Tiling Over Plywood Underlayment

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Tiling over plywood underlayment.

For residential use one form of underlayment the tile council of north america s handbook allows is plywood over joists that are 16 in. Tape over holes and cracks in the wood subfloor or slab before pouring on the self leveling tile underlayment to keep it from seeping through and leaving indentations. Check for dips in the floor by sliding a 4 foot to 6 foot straight edge in different directions all around the room. Fill seams in the subfloor with caulk.

Once properly in place and cured the tile can be installed. Once the surface is completely covered cover the adhesive with the fiberglass based paper and smooth out any wrinkles or bubbles with a broad drywall knife. This prepares and seals the surface for the. Use intervening layers of two sheets of plywood.

Roll on a layer of latex primer sealer. No matter how firm the subfloor. Tape off any affected vents with painter s tape. Use thinset with a higher latex content thinset is the wet base that you first trowel on the plywood to make the tile stick.

A tapered piece of plywood may be difficult to fabricate and may not offer the support required for a good installation. If the structure is adequate the use of a cement based floor patch that allows for the needed height may be the best choice. On a plywood subfloor you need either a layer of cement backer board or an underlayment membrane like custom building products wonderboard and redgard between the subfloor and tile for the thin set adhesive to achieve a good bond. Void free underlayment grade panels which both stiffen the existing floor and provide uniform support to prevent cracks in the tile above.

Step 5 skim coat the paper.