]
Retrofit: How do we tie-in existing footers and sill plate to an insulated plywood slab on grade? green_with_envy | Posted in Energy Efficiency and Durability on March 29, 2026 04:37pm We hope to put a concrete-free floating ply floor in our slightly below grade walkout basement. Our contractors are not experienced with this floor, and we would like to provide clear simple information on the wall/floor interface. Contractor is especially concerned about:1. how to bolt or screw down to secure exterior walls to footings without compromising the insulation and vapor barrier and 2. How to secure interior wall framing to floors with only 1.5” of ply 3. how to level sill plates where we have rough old strip footers. Are these concerns solvable? Wr’d be grateful for any advice, articles, or diagrams for a retrofit situation. Answer GBA Detail Library A collection of one thousand construction details organized by climate and house part Search and download construction details Join the leading community of building science experts Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field. Start free trial Replies Log in or create an account to post an answer. Sign up Log in
