Tile Floor Subfloor Thickness

I am installing ceramic 12 inch by 12 inch tiles in my foyer 150 sq ft.

Tile floor subfloor thickness.

Adding inch plywood to 5 8 ply will give you a combined nominal thickness of 7 8 inch. If you are removing particle board then using the same size plywood will bring you back to the right height that you had before. If it was 3 4 you could install 1 2 plywood over your existing 5 8 then 1 4 cbu then your tile. 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. Most prefer a minimum thickness of at least 1 1 4 inch such a inch t g subfloor with inch plywood underlayment. If you re installing backer board over an existing subfloor 1 4 inch is sufficient. This method only measures subfloor thickness.

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. I am laying the tile on a plywood sub floor above a basement. Cement fiber or similarly reinforced backer board comes in standard 1 4 inch and 1 2 inch thicknesses.

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. The bare minimum recommended by most tile setters is a total subfloor thickness of 1 1 8 inch. Should i install durock before laying the tile. For more information download our pdf about types of subfloors.

A subfloor is the bottom most structural level of your floor. Regardless of the material it must be at least 1. 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. But combined with other methods that measure the finish floor you can get a fairly accurate reading of total floor thickness.

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.