cement backer board is not waterproof,but water cant hurt it,even when soaked in water for months or even years

Simply so, Do you need to seal Hardibacker before tiling?

To Seal or Not To Seal

Contrary to popular thought, tile and grout are not waterproof, and some moisture will penetrate even if sealant is used. If you decide to go this route, no sealant will need to be applied on top of the backerboard, as this could trap moisture between the two layers of waterproofing.

Is Hardie backer board good for shower walls? Cement board is a good, reliable backer board that works well on both floors and walls. Keep in mind that most tile setters err on the side of caution and brush a waterproofing membrane on top of cement board when it is in wet areas like showers or tub surrounds.


37 Related Questions Answers Found

 

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.

Can you use Hardie board on shower walls?

Cement Board and a Sheet Membrane

Kerdi can also be installed directly over standard drywall in a shower because, when installed correctly, it creates a continuous waterproof barrier.

Which side of 1/2 Hardibacker faces out?

However Hardie says; Either is acceptable, but we recommend that the smooth side with the nailing pattern of every 8″ on center go up. I would think you’d want the side that has “Hardiebacker-500-1/2” Ceramic Tile Backerboard” and has the fastening pattern all over it to be the surface to tile to.

Do you need a vapor barrier behind cement board?

You still need a vapor barrier with cement board, although in this case the barrier can go behind the board. Cement board is heavy enough and breathable enough to take the moisture without a problem.

Can you skim over Hardibacker board?

Yes, HardieBacker cement backerboard is suitable for a wide range of paint coatings. We do however recommend that you plaster the board first, to ensure the best possible finish.

How thick should cement board be for 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 tape Hardibacker joints?

2 Answers. 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. If you just want to leave the corners untreated that will probably be fine, because that seam won’t split the center of a tile.

Is grout waterproof?

Can I use deck screws for cement board?

There are screws made for concrete board. Bugle head like drywall screws but they are coated to resist corrosion and have sufficient strength to support the board. The heads are larger than deck screws or drywall screws, too. Rona, HD, HH will all have them.

Does cement board need to be waterproofed?

Most concrete backerboards on the market today are not water-resistant, but all are waterproof. Since many people confuse the terms, it is a common misconception that this is the best material for use inside a shower or tub area.

How many screws do I need for cement board?

In terms of cement board screws, the size of the screw you need will vary depending on the fixture or base to which you attach the board. Cement board attached to plywood or similar underlayment will hold with only 1 1/4-inch screws; for thick or heavy metal fixtures, use 1 5/8-inch screws.

Do you have to glue down durock?

You don’t glue it down. But you DO have to put thinset under it to fill in the voids and keep it rigid. Without it, the tile WILL eventually crack.

Can you score and snap Hardie board?

The simplest way to cut cement backer board is to score the surface and snap the sheet along the scored line, similar to the way you‘d cut drywall. In fact, you can use a drywall utility knife to score backer board, but a better option is a carbide-tipped scoring tool.

How do you fasten durock?

Fasten DUROCK Brand Cement Board with 1-1/4 hot-dipped galvanized roofing nails or 1-1/4 DUROCK Brand Screws, spaced 8 o.c. in both directions, penetrating floor a minimum of 3/4. Cut 1/2 DUROCK Brand Cement Board to panel and furring strip sizes with carbide-tip scoring tool. Smooth rough edges with wood rasp.

What kind of Thinset do you use for Hardibacker?

In showers, the standard substrate is tile backer, also called cement board or cement backer board. Technically called a cementitious backer unit (CBU), well-known brand names of tile backer include Durock, Denshield, HardieBacker, and WonderBoard.

What kind of Thinset do you use for Hardibacker?

What surface do I need metal lath on? For all exterior applications, install metal lath and scratch coat on the structurally sound rigid sheathing. Note: However, for clean and unpainted concrete and masonry surfaces, stone veneer may be directly applied without use of metal lath/scratch coat.

How much does 1/2 inch Hardibacker weigh?

Weight: 2.6 lbs/sq.

Do you have to put Thinset under cement board?

You do not need to tape or thinset. The thinset you use for tiles will cover any gaps (and gaps don’t need to be filled). I suggest you lay down plywood over the planks with subfloor glue and decking screws.

Do you need to waterproof durock?

A moisture barrier is necessary with any cement board product. If you do not have plastic or roofing felt behind it, then a liquid-applied membrane is in order. Durock is indeed waterproof, meaning it is not harmed by water. But it is by no means a barrier to water.

Can you use 1/4 Hardibacker shower walls?

3 Answers. 1/4hardibacker alone is an unsuitable substrate for shower wall tile. If it were attached to properly waterproofed drywall, plywood, or plaster it would be fine. Just apply thinset mortar using the application technique recommended by the mortar (and/or tile) manufacturer.

Do you put cement board on ceiling?

No, you should not be using drywall screws. Drywall screws can corrode from presence of portland cement and lime in mortar and CBU. There are screws that are specially coated to be used with the cement board.

Is Hardie board fireproof?

Yes, HardieBacker® 1/4″ Cement Board is deemed noncombustible when tested to ASTM E 136 and can be used in conjunction with other noncombustible materials around a fireplace. This does not mean that clearances to combustible building materials can be reduced by using HardieBacker 1/4″.

How do you cut and install cement board?

Lay your cement board flat, and draw a line with a carpenter’s pencil where you intend to cut. Then, place a straightedge along the line and drag either a drywall utility knife or a scoring tool against it. Repeat your cuts two to three times to make them deeper, which will make snapping the board easier.

How do you cut and install cement board?

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.

How thick is Hardibacker board?

Cement backer board comes in two standard thicknesses, 1/2 inch and 1/4 inch. The industry standard is to use 1/2-inch-thick backer board on wall tile installations, such as a tub surround.

How do you transition from cement board to drywall?

The joint between cement board and greenboard is similar to the joint between two pieces of cement board or two pieces of drywall.
  1. Plan the installation so the last column of tiles overlaps the joint between the cement board and the greenboard if possible.
  2. Mix the thin-set mortar according the instructions on the bag.

How do you seal durock?

How to Tape Durock Joints
  1. Wipe dust and debris from the joints between the Durock panels.
  2. Cut fiberglass mesh tape to fit in a single layer over every joint where the panels meet, but do not overlap the tape.
  3. Mix powdered latex-reinforced cement mortar with water as directed on the package in a clean plastic bucket.

Do you Thinset under Hardibacker?

You do need the thinset under the backerboard, you do need the 1/8″ gaps between the sheets (and 1/4″ around the perimeter) and you do need the tape and thinset on the seams. If your tilesetter refuses to correct his mistakes, ask him to leave, and be firm.

Can you use drywall screws on cement board?

The joint between cement board and greenboard is similar to the joint between two pieces of cement board or two pieces of drywall.
  1. Plan the installation so the last column of tiles overlaps the joint between the cement board and the greenboard if possible.
  2. Mix the thin-set mortar according the instructions on the bag.

Is Durock cement board fire rated?

The exact fire rating of Durock is dependent on the other materials used during construction, but a panel 1/4 or 1/2 inch thick typically provides an additional hour of fire protection.

Does Hardibacker absorb water?

No, you should not be using drywall screws. Drywall screws can corrode from presence of portland cement and lime in mortar and CBU. There are screws that are specially coated to be used with the cement board.