underlayment for tile

Exterior-Grade Plywood

Exterior plywood is an acceptable underlayment for tile and is preferred to interior-grade plywoods because the bonding adhesives used are waterproof. If water seeps through the tile installation to the underlayment, it will not cause the wood to swell, as happens with interior-grade plywood.

Do I need an underlayment for tile?

When you are tiling, the ground underneath your tiles needs to be well prepared. You achieve this by providing a protective layer of underlayment on top of it. A cement board or backer board is the best for this purpose. The boards protect against moisture in flooring materials.

Do I need underlayment for tile on plywood?

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.

Can you tile directly on subfloor?

Tile can be laid on plywood. But do not install tile directly on the plywood subfloor itself. Use an intervening layer of a sheet of thinner plywood.

How thick should Ceramic tile underlayment be?

The subfloor under the tile should be at least 1 1/8″ thick, with a minimum of 5/8″ thick exterior grade plywood topped by 1/2″ cement backer board.

Do you need a moisture barrier under tile?

A moisture barrier helps control the water vapor’s movement to help protect your floors. Therefore, if you’re installing floors in an area that sees moisture, even a little, a vapor barrier is needed.

Do you need cement board for tile floor?

Whenever you’re laying tile on a wood subfloor, you need to first install cement backer board. Backer board prevents leaks and water damage that could harm your flooring and the structure of your home.

Can I lay tile on plywood?

As a general rule, you can lay tile over plywood. However, you need to ensure the plywood subfloor is 1 and ¼ inch (3 cm) thick. It’s also recommended to use a cement backer board on top of the plywood, but some tilers make a cement backer board by hand.

Can I use cement board instead of plywood?

Cement backerboard is more stable than plywood in high humidity and other wet environments. It won’t swell and buckle the way that plywood does, so it’s safe to use in mudrooms and bathrooms where things like spills and puddles are normal, as well as in areas with high levels of moisture in the air.

How do you seal plywood before tiling?

Floorboards will need to be primed using two neat coats of BAL Prime APD, best practice is to apply the second coat 90° to the first coat, allowing it to dry between coats. Then apply a highly flexible tile adhesive (S2) such as BAL Fast-Flex using a Topps Tiles Pro Tipped 3mm trowel.

How do you prepare plywood for tile subfloor?

Prepare a Wood Subfloor for Tile

Check for dips in the floor by sliding a 4-foot to 6-foot straight edge in different directions all around the room. Mark any uneven spots you find so that you can make them level. Fill seams in the subfloor with caulk. Tape off any affected vents with painter’s tape.

Can you tile over OSB board?

Ceramic tiling can be installed onto 23/32” OSB subflooring panels where the panels are supported by 16” o.c. joist spacing. Manufacturers generally recommend that the deflection of the subfloor system be limited to no more than span/360 under total load.

What thickness ply to tile on?

British Standards recommend a minimum of 15mm thick plywood to be used for over-boarding purposes (any less will not provide the rigidity required). This involves screwing a sheet of plywood over the top of the existing floorboards / chipboard or plywood to provide extra rigidity and a flat surface onto which to tile.

Can you use 1/4 cement board on floors?

Can I use 1/4 cement board on floors? Both 1/4- and1/2-inch cement board are appropriate for floors. To install cement board on floors, cement board manufacturers mandate a 5/8-inch plywood subfloor or OSB underlayment. They also require a 3/4-inch subfloor where tile size exceeds 12 inches.

How do you prepare a wooden floor for tile?

The first step in preparing wood floors to receive new tile involves securing plywood subfloors or hardwood to the joists below. Use 2-inch screws every 3 inches along the length of each board to firmly fasten the wood to the joists, then cover the entire surface with 1/2-inch thick sheets of plywood.