Can You Put Vinyl Floor On Concrete. The rule of thumb is any vinyl over 4mm can have a vinyl specific underlayment. So technically, if you are installing vinyl plank flooring onto concrete you already have a subfloor. A concrete subfloor typically requires very little preparation for vinyl flooring.

Once you prepare the concrete subflooring, just align, click the planks into place, and your vinyl floor will come together in a short time. A copolymer resin primer is recommended for sealing and waterproofing the concrete. The concrete floor has large cracks, so the best way is to remove most of the slab, and then replace it with a new concrete slab.
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If its not sealed 100% you just made issue worse. However, some people prefer to add another thin layer of subflooring between the concrete and vinyl. So technically, if you are installing vinyl plank flooring onto concrete you already have a subfloor. Click to see full answer.