Best answer
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.
Do I need a vapor barrier behind cement board in shower?
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.
Do you have to waterproof cement board?
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.
Can you paint cement board in shower?
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.
Can cement tiles be used in a shower?
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.
Do you need to waterproof cement board in a shower?
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.
Do I need to waterproof cement board in shower?
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.
Can you use cement tiles in a shower?
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..
Do you need to seal a concrete floor before laying laminate?
You don't need to seal a concrete floor before installing laminate; however, to prevent moisture from the concrete floor from affecting your laminate, install a vapor barrier of polyethylene film. Install this barrier even if the concrete subfloor is covered by vinyl, linoleum, terrazzo or ceramic tile.
Do you need plastic behind cement board?
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).
Do you put cement board under a shower pan?
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.
Related Question Answers

Chandu
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Jeff Scott Brown
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madlep
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Marcus Müller
ProfessionalDo 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..

Marcin Zablocki
UserDo 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.

Eric
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Rocket Hazmat
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Nguyen Minh Binh
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Bruno Lowagie
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Cameron
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Daniel Ruoso
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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..

psihodelia
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Mikhail_Sam
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rouble
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i_am_jorf
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roli roli
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Chubsdad
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MrYoshiji
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...
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Nicolai Parlog
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aefxx
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chrisg
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Your shower will leak and you will be tearing it out within a year..

Quanayahton
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Kevin Coppock
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Justin
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prasad_
GuestWhat kind of cement do you use for a shower pan?
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Ken Benoit
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Yi Zeng
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scaisEdge
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Mikko Ohtamaa
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BOZ
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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.

pault
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duffymo
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If you want a concrete project to maintain its strength and fresh appearance, you need to waterproof it..

Ran Turner
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DNS
GuestHow much does a concrete shower cost?
Custom pans, which are built on-site by your plumber and may be made of metal sheeting, concrete, or waterproofing materials $45 - $65 an hour, plus materials ($50+). Expect a 36x36 inch shower pan 3 to cost at least $650, up to as high as $1,500 if replacing an existing pan or using luxury materials.