FAQ: What Kind Of Plywood For Subfloor For Tile?

How thick should plywood subfloor be for tile?

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.

Which plywood is best for subfloor?

CDX plywood is the most popular type of traditional plywood. It’s made with a rough outer layer that typically grades C, D or X. Almost all subfloor plywood is some type of CDX. There’s no reason to buy high grade finished plywood for use as a subfloor if your just going to cover it up with finished flooring.

What type of plywood is used for bathroom subfloor?

Plywood as a Subfloor Material Traditionally, exterior grade plywood has been the subfloor material of choice for many bathroom flooring projects. Plywood is made by gluing alternating layers of wood veneer. CDX plywood (¾”) in particular is used often because it has a high level of resistance to moisture and humidity.

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Can I tile directly over plywood?

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.

Is my subfloor strong enough for tile?

How Thick Does the Subfloor Need To Be for Tile? Tile is heavy, and the larger the floor you’re tiling and the thicker the tile, the heavier it’s going to be. That’s why, on average, your subfloor should be at least 1 ⅛” (2.86 cm) thick with a layer of concrete or ¾”-⅝” (1.91 to 1.59 cm) plywood or OSB underneath.

Do you nail or screw subfloor?

Using code-approved screws rather than nails is the best option for avoiding movement. If using nails for subfloor installation, stick with ring-shank nails; smooth nails may withdraw easier, leading to squeaks.

Is it better to use OSB or plywood for subfloor?

The National Tile Contractors Association and the Resilient Floor Covering Institute both recommend plywood for subflooring and underlayment, because it doesn’t have the risk of swollen edges that OSB does. Plywood also has a slight advantage in stiffness, which means that subflooring panels need not be quite as thick.

Is it OK to use treated plywood for subfloor?

Under the IRC this 19% or less moisture content lumber is called kiln-dried-after-treatment lumber and is perfectly acceptable to be used in structural sheathing, subflooring, or framing.

Do I need to seal plywood before tiling?

The plywood surface will then be the surface to be tiled. So your nice new clean ply floor isn’t so clean anymore and if it’s not prepared properly prior to tiling, the adhesive will just go onto the dirt on the floor and might not stick! This is why it is better to prime it than not to.

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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 waterproof a bathroom subfloor plywood?

Apply a bead of the silicone caulk around the entire perimeter of the subfloor. Place the angled part of the nozzle flat against the crevice between the subfloor and the bottom of the wall and squeeze the trigger slowly. Move the caulk gun evenly along the crevice to apply a bead of caulk.

How thick should plywood be for flooring?

The minimum thickness of plywood for subflooring is about 5/8 inch. Since it does not hold fasteners as well as plywood, OSB must be a little thicker, or at least 23/32 inch. There are several factors that determine what subfloor thickness is optimal for added benefits like insulation.

What is the best material to use for a subfloor?

Plywood. Plywood is considered the most popular material used for subflooring, it has been used since the 1950s and remains one of the top choices for contractors. Standard plywood works perfectly fine as a subflooring material, but the best option is ¾” tongue-and-groove plywood subflooring.

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