Questions tagged [cement-board]

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14 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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36 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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27 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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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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2answers
52 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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1answer
102 views

How should I transition between cement board floor and alcove tub?

Remodeling a bathroom and about to put in the floor. I have a plywood subfloor, and I'm about to install 1/2-in cement board on top, bedded in modified thinset spread with a quarter inch notched ...
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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
115 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
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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2answers
372 views

Drywall or cement board in gap between bathtub and corner

So, I’ve about installed all the cement board for my bathroom tile renovation around the 3 sides of the tub. There is approximately a 2” gap between the corner of the room and the bath tub. For the 2” ...
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1answer
35 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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3answers
235 views

Horizontal blocking behind cement board necessary on edges(wonderlite specifically)

Using wonderlite cement board in my tub area surround, instructions say all edges supported? but almost every instruction video including their own doesn't show any backing behind the edges where the ...
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43 views

HardiePlank Lap Siding and Trim Questions

I’m looking at doing my first project with HardiePlank Lap Siding and Trim on my house.  I’ve read the technical documentation and overall it looks like it pretty strait forward to install.  This ...
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152 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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1answer
112 views

Taping cementboard with mastic

In the past, I have mesh taped cementboard with thinset. Is it okay to do it with mastic instead? The reason I would prefer it is to avoid mixing thinset in my own tub, as opposed to the container the ...
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2answers
32 views

Underlayment for using porcelain tile outdoors?

Rebuilding an outdoor deck in upstate NY with 6" X 24" porcelain tile. The foundation will be a 6" concrete bed with rebar. Confused about the need for and the order in which the ...
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1answer
77 views

Replacing old tile kitchen with wall

My basement kitchen wall is adjacent to the bathroom and shower. I want to replace the old tile in the kitchen with a straight wall, which I’m planning to paint. I have removed the old tile and ...
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1answer
317 views

Cement board under cabinet with no tile

In my basement apartment, I had concrete underlayment and I decided to not install tile under the cabinets even though some people advised me to do. It turned out well especially because I ended up ...
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1answer
100 views

What wall cladding should be used along the floor of the garage?

I have an attached garage on a house with a wood foundation in Minnesota, USA. The garage is not temperature-controlled. On a roughly three foot long exterior wall, I discovered the drywall was ...
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3answers
236 views

Can I glue instead of screw a 3/4” strip of cement backer board?

I am building a shower. The entrance is framed by 2x4s. On the outside of the shower there is drywall butting up against the 2x4. So, there is only enough room for a 3/4” strip of hardibacker. I’ve ...
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1answer
44 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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3answers
161 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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1answer
425 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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2answers
950 views

Epoxy over cementboard

I have achieved fantastic results applying epoxy over the concrete floor in my basement apartment. I am currently doing the kitchen in my main unit. My preferred flooring choice is stone tile ...
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3answers
117 views

Tile on OSB substrate in bedroom

A lot of information online about laying tile is specific for bathrooms (that need waterproofing), but in this case I want to remove carpet from a bedroom that is used as office space. This carpet is ...
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2answers
375 views

Can I use mortar to transition a height difference between cement board and drywall?

A family member helped me install some cement board in my shower, but the cement board and drywall aren’t level. It already has two coats of red guard and is basically ready to tile. Can I use thin ...
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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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1answer
588 views

Accidental drywall mud over cement board

I have a wall in my kitchen being built that will have some drywall and some tile. A dude I hired to finish my drywall, while I wasn't supervising him, applied some drywall mud over the cementboard. I ...
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0answers
184 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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1answer
471 views

Does the side of Hardibacker cement board really matter?

I saw somewhere that the rough side should face out in case of thinset and smooth in case of mastic. I hung some boards randomly before knowing so some smooth sides are facing out and I'll be using ...
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1answer
3k views

Is cement board a better soundproofing material than 5/8 drywall?

Cement board has a higher density than 5/8 drywall. It also probably, and this is just a guess, probably has a lower resonance as well (being cement), so less sound should get through. 5/8" drywall ...
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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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1answer
174 views

Delineation between drywall and cementboard

This is the sink/dishwasher bay for my basement apartment. There will be a bottom and a top cabinet, corresponding approximately to below and above the green line. I want to put tile on the wall ...
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1answer
6k views

What is the best board to install behind a glue up tub surround?

I would think it would make sense to install a waterproof board like GoBoard or DensShield behind a fiberglass tub surround, but I can’t find an adhesive that specifically states that it is compatible ...
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1answer
323 views

What size should I cut my backer board?

I am hanging backer board for my shower and have a 5'x 3'2" tall space I need to cover. The backer board comes in 5' x 3' sheets. My question is should I Use one full sheet and then cut another ...
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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
2k views

How to correct burying cement board into shower pan concrete?

I made the big mistake of burying my cement board (Hardiebacker) into the concrete of my shower pan. I now understand the risks with water wicking up into my concrete boards, and causing a moisture/...
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1answer
3k views

Patch Hole In HardiPlank Fiber Cement Siding

I have a hole in the siding of my home. The siding is HardiPlank fiber cement. The hole size (diameter) is that of a cable line. A cable line was run through the siding when the previous home owners ...
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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
2k views

Do I need to install cement backer board on the wall above a tile shower surround?

We removed a tub wall surround and want to replace it with tile. We don't plan to tile to the ceiling. Can we cut out only the drywall where the tub wall was and replace that with cement backer ...
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1answer
5k views

How much does a pallet of durock 1/4" cement board weigh?

I am trying to figure out if I will need to make separate trips for my thinset mortar and cement board to keep within the safe operating limits of my vehicle's maximum load weight. I plan on buying ...
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1answer
789 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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2answers
11k views

How to join seams between hardiebacker and drywall in a corner?

I'm tackling a full bathroom drywall install for the first time and trying to make sure I don't make any unfixable mistakes. I am at the taping/mudding stage. Based on my understanding, I can use ...
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0answers
66 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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3answers
10k 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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2answers
2k views

Drywall/Cement board transition for a tub surround

I am remodeling my bathroom, and intend to replace my bathtub and surround. I have started ripping the 5/8 in. drywall from around the bathtub, and I intend to install a cement board and tile all the ...
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1answer
672 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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1answer
103 views

tearing out tub/shower surround

I live in Vancouver, and my condo is about 25 years old. A couple of the tiles in the tub/shower surround are cracked, and I know that when I take them off I'm going to find soggy drywall. I'm ...
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2answers
2k views

Can I use Kerdi Board instead of Cement Board to thinset natural stone tile?

I've got these split face natural stones that come in 24 x 6 panels, and I was going to install them onto Cement Board using thinset. Checking the boards out (Permabase Plus), they contain silicates ...