Minimum Subfloor Thickness For Ceramic Tile

The thickness of plywood panels in a subfloor is regulated by the.

Minimum subfloor thickness for ceramic tile. Tile installed over wood floor systems must have a minimum of 1 1 4 inches of solid material beneath it. The finished floor is then installed on top of the subfloor. The bare minimum recommended by most tile setters is a total subfloor thickness of 1 1 8 inch. 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.

Osb o 1 grade and. Regardless of the material it must be at least 1. We are planning on using ceramic tile with granite counter tops. Adding inch plywood to 5 8 ply will give you a combined nominal thickness of 7 8 inch.

An extra layer of ceramic tile adds substantial thickness to the flooring layer. Preparing a subfloor is an essential step for installing floor tile it provides a level surface that will allow the tiles to properly stay in place. A subfloor system that worked fine for a single layer of ceramic tile may not be strong enough to handle the many hundreds of extra pounds added when a second layer is added. The subfloor is the decking installed on top of flooring joists.

I have visited several tile stores and received conflicting subfloor thickness requirements. This guide will show you how to prepare your subfloor for a tile installation project to ensure that it s fit to support ceramic or porcelain tile. Most of the cabinets are on the perimeter on the room with a peninsula that runs to the center of the room 7 from the outside wall. This means you can have a 3 4 inch wood subfloor covered by 1 2 inch plywood cement board or approved gypsum fiber underlayment.

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. 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 subfloor is 5 8 t g. Most prefer a minimum thickness of at least 1 1 4 inch such a inch t g subfloor with inch plywood underlayment.

Maximum spacing of supports mm.