Backer board by the numbers
Backer board by the numbers Weights range from 2.4 pounds / sq ft to 3.0 pounds / sq ft for the ½” thick stock. That relates to 36 pounds for the lighter weight Durock and 45 pounds for the WonderBoard. HardieBoard is in between at 2.6 pounds sq ft or 39 pounds for a 3 x 5 foot sheet.
Additionally, what is cement backer board made of? Also called a cementitious backer unit or CBU, backer board is 100 percent inorganic, consisting of cement, water, silica, limestone flour, and fibers such as Kevlar or fiberglass for strength.
Also question is, what is the thickness of cement backer board?
Cement Board Thickness 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.
Which side of cement backer board goes up?
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.
Is Hardie backer waterproof?
cement backer board is not waterproof,but water cant hurt it,even when soaked in water for months or even years
How much does a sheet of 1/2 durock weight?
Specifications Actual Thickness (Inches) 0.5 Weight (lbs.) 36 ASTM C1288 Compliant No ANSI A118.9 Compliant No Warranty Limited lifetime
How many screws do I need for cement 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. In general, 1 1/2-inch galvanized nails will hold the board firmly in place.
What kind of screws do you use for Hardibacker?
Cement Board Screws are designed for attaching HardieBacker or equivalent fiber cement backerboard to wood or light gauge steel studs. Backer-On’s patented serrated head design countersinks for flush seating at any angle, providing a smooth surface for tile.
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 many screws do you need for a Hardibacker sheet?
Fasten a minimum of 12 screws into the board (4 rows of 3 screws). Keep fixings between 15mm from board edges and 50mm from board corners.
Is Hardibacker the same as cement board?
They are very different materials. Hardibacker isn’t as fragile as Durarock or the other cement boards. Sorry but I am correct in that Hardi-Board is a Brand name and Cement Board is also a description of the composition of Hardi Brand product.
Is concrete backer board flammable?
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″.
Do you need to tape cement board before tiling?
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.
Can you use drywall screws for cement board?
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.
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. By having the vapor barrier behind the cement board you stop the moisture going further into the wall.
Can I put tile directly on drywall?
Sheetrock, or drywall, is no different for tiling over than wood, plaster, cement, or other wall materials. If you are tiling an area that is not in a bathroom, tiles can be applied directly to the sheetrock simply and easily.
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.