Finish TradesQuestion 236 of 700
Before nailing down solid strip hardwood over a wood subfloor, an installer checks moisture content of BOTH the flooring and the subfloor. Best practice is to keep the difference between them within about:
a.No limit; any difference is fine
b.2 to 4 percentage points
c.15 percentage points
d.20 percentage points
Explanation
Wood flooring guidance keeps flooring and subfloor moisture within roughly 2 to 4 percentage points (tighter for wide planks) so the boards do not shrink or cup after installation. Ignoring the difference or allowing 15 to 20 points guarantees gaps, cupping, or buckling.
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