Quick Answer: How Thick Should Subfloor Be Under Tile?

How thick should cement board be under tile floor?

Floors: A 1/4-inch minimum thickness is needed, but thicker panels are also fine.

Walls: Use 1/2-inch or 5/8-inch-thick cement board, not 1/4-inch.

The extra thickness is needed to span the studs and provide a solid base for the tile..

What subfloor should be under tile?

Exterior plywood is an acceptable underlayment for tile and is preferred to interior-grade plywoods because the bonding adhesives used are waterproof. … When used as an underlayment, the plywood sheets are laid over the OSB or plywood subfloor, for a two-layer base.

Can I just screw down cement board?

Most cement board manufacturers require galvanized roofing nails or cement board screws. But this doesn’t stop people from trying to use ring shank nails, drywall screws, or who knows what else? The problem is that those fasteners don’t have the holding power that cement board screws and roofing nails have.

What is the minimum subfloor thickness for ceramic 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.

Can you lay tile on OSB subfloor?

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.

Do bathroom floors need to be waterproofed?

Bathrooms are, by nature, wet spaces. But you want to be sure that water doesn’t leak through walls and cause mold or other damage. To avoid leaks and excess moisture build-up, take care to waterproof your bathroom wall, floor and ceiling.

What is the best plywood for underlayment?

Today, a much better option is a plywood specifically designed as underlayment and made with sustainably forested wood. You can also use AC exterior-grade plywood, which has one smooth face and one rougher face. Always install underlayment with the smoother face up.

Is my subfloor strong enough for tile?

Tile installed over wood floor systems MUST have a minimum of 1-1/4 inches of solid material beneath it. This means you can have a 3/4 inch wood subfloor covered by 1/2 inch plywood, cement board, or approved gypsum fiber underlayment.

What is the best subfloor for porcelain tile?

1. Backer Board. This is the industry standard most preferred by construction pros when installing ceramic or porcelain tile. Backer board comes in four-foot-by-eight-foot and three-foot-by-five-foot rigid panels that contain a combination of cement, fiberglass, and sometimes crushed glass particles.

Do you have to put cement board under tile?

In short, tile and grout are not inherently waterproof. … Cement backer board is often used as a tile base on plywood or OSB subfloor. Cement backer board on concrete as a subfloor or underlayment is usually not recommended or needed. In most cases, you can apply tile directly to the concrete.

Can you tile directly on subfloor?

While tile can be laid on plywood, do not install tile directly onto the plywood subfloor itself. Use intervening layers of two sheets of plywood.

What is the best underlayment for a bathroom floor?

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.

How thick should a bathroom subfloor be?

The subfloor rests directly on the floor joists and is the lowest layer of flooring material. Plywood three-quarters inch thick is the most common and the strongest.

Can I use plywood under tile?

Oriented strand board (OSB) and exterior-grade plywood will work if first covered with a latex-modified mortar and a tiling backer board. Install a cement-based backer board following the manufacturer’s instructions. This provides a solid surface under the tile that prevents flexing that could lead to cracking.