How thick should a plywood subfloor be for tile?

1 1/8″ thick

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 tile right over plywood 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.

What kind of plywood do you use for tile subfloor?

In general, “Oriented strand board (OSB)” and “exterior-grade plywood” are the best type of underlayments for floor tiling. It works fine if first covered with a latex-modified mortar and a backer board. You should avoid using veneer-bond plywood.

Can 5/8 plywood be used on a floor?

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.

What thickness subfloor is recommended?

The spacing of the joists governs the recommended thickness of the plywood subfloor. Some experts suggest that 15/32-inch plywood should be standard if the underlying floor joists are spaced 16 inches apart or less, but you should use slightly thicker 3/4-inch plywood for joists spaced further apart.

What subfloor is needed 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.

Can you tile straight on to plywood?

Under British Standards BS 5385 Part 1, plywood is not a suitable substrate for the direct fixing of wall tiles, therefore when tiling onto walls, a tile backer board is required.

How thick is backer board for tile?


The most common thickness of tile backer board is 1/2-inch. Quarter-inch and 5/8-inch thicknesses can also be found.

Will Thinset stick to plywood?

Plywood and the flooring to which it is attached must be at least 1 1/8 inch thick to support the weight of thinset and tiles. Only exterior-approved plywood will support the weight; interior plywood and particleboard do not have the same strength and will buckle under the tiles.

What thickness plywood should I use for bathroom flooring?

Consider what the top layer of the bathroom flooring will be since some types of plywood are better suited for different flooring. For hardwood, tongue-and-groove CDX plywood rated AC with a 5/8- to 3/4-inch thickness is best. Specifically for subflooring, tongue-and-groove plywood is strong and will reduce squeaks.

What is the actual thickness of 5/8 plywood?

The actual thickness is just like it sounds – the actual thickness of the plywood panels you buy, after sanding. Typically, the actual thickness of plywood is 1/32 inch less than the nominal thickness.
Thickness in millimeters.

Thickness (inch) Thickness (milimeter)
5/8” 15.9mm
3/4” 19mm
1-1/8” 28.6mm
1-1/4” 31.75mm

What type of plywood is used for bathroom subfloor?

CDX plywood

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 Ceramic tile underlayment be?

1-1/8 inches thick

The floor and subfloor combined should be at least 1-1/8 inches thick for proper support. If your existing floor is covered in cushioned vinyl or linoleum, it’s best to remove it, but you can also cover it with an underlayment.

Is it better to use OSB or plywood for subfloor?

OSB has a lower resale value than plywood due to its lower strength. For this reason, few homeowners prefer OSB in their homes. Apart from costs, plywood is superior in all the other areas, such as the strength of the structure. For this reason, it’s a superior material for use on the subfloor.

Can you use non structural plywood for flooring?

Absolutely! Since most non-structural plywood is either Grade A or B, its intended purpose is to be seen. One of the best ways to use this sort of high-grade plywood is to use it as flooring. You can paint your plywood to fit the image of your perfect room.

What can I use non-structural plywood for?

Non-Structural Plywood (CD)
Non-structural plywood is an economical plywood sheet for use in a broad range of applications from hoardings to furniture and wall linings. Made with an A bond glueline to give it durability and performance. Non-structural ply is well suited to painting or staining.

What is the difference between CD and DD plywood?

Construction ply in CD or CPD or DD comes as either a non-structural or an ASNZ2269 certified structural panel. CD has one sanded face, while D face allows for some unfilled knots & splits. With a marine glue this is used in all aspects on interior construction.

What’s the difference between hardwood plywood and structural plywood?

The biggest difference between Structural Plywood and Non-Structural Plywood is all in the type of glue used when the sheets are being produced.

Is elliotis plywood waterproof?

Elliotis Plywood is a softwood plywood bonded with a water and boil proof (WBP) glue. This plywood’s many uses include roofing, ground protection, temporary fencing and hoarding as well as shuttering when pouring concrete.
Branch Click & Collect Time Frames.

Branch Timeframe
Portadown (Mahon Road) 1 Hour

Do I need structural or non-structural plywood?

To put it simply, anything you can find where the building code is specifying plywood materials and material thicknesses, requires structural plywood, especially if these materials can end up being exposed to rainfall before the home is dried-in. This includes flooring, wall sheathing and roof sheathing.