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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.
How do you install backer board before tiling?
The backerboard should completely cover the subfloor joints. Do a dry run and lay the backerboard down to fully cover the area you plan to tile. If needed, cut the backerboard to fit in small spaces or around obstructions. Score the board with a utility knife, then cut it using a jig saw with a carbide blade.
Do you need to seal backer board before tiling?
Contrary to popular thought, tile and grout are not waterproof, and some moisture will penetrate even if sealant is used. However, if you choose to use concrete backerboard, which is much stronger and more durable than gypsum board, a water vapor membrane must be placed underneath it or a sealant applied on top of it.
Can I just screw down cement board?
Screw and Joints Do not use drywall screws as they are not recommended to be used to hold the backer board in place. All of your backer board pieces should be cut before they are placed on the floor. It is important to highlight that screws shall not be installed all the way down to the floor joists.
How thick should thinset be under Backerboard?
How much thickness will thinset add? The thin set under the backer board may account for about 1/16″. The bond coat for the tiles about 3/32 – 1/8″. Your best bet is to use 1/4″ which should end up being 5/16″, standard thickness tiles can average about 3/8″ installed, plus or minus.
How long before you can walk on backer board?
However, after you mount the backer board to the floor you simply have to seal the seams with mortar and wait until the mortar dries. This is normally 12 hours but may be up to 24 hours in some cases. After the mortar is dry the backer board is ready to receive the mortar for the tile.
What do you do with a gap between tub and cement board?
Ideally, you would leave a 1/8 inch gap which would then have the sealant applied to it. Either stopping the cement board above the tub flange or alternately shimming it out and dropping it down near the tub would both be good options.
Does backer board go over drywall?
Because cement board can be used either for floors or walls, the surface below the cement board will vary: In such wet areas, never install cement board directly over drywall or green board. Instead, first, remove the existing surface material, then install the cement board over the studs and membrane, as applicable.
Can I tile straight onto floorboards?
Can you tile on wood floorboards? Good news, yes you can! Tiling over floorboards is possible with the use of plywood or backer boards. Directly tiling onto floorboards isn’t usually recommended as movement beneath tiles could result in unwanted cracks and breakages.
Should you wet cement board before tiling?
A. To be more precise, I’ve installed lots of concrete backer board for years, all with good results. The concrete is unaffected by any water that manages to get behind the ceramic tile. If you use cement backer board, you have to install a separate moisture barrier between the board and any wood it’s attached to.
Do you have to tape Hardibacker joints?
For tile backer boards such as Durock, Wonderboard, Hardiebacker, Permabase, and others the seams between the board need to be treated with 2-inch alkali-resistant mesh tape.
Which side of cement board faces out?
Cement board has a smooth side and a rough side. Face the rough side out if you will be using thin-set mortar adhesive to install the tile but the smooth side out if you will be using latex mastic.
Can I tile directly on Hardibacker?
HardieBacker can take up to 200kg of tile hanging weight per m2 so almost any tile can be fixed. Screws should remain 100mm from the top and bottom edges and 50mm from the left and right edges. Ensure you do not overdrive the screws and the screw remains flush with the front of the board.
Do I need a vapor barrier behind Hardibacker?
Hardibacker doesn’t need a vapor barrier or waterproofing except you do need to tape and thinset the joints.
Do you need to use RedGard over cement board?
You really don’t need the RedGard, but the more protection the betterso go for it. And yes, you can do the boards beforehand. But, hit the filled seams & screws (your weak points) as soon as a panel is ready to give it some time to setup. You’ll have to wait for the fills to dry or at least setup anyway.
Can you use drywall screws on cement board?
You don’t want to use regular drywall screws for cement boards. They can corrode, they can break down the edges of the boards, and they won’t drive in flush properly. Use ITW’s ROCK-ON and BACKER-ON screws instead.
Can you install cement board without thinset?
Installing cement board over a concrete subfloor. 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 kind of thinset goes under cement board?
An unmodified thinset (Masterblend) is fine between the Hardi and the subfloor. Tara, 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.
What happens if you use too much thinset?
When the mortar isn’t properly troweled, it creates unsupported space under the tiles which become weak spots that can be easily damaged by the same impact or heavy loads. The best way to avoid these issues, avoid tile breakage, and create a strong tile assembly is to follow the following three steps.
