A moisture test is one of the most important steps in any flooring installation — and one of the most commonly skipped. Here's what it is and why it matters.
What a Moisture Test Measures
A subfloor moisture test measures the moisture content of the subfloor material (wood) or the moisture emission rate from a concrete slab. High moisture content in a wood subfloor indicates active or past water exposure; high emission from concrete indicates moisture vapor moving up through the slab from the ground.
Why It Matters for Your Installation
Wood flooring installed over a subfloor with high moisture content will absorb that moisture and expand — eventually cupping, buckling, or developing mold. Hardwood floors over concrete slabs without vapor barriers are a common source of warranty-voiding failures. The moisture test tells us what we're dealing with before anything goes down.
What We Do With the Results
If moisture levels are acceptable, we proceed with installation. If they're elevated, we discuss solutions: vapor barriers, vapor retarders, self-leveling moisture-control products, or material substitution (LVP instead of hardwood, for example). These conversations happen before installation, not after.
Ready for a Free Estimate?
Moss Bay Flooring Co. serves Kirkland, Bellevue, Redmond, Sammamish, and all of the Eastside. Every estimate is free, in-person, and includes a written quote.
📞 (425) 832-8584