Subfloor with a crack isolation membrane under the tile.
Tile on plywood subfloor.
The plywood will expand and contract at a different rate as the tile causing cracks to develop in the grout lines or tiles over time.
Plywood underlayment over a 3 4 in.
Install 1 4 inch cork by thin setting it to the concrete pad then installing the heating system by fastening it to.
Another tcna method f147 uses a min.
Because plywood is porous and installed in sheets to create a subfloor some preparations are necessary.
The crack isolation membrane is critical as it protects the tile from small movements in the wood subfloor.
The best method is to refasten the subfloor then add a layer of plywood.
After all backer board sheets are in position remove.
Thinset is the wet base that you first trowel on the plywood to make the tile.
Use the right.
First changes in humidity make solid wood shrink swell and cup more than plywood.
Arrange the sheets so that the ends are staggered and don t align with each other.
Lauan is not sturdy enough.
While you can lay tile directly over a concrete slab using thin set adhesive don t make the mistake of applying tile directly to a plywood subfloor.
There are two materials commonly used for laying ceramic on plywood or osb that are applied before the tile.
Exterior grade plywood exterior plywood is an acceptable underlayment for tile and is preferred to interior grade plywoods because the bonding adhesives used are waterproof.
Concrete board concrete board also called backer boardcomes in 1 4 and 1 2 thicknesses and is usually sold in 4 x 6 sheets.
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.
No matter how firm the subfloor.
Use thinset with a higher latex content.
Lay down a vapour barrier overtop the concrete pad then fasten 3 4 inch plywood using a ramset to the concrete pad.
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.
Leave a 1 4 inch gap between the edges of the backer board and the walls to allow for subfloor expansion and contraction.
According to backer board manufacturers and tile setters installing backer board directly over an old solid wood subfloor is risky for a couple of reasons.
It should be fastened to the subfloor using thinset and then screwed down every 10 square.
A couple options considered are.
If water seeps through the tile installation to the underlayment it will not cause the wood to swell as happens with interior grade plywood.
Plywood makes a smooth underlayment for peel and stick tiles.
