Detecting Moisture in Old Slabs Before Flooring Installation

Old concrete slabs can hold moisture that doesn’t show on the surface. Cliff Bowden, owner of Cliff’s Custom Floors, demonstrates how he checks an existing slab for hidden moisture before installing flooring: what to look for, where moisture tends to linger, and what testing catches it.

Related: hidden problems in floor trenching, how a new floor can fail when the old flooring was fine, and how a nine-month-old slab can still be at 95% RH.

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Last updated on August 19th, 2026

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