Manufacturers also recommend bonding cement board to floors with a 1 4 inch polymer modified thinset coating.

Tile over plywood vs cement board. There are two materials commonly used for laying ceramic on plywood or osb that are applied before the tile. This is a distinct advantage over plywood and drywall. 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. 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.

Plywood vs cement backerboard underlayment flex and lippage. The primary benefit of cement board is that it doesn t break down or expand or warp if it gets wet. While it is possible to find very smooth consistent pieces of plywood most of these are reserved for. To install cement board on floors cement board manufacturers mandate a 5 8 inch plywood subfloor or osb underlayment.

It should be fastened to the subfloor using thinset and then screwed down every 10 square. Cement backerboard is made for tiling. Cement board also provides an additional layer over a plywood or particleboard subfloor adding stiffness to the tile installation to help prevent cracks. Even if you use a waterproof underlayment membrane the floor will still be either 1 4 or 1 2 higher than the subfloor plus the thickness of the tile and adhesive.

Concrete board concrete board also called backer board comes in 1 4 and 1 2 thicknesses and is usually sold in 4 x 6 sheets. However before you lay your cement board there s a little prep work that needs to be completed first. The first thing you ll want to do is check your plywood subfloor for any bending or deflection. Cement board is a type of underlayment that is now standard for most tile installations but particularly for floor tile.

Easy cutting and. These two issues can cause grout joints to pop or the tile to crack and or become loose. The safest most prudent course is to install tile on top of a cement backerboard such as durock wonderboard or hardiebacker. While i prefer using 1 2 cement backer board over a plywood subfloor you may be able to get by with 1 4 backer board instead.

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