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Do you have to use thinset under backer board?
Using thinset under cement board is a commonly skipped step amongst many contractors. However, many manufacturers including, both Durock and Hardiebacker not only recommend that you use thinset under their backerboard, but they specify it and will void the warranty on their product if it’s not used.
Can you use backer board on the floor?
All of your backer board pieces should be cut before they are placed on the floor. Along the perimeter, screws should be installed at least ½ inch from the edge, but no more than 2 1/4 inches. You will want to go and check every seam. Double the screws in those areas just to be sure it is attached properly.
Can I screw cement board to subfloor?
Cement board can be installed over a plywood subfloor using an appropriate construction adhesive and screws for a quicker project that’s less messy than taping and mudding.
Should you tape cement board joints?
The thinset and mesh tape are to strengthen the seams. If you are going to tile over the cement board, you should tape the seams. This should not be that difficult.
Can you use 1/4 inch cement board on floors?
1/4″ USG Durock® cement board is an ideal substrate for floor and countertop ceramic tile installations. The 1/4″ thickness helps eliminate transition trim when abutting carpet or wood flooring and minimize level variations with other finish materials.
What kind of thinset goes under cement board?
An unmodified thinset (Masterblend) is fine between the Hardi and the subfloor. The reason for the layer of thinset between the cement board and the subfloor is to fill the voids/gaps between the two. It’ll keep the cement board from moving up and down.
How far apart do you screw backer board?
Secure Backer Board with Screws Drill cement board screws through the backer board sheets every 6 to 8 inches. Position the screws at least 1/2-inch, but no more than 2 inches, from the edge of the sheet.
Can you put tile directly on subfloor?
Tile can be laid on plywood. But do not install tile directly on the plywood subfloor itself. Use an intervening layer of a sheet of thinner plywood.
What goes under Backerboard?
For flooring, the backer board should be installed over a 5/8-inch thick OSB or plywood base. For countertops, use 3/4-inch plywood beneath the backer board. And for walls and ceilings, apply 1/2-inch or 5/8-inch backer board screwed directly to the wall studs or joists.
Can you tile straight onto backer board?
As a building material, interior fibre cement tile backer board products are especially suited as a tiling base for tiling wet areas such as bathrooms, kitchens and showers as it is resistant to permanent water damage and does not need to be treated before tiling.
How thick is backer board for floor tile?
Cement-fiber, or similarly reinforced, backer board comes in standard 1/4 inch and 1/2 inch thicknesses. If you’re installing backer board over an existing subfloor, 1/4 inch is sufficient. If you’re installing backer board in new construction, attaching it directly to floor joists, opt for 1/2 inch sheets.
Do you have to put thinset between subfloor and cement board?
If you have a concrete subfloor then you should not be contemplating installing cement board over it. Not only is thinset a critical component underneath cement board but the other critical component is the fasteners. And you won’t have the fasteners if you are trying to install it over concrete.
What do you do with a gap between tub and cement board?
Technically, after the tile is installed over the backer board that gap between it and the tub ledge should be filled with an ASTM C920 sealant (caulking e.g. silicone). Although some say you should have weep holes along this gap so any water behind can weep out into the tub.
How do you fill gap between cement board and drywall?
Fill the gap between the boards with mortar using the 6-inch taping knife. Force it into the gap and apply a thin layer on both sides of the joint for a total width of 3 to 4 inches. Place fiberglass mesh tape over the entire length of the joint and smooth it with the knife.
Does it matter which side of cement board faces out?
No, it doesn’t matter. Regardless of which side faces out during installation, you can expect the same great performance that has made USG Durock® Brand Cement Board the preferred choice of professionals and do-it-yourselfers for decades.
Can I use drywall mesh tape for cement board?
Apply Mesh Tape Paper tape simply won’t hold up on cement board. Although paper tape generally leads to a cleaner finish on drywall, you can still achieve a smooth look if you use mesh tape on a drywall/cement board joint. Use this self-adhesive joint tape where cement board and drywall meet.1 day ago.
Can you use 1/2 inch cement board on floors?
Floors. Both 1/4- and1/2-inch cement board are appropriate for floors. To install cement board on floors, cement board manufacturers mandate a 5/8-inch plywood subfloor or OSB underlayment. Manufacturers also recommend bonding cement board to floors with a 1/4-inch polymer-modified thinset coating.
