Tiling Over Plywood Underlayment

No matter how firm the subfloor.

Tiling over plywood underlayment.

The plywood will expand and contract at a different rate as the tile causing cracks to develop in the grout lines or tiles over time. This prepares and seals the surface for the. The go to product is 1 2 in. 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.

Begin by applying the thin skin adhesive to the plywood with a smooth trowel. Tape off any affected vents with painter s tape. 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. Once properly in place and cured the tile can be installed.

A tapered piece of plywood may be difficult to fabricate and may not offer the support required for a good installation. Check for dips in the floor by sliding a 4 foot to 6 foot straight edge in different directions all around the room. For residential use one form of underlayment the tile council of north america s handbook allows is plywood over joists that are 16 in. Void free underlayment grade panels which both stiffen the existing floor and provide uniform support to prevent cracks in the tile above.

Roll on a layer of latex primer sealer. Step 5 skim coat the paper. Fill seams in the subfloor with caulk. 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.

Use intervening layers of two sheets of plywood.