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.

Accordingly, how much thinset do you put under Hardibacker?

This is probably because at one time the installation instructions for Hardibacker called for 3/32″ inch of thinset underneath. Currently, Hardibacker calls for either 1/4″ thinset, or 5/32″ mastic underneath. I always use 1/4″ trowel for all my underlayment and 3/8″ for almost all my tile.

How do I attach cement backer board to plywood?

Position each piece of backer board in the thin-set, press in place, and attach using special backer board screws on the spacing recommended by the backer board manufacturer. Cover the joints in the backer board with fiberglass tape embedded in thin-set adhesive and allow to set before tiling.

Can you put Thinset on plywood?

While you can lay tile directly over a concrete slab using thin-set adhesive, don’t make the mistake of applying tile directly to a plywood subfloor. No matter how firm the subfloor; the plywood will expand and contract at a different rate as the tile, causing cracks to develop in the grout lines or tiles over time.

Can I just screw down cement board?

Just screw the floor down with 1-5/8 in. drywall screws spaced every 6 in. Vinyl flooring glued over 1/4-in. underlayment.

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Consequently, how do you apply thinset under Backerboard?

Scoop up thinset on the flat edge of a 1/4-inch, square-notched trowel and spread the thinset across the plywood. Cover an area large enough to place the first backer board sheet. Apply another layer of thinset over the first, using the square-notched edge of the trowel.

Which side of Hardibacker board goes down?

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.

Should you put cement board under a tub?

You don’t need any cement board under the tub. It is far more important to have a sturdy layer of ply under the tub.

How do you install cement backer board on the floor?

backer board


What is the difference between modified and unmodified thinset?

Unmodified thinset has been around forever. Unlike unmodified mortar, which consists only of a blend of Portland cement, sand, and water retention agents, modified thinset includes additional retention products, such as latex polymers, which can increase its performance and strength.

Is Thinset needed under Hardibacker?

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 long does it take for thinset to dry under Hardibacker?

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.

Can you tile directly over Hardiebacker board?

Cement board, commonly sold under trade names such as Durock, Hardiebacker, and WonderBoard, is now the standard underlayment used for ceramic, porcelain, or stone tile laid with thinset mortar adhesive. Ceramic tile laid over cement board is one of the most durable floor or wall surfaces you can install.

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Can you use 1/4 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. They also require a 3/4-inch subfloor where tile size exceeds 12 inches.

How do you lay backer board on a subfloor?

  1. Introduction. Check the Area.
  2. Lay the Backer Board. Lay the backer board in a “brickwork” type pattern-meaning that sheets are offset.
  3. Apply the Mortar. Using a notched trowel, apply a leveling bed of thinset mortar over the subfloor and embed the backer board sheets into the adhesive.

Can you walk on cement board?

You need to fasten the backer-board before the mortar sets up underneath, so walking on it while it’s wet isn’t a problem.

How thick can Thinset be under tile?

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.

What happens if Thinset is too thin?

However, it does meet the minimum requirements of A118. 1 for unmodified thinsets, so, it should work. Since you mixed it too thin and spread it with the wrong trowel, it will take longer to set up. BUT, mixing it too thin also makes it weak.

Can you tile straight onto Hardibacker?

The Hardibacker will be fine to tile straight onto.

Do you have to put cement board under tile?

In short, tile and grout are not inherently waterproof. Cement backer board is often used as a tile base on plywood or OSB subfloor. Cement backer board on concrete as a subfloor or underlayment is usually not recommended or needed. In most cases, you can apply tile directly to the concrete.

Similarly, what kind of Thinset do you use for Hardibacker?

To save a few bucks, you can use dry-set mortar under Hardi, but if you want to simplify things and deal with only one thinset, use a modified thinset like 253 Gold for both applications. Rialto is a porcelain tile that has deep depressions on the back.