A story that comes up often enough to be a pattern: a company shows up after a pipe burst or a leak, runs fans for a few days, says "all dry," and hands over a bill. A month later, there's a musty smell that wasn't there before. It turns out no one ever pulled the baseboards or checked inside the wall cavity — the moisture readings taken at the drywall surface said everything was fine, while the framing behind it was still wet and had already started to mold.
Surface-dry and actually-dry are not the same reading
A moisture meter placed flat against a drywall surface tells you about that surface. It doesn't tell you what's happening an inch behind it, inside a wall cavity, under a baseboard, or beneath flooring. Water travels and wicks into places that aren't visible from the room, and a drying job that only checks the parts you can see without opening anything up is checking the easy spot, not the whole picture.
A simple check you can do yourself
If you're unsure whether a past job was actually finished, or you want a second opinion before signing off on a current one, a pin-type moisture meter costs around $40 at most hardware stores. Check along baseboards, in corners, and anywhere trim meets a wall — these are common spots where hidden moisture shows up first. As a general rule of thumb, a reading above roughly 15–20% suggests the material isn't dry yet, though the exact target varies by material type, which is why professionals reference material-specific dry standards rather than one flat number.
What the pros use that you probably don't have
Thermal imaging cameras let a technician see temperature differences that indicate moisture behind a surface without cutting into anything — it's one of the fastest ways to find a wet spot that a surface-level meter reading alone would miss. If a company used thermal imaging during your job, ask to see the images. If they didn't use it at all on a loss involving wall cavities or flooring, that's worth asking about.
The question that actually matters
Before calling anyone back — or calling someone new — ask for the documentation: moisture readings tracked over multiple days, showing the material reached a dry standard, not just a technician's word that it's done. A company that dried the job correctly will have that record without having to go looking for it. One that didn't will have a much vaguer answer.
If you're noticing a musty smell, seeing discoloration, or just have a gut feeling after a past job, a second opinion with a moisture meter and thermal imaging is a fast way to find out whether that feeling is right.
Expert Restoration LLC handles emergency water, fire/smoke, and mold mitigation across Thurston, Mason, Lewis, and Grays Harbor counties — with the documentation to back up every claim we make about the work. Call (360) 480-7540.