How moisture vapor moves through slabs, how it is tested and what it can do to a coating.
Concrete looks solid, but it holds water and can release moisture vapor for years. If that vapor is trapped under a sealed coating, it can cause bubbles, blisters and peeling. Moisture comes from the ground, from rain that pools against the garage and from humid air meeting a cool slab. Testing before you coat shows whether the slab is ready or needs a moisture-mitigating primer, and it is one of the most useful steps in a floor project.
Common tests include a taped plastic sheet, calcium chloride kits and probes that measure humidity inside the slab. Each has strengths, and using more than one gives a better picture. Nashville gets heavy spring rain and humid summers, and clay soils hold water, so slabs on grade are often wetter than owners expect. If readings are high, a vapor-blocking primer can help. If the cause is a leak or poor drainage, fixing that comes first. Honest testing prevents expensive redo work.
Ground water, rain and humid air all play a part.
A quick check for moisture under a taped square.
Measures vapor emission over a set time.
Measure relative humidity inside the slab.
Slow vapor so coatings can bond.
Drainage and leaks come first.
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We can use a vapor primer or advise waiting, depending on the readings.
Not always, but it is a reason to look at drainage.
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