Single family home, 20 year old slab on grade, 3/4" plywood sub-floor fastened to the concrete slab using concrete nails, solid red oak hardwood nailed to the plywood, site sanded and finished. No concrete slab moisture tests taken, no moisture barrier installed between concrete slab and plywood. Within weeks, moisture transferred from ground to concrete to plywood to hardwood causing expansion, cupping and ultimately the need for full replacement of the new sub-floor and floor covering. There are no guarantees that the vapor barrier installed beneath a slab, during original construction, is still intact (or was even installed in the first place). Recommendations: 1. Float the plywood sub-floor. 2. Install a topical moisture barrier. 3. Always moisture test and record the results at time of flooring delivery and installation. www.nfca.ca
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