Tile Floor Subfloor Thickness

If you re installing backer board over an existing subfloor 1 4 inch is sufficient.

Tile floor subfloor thickness.

If it was 3 4 you could install 1 2 plywood over your existing 5 8 then 1 4 cbu then your tile. Most prefer a minimum thickness of at least 1 1 4 inch such a inch t g subfloor with inch plywood underlayment. For more information download our pdf about types of subfloors. A 3 4 inch plywood subfloor on a joist structure with 24 inch spacing needs the extra thickness of cementboard or the floor will flex and the tiles will crack.

But combined with other methods that measure the finish floor you can get a fairly accurate reading of total floor thickness. Preparation for installing floor tile depends on the type of subfloor in the room you are tiling. If you have an older subfloor constructed of multiple slats rather than large sheets of plywood you can insert your straight edge between the slats. This method only measures subfloor thickness.

Uncoupling membranes aren t recommended for tiles smaller than 2 inches square and should not be used when covering old hardwood flooring due to adhesion problems. Adding inch plywood to 5 8 ply will give you a combined nominal thickness of 7 8 inch. I am installing ceramic 12 inch by 12 inch tiles in my foyer 150 sq ft. It supports your decorative floor finish whether it s carpet hardwood vinyl laminate or tile.

Tile subfloor thickness deflection installing electric radiant heat pouring self leveling mortar leveling flattening the subfloor installing cement board cbu installing schluter ditra marking guidelines for tile how to lay tile how to grout tile joints there s a lot of information and mis information online about what constitutes a suitable subfloor for tile and it s tough to find a. A subfloor is the bottom most structural level of your floor. I was thinking 1 4 durock and 1 4 tile which would make my floor height almost the same as my hardwoods in the other rooms. The subfloor must be structurally sound as well as thick and stable enough to hold the weight of the tile without moving or flexing.

The floors joist are 19 on center. Should i install durock before laying the tile. I am laying the tile on a plywood sub floor above a basement. The bare minimum recommended by most tile setters is a total subfloor thickness of 1 1 8 inch.

Regardless of the material it must be at least 1.