(Some cement board products may not require the underlying membrane if the … (Some cement board products may not require the underlying membrane if the seams are properly waterproofed.) Cement backer boards, on the other hand, do not have this issue, which is why they are used instead of drywall. Entire bathroom is only 6' x 7'. When considering plywood for sheathing, builders choose from 1/2-inch CDX -- common construction-grade material -- or 1/2-inch pressure-treated plywood. You cannot put a cement backer board over that. I've seen it in other houses. Those 1x8 boards won't give a solid foundation and will flex. While most people may not have initial problems with laying tile directly on plywood, that will change due to seasonal expansion and contraction. On a plywood subfloor, you need a layer of cement backer board or an underlayment membrane between the subfloor and tile for the thin-set adhesive to achieve a good bond. Cement backer board was developed first to replace the cement mud and metal lath systems installed by real craftsmen. I have that in my residence. The plywood for cast in place concrete countertops is a permanent portion of the formwork. Cement backerboard is designed specifically for this use. Randy: Putting thin set under the Durock is the best way to fill and stabilize the board. Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB). Do I need plywood under cement board? Another problem is that mold grows in drywall, so if moisture is passing through the cement board into the drywall, it's creating ideal conditions for a mold colony, which will hasten deterioration of the wall studs and create a giant headache in a few … The Surface Below the Cement Board Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB). I'm thinking about installing 1/2" cement board under the shower pan (and surrounding area to provide for a smooth tiling surface). Tile backer board now comes in all different types from cement to specialized gypsium-core products that are faced with fiberglass. AsktheBuilder.com: Backer board is a term used to describe a drywall-like product that goes behind ceramic tile. If you're installing a shower base on a wood floor covered with plywood or a similar type of particle board, no cement is necessary under the shower base, as long as the flooring is flat and strong. Or something similar? The Surface Below the Cement Board. The plywood simply serves only as a form bottom, to keep concrete out of the cabinets, and it ceases being necessary once the concrete cures. When it is supported by plywood or such it is much more resilient provided they are sufficiently bonded (screws work fine as iLikeDirt mentioned, but some like to supplement that with construction adhesive for a … Some shower bases require a cement bed to provide proper support of the shower base floor and to facilitate drainage. The best argument when determining whether to use plywood or cement board under tile is in the adhesive process. Very small room. Cement board is brittle and is not suitable for unsupported use as a floor. Cement-based backer board stabilizes the plywood substrate and provides a flat, even surface for tile. Note that you do need to protect the plywood with a moisture-proof barrier, or it will swell. Question is: Do I use mortar between the plywood and the cement board or do I attach the cement board directly to the plywood and use mortar on top for leveling? You need to put a layer or plywood, minimum 5/8 IIRC, over those boards, then mortar the backer to the plywood. Use a 1/4" notched trowel,spread on the sub floor, place the Durock down and take a rubber hammer and tapping the board several times to fill any low areas of the plywood. Do this and you will not have any gaps between the Durock and plywood. Plywood is porous, and not designed for use with most of today’s latex-based thinset mortars. OSB Vs. Plywood Sheathing.
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