Flooring failures from slab moisture are expensive and avoidable.
In this article
Why it matters
Moisture breaks adhesives.
Test methods
Follow standards.
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Timing
After the building is enclosed.
HVAC conditions
Operating conditions matter.
Manufacturer requirements
Limits vary.
Mitigation
Sealers when needed.
A closer look
New slabs can take a long time to dry, and schedules rarely allow for it. When testing shows high moisture, the options are waiting, mitigation systems or different flooring. Each has cost and schedule impact, so test early enough to decide calmly, document results and share them with the owner and flooring sub before install day.
Where to start
Add moisture testing as a schedule activity weeks before flooring.
Common mistakes
Testing too early, skipping manufacturer limits and installing anyway.
An example
A contractor tested slabs six weeks before flooring and found high readings in one wing. There was time to install a mitigation system without delaying turnover.
What to track
Track test dates, readings by area, mitigation decisions and flooring warranty conditions.
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Frequently asked questions
How is concrete moisture tested before flooring?
Common methods include in-situ relative humidity probes and other tests specified by flooring manufacturers. Tests should be done under the conditions required by the standard.