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. Proper installation would be to follow the manufacturers installation instructions for applying cement board
Cement board
A cement board is a combination of cement and reinforcing fibers formed into 4 foot by 8 foot sheets (or 3 foot by 5 foot sheets), 1/4 to 1/2 inch thick that are typically used as a tile backing board. Cement board can be nailed or screwed to wood or steel studs to create a substrate for vert…
Do I really need thinset under backer board?
Thinset is absolutely required beneath backer-board on a floor. Also, backer-board provides no structural strength at all. You can not install it directly over a 1x subfloor; that is way too thin and will deflect. It does not sound as if you have a quality-minded contractor.
Should I use thinset under backerboard?
/5 Ways to Screw Up your Cement Board Installation on Floors
- No Thinset underneath the backer board. Just the other day, I saw a video featuring someone fastening Hardibacker directly to the subfloor with nothing underneath it.
- Not Staggering the Seams. Now, this is an area that the plywood installers will be familiar with. ...
- Fasteners. ...
- Not using Mesh Tape on the Seams of your Cement Board Installation. ...
What do you need to know about thinset or mortar?
Supplies for mixing thinset
- 5 gallon bucket
- Power drill (plug in, not battery powered)
- Mixing paddle
- Thinset mortar (be sure to get the right kind for your tile & application)
- Water source (outside hose works great)
Do I need thinset under cement board?
Using a skim coat under cement board is a step that many contractors often skip. However, many manufacturers, including Durock and Hardiebacker, not only recommend that you use Thinset under their backerboard, they also specify it and will void their product warranty if not used.
Is it necessary to use thinset under Hardibacker?
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.
Do I need thinset under Backerboard?
Use thin-set mortar when installing cement backer board. Thin-set dries slowly, allowing you to fix and readjust backer board sheets as needed. The ingredients in thin-set mortar ingredients are cement, fine sand and a water retaining agent.
What thinset do I use under Hardibacker?
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.
How thick should thinset be under Backerboard?
Plan for a layer of thinset 3/16-inch to 1/8-inch thick beneath your tile. A 3/16-inch layer of thinset will be enough for tiles with a smooth back to bond the tile to the floor or backer board.
Can I just screw down backer 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. Along the perimeter, screws should be installed at least ½ inch from the edge, but no more than 2 1/4 inches.
Can you put Hardie board over plywood?
0:114:30How to Install HardieBacker Cement Board on Floors - YouTubeYouTubeStart of suggested clipEnd of suggested clipParty backers cement board strength and durability make it perfect for use on floors. We recommendMoreParty backers cement board strength and durability make it perfect for use on floors. We recommend our quarter-inch cement board for this purpose. Before getting started you'll need to have the right
Can you use thinset on Hardie board?
Since you are putting down hardie board on boards with small gaps, I would not recommend trying to put down thinset under it. It will make an enormous mess under the house (or whatever is under your bathroom). It is also more likely to make the floor uneven since it is hard to level thinset that is separated by gaps.
How do you apply Hardibacker to thinset?
4:4010:27HardieBacker installation - YouTubeYouTubeStart of suggested clipEnd of suggested clipApply a layer of thin set on the subfloor. Using your trowel. Then embed hardi backer cement boardMoreApply a layer of thin set on the subfloor. Using your trowel. Then embed hardi backer cement board firmly and evenly in the wet thinset. Fasten the boards into the floor.
What kind of thinset goes under cement board?
The cement board is then screwed into the plywood while the thin-set is fresh/wet. MAPEI recommends the use of MAPEI Porcelain Tile Mortar, MAPEI Large-Format Floor & Wall Tile Mortar or MAPEI Large Tile & Stone Mortar as thin-set under the cement board.
Why tape a Hardibacker seam?
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.
How much depth does thinset add?
The terms thinset cement, thinset mortar, dryset mortar, and drybond mortar are synonymous. This type of cement is designed to adhere well in a thin layer - typically not greater than 3/16th thick. For example, a 3/8" notch trowel will produce a 3/16th inch thick coating after the tiles are pressed in to the cement.
How long does it take for thinset to dry under Hardibacker?
We will be using thinset and nails to put our hardibacker board down. My question is that the manufactuer says that we must allow the thinset to dry for 24 hours before you can install the tiles.