Can I Put Floor Tile Directly On Plywood. You will need to purchase a polymer mortar that meets required standards. Use thinset with a higher latex content thinset is the wet base that you first trowel on the plywood to make the tile stick. So it is better to put sheets of plywood before placing the tile on it.
Then you want to install screws into the concrete board in each of the holes. While tile can be laid on plywood, do not install tile directly onto the plywood subfloor itself. One question that folks new to ceramic tile frequently ask is whether they can lay the ceramic directly on top of a plywood or osb subfloor, using a thinset cement or liquid nails to glue down the tile to the wood.
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And one can put those vinyl tiles on the bare plywood underlayment. Use intervening layers of two sheets of plywood. I really don't want to pull up the 1/2 inch plywood since it is so solid. That's not meant to be an arguement with those here who indicate they do it all the time witn no problems.