Table of Contents
Does it matter which way you install cement board?
Screw the board in place 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.
Which side of Durock cement board goes up?
The smooth side is ideal for mastic applications, as it increases adhesive coverage. The textured side is ideal for mortar applications, as it enhances bonding and reduces tile slip. That said, mastic or thin-set mortar can be used on either side of the board without compromising performance.
What goes under durock?
Subfloor should be minimum 5/8″ APA span-rated plywood or OSB with an Exposure 1 classification or better. Minimum 3/4″ APA span- rated plywood or OSB with an Exposure 1 classification or better. Cover base with USG Durock™ Brand Tile Membrane, 15 lb. felt or 4-mil polyethylene and attach with 1/4″ galvanized staples.
Do you need special screws for Durock cement board?
A. DUROCK Wood Screws are used for applying 12.7 mm (1/2) and 15.9 mm (5/8) DUROCK Cement Board to subfloors and counter tops or 12.7 mm (1/2) DUROCK Cement Board to walls or ceilings. DUROCK Steel Screws, 42 mm (1-5/8) long, are used for applying 15.9 mm (5/8) DUROCK Cement Board to walls or ceilings.
What do you do with a gap between tub and cement board?
Technically, after the tile is installed over the backer board that gap between it and the tub ledge should be filled with an ASTM C920 sealant (caulking e.g. silicone). Although some say you should have weep holes along this gap so any water behind can weep out into the tub.
Should I put thinset under cement 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.
Do you tape durock seams?
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.
How far apart are screws in durock?
Fasten panels to subfloor while the adhesive is wet with 32 mm (1-1/4″) CGC Durock Wood Screws or 38 mm (1-1/2″) hot-dipped galvanized roofing nails spaced 203 mm (8″) o.c. in both directions.
Do you need to tape cement board before tiling?
If you are going to tile over the cement board, you should tape the seams. This should not be that difficult. Pack in thinset, lay on the tape, and flat-knife to get it set in. In the corners, use a corner knife.
Can you tile directly over durock?
There is no need to install backer board on a concrete substrate—ceramic tile can be applied right over concrete, provided the surface is flat, smooth, and free of significant cracks.
Will mortar stick to durock?
Just a spritz of water on the Durock before you apply the cement usually helps it stick. And if you use a finishing trowel and REALLY smear a thin layer of cement on the Durock right before you butter up your stone/brick and install it, it’ll stick really good.
Can I 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.
What Thinset do I use for 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.
Does cement board sit on tub?
The best approach when installing cement board or other tile backer around a tub is to keep the cement board out of the lip area. above the lip of the tub. Then apply a generous amount of thin-set to the bottom bathtub tile and position it 1/8 in.
Does durock need to be waterproofed?
Should USG Durock® Brand Cement Board Panels be waterproofed in wet area use? Water does not affect USG Durock® Brand Cement Board, however, TCNA guidelines recommend the use of a waterproof membrane in wet areas.
Do you leave a gap between cement board?
Leave a 1/4-inch gap between the backer board and the wall. Leave a 1/8-inch gap between each backer board sheet. The corners and edges of the sheets should not touch one another.
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.
