Why Visual Inspection Is Unreliable
Dense materials — wood framing, concrete, subfloor — release surface moisture quickly but retain internal moisture for much longer. A board that feels dry to the touch and shows no visible dampness can still have moisture content well above the threshold for mold growth. This is why restoration professionals take daily moisture readings rather than relying on visual or tactile assessment.
Using Moisture Meters
Pin-type moisture meters measure the electrical resistance of a material — wet materials conduct electricity more readily than dry ones. Standard dry values: wood at 8 to 12 percent, drywall below 1 percent on a drywall scale, concrete readings that return to baseline levels established before the water event. Pinless meters measure impedance across a broader surface area and are useful for scanning large areas quickly.
The Drying Log Standard
Professional restoration requires a written drying log documenting moisture readings at established monitoring points each day. The log demonstrates that drying was completed to standard — important for insurance documentation and preventing future disputes about whether mold resulted from incomplete drying. Ask to see the drying log at the completion of any professional restoration job.
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