Best answer

Once the subfloor of proper thickness is properly installed then you can apply cement board directly to the subfloor material. ALL CEMENT BOARDS MUST be installed in a fresh bed of thinset. ... If you want the cement board under the shower tray then do so - doesn't matter.

Answered by: Anna Koskinen Date created: Jun 26, 2022

Do I need a vapor barrier behind cement board in shower?

Asked By: Guerric P Date created: Jun 23, 2022

Moisture barriers stop that water or vapor from getting any farther and potentially rotting your studs, the drywall or greenboard installed behind the enclosure. They are required beneath your shower pan and behind your shower walls.

Answered By: Daniel Storm Date created: Jun 26, 2022

Do you have to waterproof cement board?

Asked By: aminrd Date created: Jun 11, 2022

Most concrete backer-boards 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.

Answered By: Jason Swett Date created: Jun 11, 2022

Can you paint cement board in shower?

Asked By: Davor Lucic Date created: Jun 17, 2022

Can you paint cement board in shower? Not likely. but Hardie backer board's official installation tutorial says it can be finish with paint. Use the backer board on the tiled part, and use the moisture resistant drywall on the rest.

Answered By: Tim Cooper Date created: Jun 18, 2022

Do you have to use thinset under cement board?

Asked By: askewchan Date created: Jun 13, 2022

No Thinset underneath the backer board “The thinset goes ON TOP of the cement board to stick the tiles!” ... Cement board is a different product and it needs to be installed in its own way. Additionally, screws don't take the place of thinset either.

Answered By: cirrus Date created: Jun 14, 2022

Do you need to waterproof cement board in a shower?

Asked By: anmol.majhail Date created: Jun 10, 2022

Cement board is not waterproof. Hardibacker is not waterproof. Tile and grout are not waterproof. Cement board will not fall apart when exposed to water.

Answered By: Melchia Date created: Jun 13, 2022

Do I need to waterproof cement board in shower?

Asked By: thecOdemOnkey Date created: Jun 24, 2022

Here's what the TCNA handbook has to say about the matter: “A waterproof membrane or vapor retarder membrane must be specified to prevent moisture intrusion and protect adjacent building materials.” ~B412 Bathtub or shower with prefabricated receptor. Cement board or Fiber-cement board.

Answered By: ARK1375 Date created: Jun 27, 2022

Can you use cement tiles in a shower?

Asked By: aromero Date created: Jun 21, 2022

The most common question is, "Can I use them in my shower or bath?" The answer is definitely, "Yes!" Cement tiles can also be used in wet areas such as the bathroom floor, shower floor, shower wall, steam room or sauna.

...

However, do not confuse encaustic cement tile with encaustic tile..

Answered By: thkala Date created: Jun 23, 2022

Do you need plastic behind cement board?

Asked By: Amsakanna Date created: Jun 24, 2022

Their online instructions/diagrams show no use of a vapor barrier. You should, so that any moisture that gets behind the cement board runs into the tub or shower instead of into your wall cavity (causing rot or mold/mildew).

Answered By: Rickard Elimää Date created: Jun 25, 2022

Do you need to put a vapor barrier behind cement board?

Asked By: kevnk Date created: Jun 14, 2022

You should NOT place a vapor barrier BEHIND the backer board. Where, pray tell, would any such collected vapor/water go? Answer:There's nowhere proper for such moisture to egress. The current best practice is to place waterproofing OVER the backetboard and just UNDER the tile.

Answered By: Alix Axel Date created: Jun 14, 2022

Is Thinset under cement board necessary?

Asked By: missingfaktor Date created: Jun 19, 2022

Not only is thinset a critical component underneath cement board but the other critical component is the fasteners. And you won't have the fasteners if you are trying to install it over concrete.

Answered By: jwezorek Date created: Jun 19, 2022

Related Question Answers

EJBEAN

Professor

What do you put behind cement board in shower?

Cement Board and a Liquid Membrane No plastic sheeting goes behind the cement board.

A liquid waterproofing membrane, such as RedGard or Hydro Ban, is applied to the cement board and allowed to cure.

Then, tile is installed over the membrane..

troelskn

Professor

Is backer board the same as cement board?

Cement backer board is also called cement board, and it's the most commonly used backer board for all manner of ceramic and porcelain tiles. Made of cement and reinforced on the top and bottom with fiberglass, this waterproof backer board is generally used for tiled shower surrounds and floors in wet areas.

paxos1977

Professor

Can you use cement board in a shower?

In showers, the standard substrate is tile backer, also called cement board or cement backer board. Ceramic and porcelain tile, more than almost any other surface material, needs a stable, flat, flex-free substrate. Even the slightest amount of movement in a building structure can telegraph to the tile and crack it.

Laurence Gonsalves

Professor

Can I use concrete for shower pan?

Concrete is perfectly adequate, if not recommended, for use as the shower pan base for materials such as stone, tile or mosaic tile to be used as the finish surface (as long as there is a proper membrane between the concrete and any vulnerable surrounding material).

Jean

Professor

Can you glue stone veneer to cement board?

What can I put stone veneer on for an interior application? For interior applications, stone veneer can be installed over cement board, drywall, and all of the above.

ARK1375

Professional

Can you put cement over silicone?

Yes, silicone will stick to cement board.

In fact I highly recommend that you use cement board such as 'Durock' as your backer board.

Use proper screws.

Such as the specific cement board screw..

Netwave

Professional

How do you cement a toilet bowl?

HOW TO USE SAND & CEMENT TO SET A NEW TOILET PANPREPARE FOR THE MORTAR BASE. Carefully mark the outline of the area to be covered by the toilet pan. ... MIX THE SAND & CEMENT. Add one 20kg bag of Sand & Cement to a large bucket and add 3.5 litres of clean water. ... FORM A MORTAR BED. ... SET THE PAN ON THE MORTAR BED. ... FINISHING OFF.

erenon

Professional

Can you use cement board for 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..

Isac Moura

Professional

Can you use concrete in a shower?

Concrete is perfectly adequate, if not recommended, for use as the shower pan base for materials such as stone, tile or mosaic tile to be used as the finish surface (as long as there is a proper membrane between the concrete and any vulnerable surrounding material).

John Ruddell

Professional

Do I have to use cement board under Wall Tile?

In short, tile and grout are not inherently waterproof. ... Cement backer board is often used as a tile base on plywood or OSB subfloor. Cement backer board on concrete as a subfloor or underlayment is usually not recommended or needed. In most cases, you can apply tile directly to the concrete.

Guillaume Vincent

User

Do I need a shower pan liner on concrete floor?

JRC3 Member.

It will need to be lined or it will wick into the slab and studding.

The liner also makes the walls around the pan water-tight, that's why the liner normally goes up at least 3" above the pan behind the tile and backer material.

Moisture gets behind the wall tile and is eventually caught by the liner..

Gerry P

User

Do I need a shower pan on concrete floor?

You will have to ensure that there is no wax, oil, grease, or soap scum on the face of the concrete slab that could ruin or reduce the bond. After that, I recommend that you install a sloped shower pan to contain the shower water and prevent harmful organisms from becoming resident in the surrounding walls and floor.

Josh Habdas

User

Do you have to replace cement board under tile?

Undamaged cement backer board does not need to be replaced.

...

It is difficult to remove tile from a cement backer board, and even more difficult to avoid damaging the board in the process.

Since backer board is relatively inexpensive, it's not normally worth the time and labor it would take to remove the tile to save it..

Yves M.

User

Do you install cement board before shower pan?

The wallboard must be installed 1/8 inch above the shower pan. If the shower pan is not in place, the wallboard height must be guessed, which can lead to inaccuracies and an expansion gap that is too large or too small.

Konrad Dzwinel

User

Do you need a shower pan liner on concrete floor?

JRC3 Member. It will need to be lined or it will wick into the slab and studding. The liner also makes the walls around the pan water-tight, that's why the liner normally goes up at least 3" above the pan behind the tile and backer material.

Luis Miguel Mejía Suárez

Guest

Do you need plywood under cement board?

The Surface Below the Cement Board Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB). ... In such wet areas, never install cement board directly over drywall or green board.

Fabrizio Valencia

Guest

Do you need Thinset under cement board?

Not only is thinset a critical component underneath cement board but the other critical component is the fasteners.

And you won't have the fasteners if you are trying to install it over concrete..

GorvGoyl

Guest

Does cement board go over lip of shower pan?

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.

Apply it to the wall with the bottom edge about 1/4 in.

above the lip of the tub.

...

Fill the gap between the tile and the tub with caulk..

hilberts_drinking_problem

Guest

Does cement board need to be sealed?

While you don't always need to seal backer board, it sometimes make sense to do so. If you are installing backer board in an area that will be subject to a great amount of moisture, like in a shower, then it makes sense to put a waterproofing sealer on it.

Luchian Grigore

Guest

Do I need cement board for kitchen backsplash?

But for a tile backsplash, if your wall is good and plumb, without any major ridges or problems, you don't always need to use a backer board, often you can just apply thinset to the walls and put your tiles in place.

Naftali aka Neal

Guest

Does cement board in shower need waterproofing?

“A waterproof membrane or vapor retarder membrane must be specified to prevent moisture intrusion and protect adjacent building materials.” ~B412 Bathtub or shower with prefabricated receptor. Cement board or Fiber-cement board. Ceramic Tile. ... Consult local building code for moisture barrier requirements.”

Alessio Popovic

Guest

Can you put footings under concrete slab?

edit - To put footings under the slab, you can cut holes wherever needed, excavate for footings (Sonotubes or concrete piers or similar) and then patch the concrete slab.

Adriano Carneiro

Guest

Do I need plywood under cement board?

Because cement board can be used either for floors or walls, the surface below the cement board will vary: Flooring: For ceramic tile floors, the cement board usually rests on a plywood subfloor (minimum 5/8-inch-thick exterior-grade plywood or OSB).

Alireza

Guest

Do you have to put Thinset under cement board?

No Thinset underneath the backer board “The thinset goes ON TOP of the cement board to stick the tiles!” ... Cement board is a different product and it needs to be installed in its own way. Additionally, screws don't take the place of thinset either.

Florent Morselli

Guest

Should I put Thinset under cement board?

Embed the cement board in latex-modified thin-set mortar The main reason for using thin-set between the cement board and the subfloor isn't as much for bonding as it is for even, void-free cement board support throughout the floor. ... Then spread thinset mortar with the flat side of a 1/4-in.

pyon

Guest

Should you put 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.

Zeitounator

Guest

What do you put on seams of cement board?

Use special mesh tape on seams Cut drywall to fill in between the existing wall or ceiling and the cement board. Screw the drywall to the studs. Cover all of the corners, joints and seams, including the joint where drywall and cement board meet, with the fiberglass mesh tape.

Pascal

Guest

Is Durock cement board non-combustible?

This DUROCK® cement board is a non-combustible, water and mold-resistant panel designed for use under tile, in shower areas, and readily applied over ...

instanceof me

Guest

Do I need cement board for shower ceiling?

It can be, but it's not really necessary. You can tile directly to drywall in any dry area. If your doors go all the way to the ceiling, you might consider cbu verses any kind of drywall on the ceiling, otherwise, it is considered a dry area.

Collin Jackson

Guest

Can you use concrete mix for shower pan?

The best mortar for a shower pan is a mix of standard cement mix with sand and Portland cement.

...

A mortar mix provides the best base because it's very shapable, allowing the owner to fit whatever type of shower or bath pan into the supportive base..

miku

Guest

Can you caulk cement board in shower?

In the event the caulk seal between the bottom row of tile and the tub/shower fails, water can get behind the tile. If the backer board is touching this ledge, it will readily soak up this water like a sponge. ... Then, before installing the tile, apply a bead of pure silicone caulk between the backer board and the ledge.

Pekka

Guest

Do you have to glue down cement board?

You cannot put a cement backer board over that. You need to put a layer or plywood, minimum 5/8 IIRC, over those boards, then mortar the backer to the plywood. Those 1x8 boards won't give a solid foundation and will flex. Over time, that will cause tile to pop loose or crack.

Adam Matan

Guest

Do you need a shower liner on concrete floor?

JRC3 Member. It will need to be lined or it will wick into the slab and studding. The liner also makes the walls around the pan water-tight, that's why the liner normally goes up at least 3" above the pan behind the tile and backer material. Moisture gets behind the wall tile and is eventually caught by the liner.

YPCrumble

Guest

What kind of cement do you use for a shower pan?

Floor Mud QUIKRETEQUIKRETE® Floor Mud (No. 1548-81) is a Portland cement based underlayment mortar designed for leveling travertine, slate and marble floor tile, and for shower pan applications.

Aaronaught

Guest

What kind of concrete do you use for a shower pan?

The best concrete mix for shower pans is made by Quikrete.

They make two products, the first is called Floor Mud, the 2nd is their Sand/Topping mix.

Both work great for building a shower pan..

tokland

Guest

Where do you put cement board in a bathroom?

Cement backer board is mainly used as a sub-surface for tiling. Cement backer board is often used as a tile base on plywood or OSB subfloor. Cement backer board on concrete as a subfloor or underlayment is usually not recommended or needed. In most cases, you can apply tile directly to the concrete.

web-tiki

Guest

Do you have to put cement board under tile?

In short, tile and grout are not inherently waterproof. ... Cement backer board is often used as a tile base on plywood or OSB subfloor. Cement backer board on concrete as a subfloor or underlayment is usually not recommended or needed. In most cases, you can apply tile directly to the concrete.

fedorqui 'SO stop harming'

Guest

Do I need cement board under floor tile?

If you're working over a wood subfloor, cement board is the right choice for your tile base. ... Because plywood expands and contracts beneath the ceramic tile, grout and tile failure (loose tiles and cracked, crumbling grout) is just a matter of time.

wOxxOm

Guest

Can I just screw down cement board?

Put thinset beneath your backerboard. And put your dog out. Once you have the area fully covered with thinset you can lay your backerboards into the bed of thinset and screw it down. DO NOT use drywall screws!

BoarGules

Guest

Do you need to use thinset under cement board?

Not only is thinset a critical component underneath cement board but the other critical component is the fasteners. And you won't have the fasteners if you are trying to install it over concrete.

andilabs

Guest

How do you remove a toilet from a concrete floor?

Use a small hammer and chisel to carefully crack the back of the pan near the joint to the waste pipe. This will separate the pan spigot from the rest of the pan. Then smash the pan away from the pipe with a bigger hammer and clean off any cement on the floor.

Paul Verest

Guest

How high should cement board be in shower?

Start installing your boards a quarter inch above the floor, tub, or shower board and caulk accordingly. 2. Fasten cement board with specified nails or screws, a maximum of 8” on center at all supports.

rap-2-h

Guest

Should I put cement board under tile?

If you want to replace an old, cracked tile floor or other type of flooring with new ceramic tile, it's absolutely imperative that you create a solid setting base for the new tile. If you're working over a wood subfloor, cement board is the right choice for your tile base.

chemamolins

Guest

How many bags of cement do I need for a shower pan?

Building a mud shower is really hard work. This one required 300 lbs (dry) of cement and sand. Another 300 lbs of cement board for the walls. More hundreds of lbs of tile, thinset and grout.