Questions tagged [cement-board]

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154 views

how to extend wall board to window for narrower trim

We installed cement board on a wall to prep it for tiling. The gap between the window and the outline of the rough opening is anywhere between 3" to 3.5" (it's inconsistent). I want to install ...
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97 views

Why would there be a wooden board under cement board in tub alcove?

I'm removing the cement board to make tiling easier. I've so far removed two walls. The third wall however is the one with the shower head and controls on it. I rubbed away a bit of cement board (to ...
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711 views

Apply stucco directly to cement board

I'm fixing stucco on an old house and it appears as though they literally just added stucco onto cement board with asphalt kraft paper in between. I have to remove a piece to add in new cement board ...
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3answers
216 views

Densheild tile backer board use advise needed

I'm in the process of doing my bathtub walls and I'm thinking of using Denshield™ boards. My total area is 55 sq ft. I found 4'x8' Denshield™ sheets so I will need to buy two sheets to cover my area (...
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2answers
49 views

Taping or not unexposed wall joints

I have some joints between drywall and drywall and also drywall and cementboard that will not be exposed because they are behind cabinets. Do I still need to tape them together? Does taping provide ...
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2answers
2k views

How to Fill Gaps Between Hardibacker and Drywall?

Trying to figure this out. I am going to be using Hardibacker for wet areas around the tub-shower above the acrylic tub/shower surround, and drywall for the rest of the room. There will be no tile. ...
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3answers
11k views

can I install cement backer board over plank subfloor

I have old plank subfloor installed at a 45 degree angle to the floor joists. How should I install cbu(cement backer board) on top of this for a tile installation? The entire area is approximately ...
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1answer
660 views

Playhouse to sauna conversion

I am looking at converting my kids playhouse to a wood burning sauna. It sits about 6' off the ground on 4x4 treated posts. I have two questions abut this: The floor is 5/8" treated plywood. I was ...
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3answers
23k views

When taping cement board do I need to tape at the walls?

I am preparing to put down cement board for a bathroom tile install. I understand, I need to tape at the seams. Should I tape the edges where the cement board meets the drywall or the tub as well? ...
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1answer
32 views

Proper way to repair old plasterboard walls?

my basic question is: what is the proper material and method for repairing defects on the walls in my old house? To give context, I am in Virginia, United States and the house is a concrete block ...
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1answer
138 views

What are your drywall/cement board/framing flatness tolerances for tile supporting walls?

What are your drywall/cement board/framing flatness tolerances for tile supporting walls? I am rebuilding half of a frame and it is a challenge to bring all the studs in the same plane. I do know ...
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1answer
39 views

Taping drywall and cementboard butted together

When taping cementboard butted against drywall, is it better to use drywall (paper/mesh) tape with joint compound or cementboard mesh tape with thinset?
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1answer
49 views

How to repaint cement boards

Some of the lower boards of my 10-year old Hardie siding have become brownish. I am planning to repaint. What is the best approach? Prime it again and then paint. Or just paint? I suspect rain water ...
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1answer
500 views

Should the tiny gap between exterior window trim and the window housing be caulked?

I have a home with Hardie Board siding and trim. There is a tiny gap between the edge of the installed windows and the Hardie trim board ( Please see the gap where my finger is pointing in the picture ...
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1answer
830 views

Mudding over cement board in shower

thanks in advance for help. I'm trying to finish a shower that was in progress from a crew until we had to send them packing with the job unfinished. They installed a shower stall, with tile up the ...
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1answer
707 views

broken cement board corner

i installed a cement board with a badly crushed corner. how should i proceed? This is for a shower it will be waterproofed with redguard (or equivalent). There is studs behind the screws on the ...
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2answers
259 views

Installing Cement Board 16 inches on center

I'm going to be using cement board for the walls of my walk-in shower. My shower is framed 16 inches on center. It appears that most cement board measures 5 ft. x 3 ft. Does this mean I'm going to ...
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1answer
402 views

Vaper barrier for kerdi lined shower walls

I'm using kerdi membrane for my shower area with cement backerboard. Should I still add a layer of plastic vapor barrier behind the backerboard. Normally that's required to prevent the studs and ...
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1answer
2k views

How to attach closet flange to sub floor

I recently removed my toilet and saw that a couple tiles underneath it were cracked, and on removing those tiles found the plywood beneath the tiles had rotted out. So I removed any tiles under the ...
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0answers
18 views

waterproof shower: waterproof pan or not?

I have a question about waterproofing our shower. We have a pre-slope, then the PVC liner, then the final mud bed. We are going to use the Aquadefense liquid waterproof membrane. We installed our ...
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38 views

Installed Hardie board with tin roof

Installed Hardie board, silver side down as ceiling with tin applied as roof. Can this type of application withstand being the roof/ceiling in an outdoor kitchen with no side walls?
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0answers
28 views

How to finish joint of cement board

When cement board meets a block is expanding metal sufficient to put over the joint to stop it cracking before I scratch coat? And do I need to put scrim on the joints of the cement board as well as ...
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7 views

Mounting a Starglo SG6 NG fired ceramic infrared heater under my porch roof — using cement board attached to rafters

I've been using a succession of pedestal NG heaters for years (they wear out). I'd like to mount a Sunstar ceramic radiant heater (twin burner - 65,000 btu) beneath the roof (12 pitch, 20' floor to ...
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1answer
61 views

How do steel studs compare to traditional lumber in holding strength? [closed]

How can steel studs possibly compare to traditional lumber in holding strength? The fasteners will at best engage with a minuscule amount of metal of X wall thickness and then break through into empty ...
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0answers
63 views

What is this under the backerboard?

I am currently working on demoing our kitchen and am not sure how to proceed. I recently did our bathroom and for the floor I left the old backerboard, chiseled remaining thinset, applied a self-...
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255 views

Outdoor tiled countertop - plywood / cement backer board / both - will it be movable?

I'm building an outdoor 'workbench' for tabletop BBQing / pizza oven / gardening. The countertop will be tiled with 6mm thick, 165mm square porcelain tiles using a flexible exterior-suited adhesive. ...
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0answers
1k views

Gap between cement board and drywall

We're putting in a shower and I had originally found a tutorial that showed to leave ~1/8 to ~1/4 gaps around the cement board and drywall surround that would be filled with caulk to prevent water ...
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0answers
197 views

What to use as void filler behind between shower's studs & cement underlayment board?

I am in the middle of remodeling my bathtub/shower surround. For my tile underlayment I chose hardibacker, and the appropriate hardi screws. A youtube video series that I am using as my tutorial is ...
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68 views

Is subfloor / underlayment for tile different for a small area

Normally for plank subfloor one is supposed to add 1/2 inch of plywood plus cement backer board for underlayment. For a small area say 4 feet by four feet is all of this necessary?
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3k views

joint between cement board and existing drywall not flush — how to treat?

We're redoing a wall in our kitchen because it was too uneven to lay our countertop-to-ceiling tile backsplash. The base cabinets and countertops have been installed already, and there are no upper ...
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1answer
3k views

Can cement backer board be used to support bluestone or slate outdoor raised patio?

We are designing a multi-level stone patio. To exit the kitchen directly onto the stone patio, the highest part of that patio would be 12 inches above the foundation. The next level would be flush ...
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2answers
54 views

Best way to bore a hole in Hardieplank exterior cement board

I need to drill through Hardieplank cement fiber board for a 1” PVC irrigation pipe. Common bi-metal hole saws will be dulled from even a single hole and likely wouldn’t even complete the hole. ...

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