Concrete Boards Over Floors

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.

Concrete boards over floors. 500 750 square feet of coverage. If you have a concrete subfloor then you should not be contemplating installing cement board over it. For the floor adhesive to properly stick the floor must be clean. Cement board is an easily installed diy tile underlayment providing a stable dependable tile setting substrate while eliminating the complicated lath and mortar floating process.

I know it seems like a smooth surface and it seems like it may fix some of the issues with the concrete floor but don t do it. Using a glue down floor is an option in above grade installation only since installation below grade requires a plastic barrier on top of the concrete. Treated plywood to the concrete with concrete screws spaced every 16 in. This is a distinct advantage over plywood and drywall.

Use a quality cleaner like zep professional concrete and masonry floor cleaner 27 per gallon. Cover the sleepers with 6 millimeter plastic and then lay down 5 8 inch plywood. However a homeowner may need to raise the floor slightly before installing tile and lack the experience or time to install a mortar bed. Alternatively screw rows of treated 1x4s to the concrete 16 in.

Do it yourselfers can use either 1 2 or 1 4 inch cement board in certain applications while other scenarios mandate 1 2 inch board. Whenever you re laying tile on a wood subfloor you need to first install cement backerboard to prevent leaks and water damage. I installed a new base layer and oak floor around that area where the tile is so my tile is now 1 5 inches below the new wood floor. Placing cement boards over the concrete subfloor is an excellent way to create a solid and smooth subfloor.

First changes in humidity make solid wood shrink swell and cup more than plywood. Concrete is usually a good subfloor on which to install ceramic tile. I was thinking about putting down cement board and new tile over the old tile to get the floor levels to be close enough that a transition threshold would work. The ideal way to put down a wood floor over concrete that is subject to dampness is to first put down pressure 2 by 4 inch sleepers or lengths of wood on the floor that are spaced 16 inches apart on center.

The primary benefit of cement board is that it doesn t break down or expand or warp if it gets wet. Second the strength of wood boards isn t always consistent. Cement board is a type of underlayment that is now standard for most tile installations but particularly for floor tile. It s available in sheets of many sizes with 3 foot by 5 foot sheets being the most common.

Lay 6 mil polyethylene sheeting over the concrete to minimize moisture migration from the concrete up into the wood flooring. Cover the plywood with 15 pound roofing felt and then.