Is there a fully-intact, impermeable vapor barrier under the concrete slab?

If there isn’t, the risk of failure of any product that must adhere to the slab, including paint, epoxies, sealers, porcelain/ceramic tiles and other flooring that require adhesive, will have a high risk of failure due to moisture vapor emissions. What’s the condition of the slab? If it has cracks, is contaminated with oil, chemicals, old sealers or paints, is uneven or has other pre-existing conditions, these must all be fixed before any flooring that is adhered to the slab can be properly installed to prevent premature failure.

The cost of slab preparation, including shot-blasting, grinding or acid-etching, can far exceed the cost of the flooring material itself. Overall, the best garage flooring options are those that require minimal slab prep, use no adhesive, and go down directly over cracked, contaminated and uneven surfaces. They should also be easy to install and maintain, and are unaffected by moisture.

It’s important to compare the total costs for any flooring job— slab ... more.

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