How do I waterproof my garage floor from condensation?
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Use a concrete sealer (I’m guessing it’s concrete. They are made by several companies and prices run the gamut.
https://www.amazon.com/s?k=Concrete+sealer&ref=nb_sb_noss
You might also try a dehumidifier.
Yep, you need a sealer.
https://www.homedepot.com/b/Paint-Exterior-Stain-Sealers-Concrete-Sealers/Sealer/N-5yc1vZcj9bZ1z0oepl
https://www.menards.com/main/paint/concrete-blacktop-sealers/concrete-sealers/c-5651.htm
Insulate any ductwork in your garage, using mastic tape for seam joint sealing.
Insulate any water pipes, as well, which will sweat in summer heat.
If walls show evidence of water infiltration, you'll need to apply a watersealer to walls, and regrade outside the garage to keep water away.
it needs a sealer put on it