Subfloor moisture is a major factor in flooring longevity. For concrete, moisture vapor emission rates (MVER) and relative humidity tests are performed to ensure the slab is dry enough. For wood subfloors, moisture content must be equilibrated with the ambient indoor environment to prevent dimensional changes in the finished product. If moisture levels are too high, the flooring may expand or contract excessively, leading to gapping, peaking, or the growth of mold and mildew beneath the installed material.
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How does subfloor moisture content impact the success of a flooring project?
Excessive subfloor moisture content can cause flooring to buckle, warp, cup, or experience adhesive failure. Professional installers must measure moisture levels in concrete or wood substrates to ensure they fall within the flooring manufacturer's specified range before installation begins.