Does cement board go over lip of shower pan? ANSWER. ANSWER - No there should not be a gap between the top of the bathtub flange and the backer board on the wall. The asphalt paper or polyethylene should overlap the tub flange so moisture that collects on the moisture barrier can evacuate into the tub; or more important so it can't get into the wall cavity.
Can you use cement backer board in a shower?
Installing Cement Backerboard for Tile in a Shower. When installed properly they will give you many, many years of durable shower construction. The advantage of cement backerboards is that, while not waterproof, they are dimensionally stable when wet. That just means that when they get wet they do not swell up.
Do you install wallboard before or after shower pan?
Therefore, the pan must be installed first. When installing your shower floor, ensure that it is straight and level as you nail it to the studs or create your mud job. The level lip, flange or ledge that results around the top of the shower pan gives you the ideal starting place for installing the wallboard.
Can water get to the bottom of a cement board floor?
So long as your pan membrane is properly pitched, and you have gravel around the weepholes of the drain, no water will ever get to the bottom of the cement board. Thanks for the replies Terriks and Bill. I'd searched the bathroom forum for help but didn't think to search the flooring forum.
Does drywall go on top or bottom of shower pan?
Some shower pans have them, others don't. On the pans without panels, tile is often installed on the drywall as a waterproof barrier. Whether you choose to install tile or the panel walls, drywall always goes on top of the shower pan, after the pan is set into the floor.
Does cement board go over 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.
How do you install cement board around a shower base?
8:0111:30How to install Cement Board in shower easily - YouTubeYouTubeStart of suggested clipEnd of suggested clipOthers suggest getting it tight to the top of the tub. Up like the higher end of the flange. AndMoreOthers suggest getting it tight to the top of the tub. Up like the higher end of the flange. And then others suggest having like a quarter inch gap between the cement board and the top of the flange.
How do you install cement board around a bathtub lip?
0:3612:58PROBLEM SOLVED for Tub Flange when Installing Cement Board and ...YouTubeStart of suggested clipEnd of suggested clipSo then i just take cement board tape. And i cover. The porcelain part of the tub or fiberglass.MoreSo then i just take cement board tape. And i cover. The porcelain part of the tub or fiberglass. Whatever it is. And press that tape down cement board tape.
How high does the cement board go 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. 3.Jan 31, 2020
Do you need put plastic behind cement board shower?
plastic behind cement board with waterproofing is essentially suspenders when you already have a belt. the waterproofing is also a vapor retarder so if the red guard or kerdi product is continuous, lapping corners and all, the plastic will be unnecessary.Mar 3, 2014
What goes first shower pan or walls?
Whether you choose to install tile or the panel walls, drywall always goes on top of the shower pan, after the pan is set into the floor. Both tile and shower walls perform the same function, they just do so with different types of materials.
How do you waterproof cement board in a shower?
0:2513:06How to Waterproof Cement Board - YouTubeYouTubeStart of suggested clipEnd of suggested clipUse painters tape to protect the tub from the silicon and the waterproofing. Next fill the gapsMoreUse painters tape to protect the tub from the silicon and the waterproofing. Next fill the gaps between the cement board and the tub with silicone. Then allow it to dry before you begin the next.
Does backer board go over shower flange?
The backer board should overlap the tub flange so the tile has a stable backing to attach to. This requires shimming the backer board out from the studs so the wall is plumb. There should be a 1/4" gap between the tub ledge and the backer board.
What do you do with a gap between tub and cement board?
Ideally, you would leave a 1/8 inch gap which would then have the sealant applied to it. Either stopping the cement board above the tub flange or alternately shimming it out and dropping it down near the tub would both be good options.Mar 14, 2017
How thick is backer board shower?
1/2-inch thickAll tile backer boards are made of 100-percent inorganic materials that will not rot, shrink, delaminate, or decompose when exposed to moisture. When selecting a tile backer board, make sure to get a thick-enough size—at least 1/2-inch thick—and always seal the tile backer board with a roll-on waterproofing membrane.Mar 24, 2022
What is the difference between durock and Hardibacker?
Durock is too abrasive and can damage vinyl, porcelain, and enamel. HardieBacker does not contain any course materials, so it is the preferable choice. It has a warranty that extends over the use of vinyl tile applications.Aug 9, 2019
Is Hardibacker good for shower walls?
1/4" hardibacker alone is an unsuitable substrate for shower wall tile. If it were attached to properly waterproofed drywall, plywood, or plaster it would be fine. Think about it, one wayward elbow, knee, or hip bump and you may get flexion which would cause the grout (or tile) to crack.Apr 1, 2019
Cement board placement over tub-lip
So, I am reading conflicting information. I have read that one should put cement board right ontop of the lip, others say no, put it over the lip (so it over-laps a little). And others say, leave a 1/4 or 1/8 gap between the cement board and lip (to allow for expansion).
Comments (12)
The smart approach is past the flange onto tub deck. Conflcting is correct last year i had a client who was very into his Tub MFG installation instructions also being met. The detail drawing for the tub from the MFG had the board sitting on top of the flange. Nonsense.
What is the best substrate for a shower wall?
Installing cement backerboard is one of the more popular choices for a shower wall substrate. Cement backerboards include Hardiebacker, Durock, Fiberboard, wonderboard, and similar products. These materials bridge the gap between expense and effectiveness. When installed properly they will give you many, many years of durable shower construction.
Why do you not want to run the backerboard over the edge of the lip?
You do not want to run the board over the edge of the lip because it will cause the backerboard to bow out and your wall will not be flat. It will also allow the tub or shower base to move a bit – it’s attached to the wooden studs as well. Tubs also move when they are filled with water.
How far above the lip should you stop backerboard?
If you have a tub or shower base you will also want to stop the backerboard about 1/8 inch above the lip.
Is cement backerboard good for tile?
When properly installed cement backerboards will create a rock solid, extremely durable substrate for your tile installation. Taking time and care to solidify what is behind or beneath your tile is the only way to guarantee a lasting installation. Your tile is only as durable as what it is installed upon.
Is cement backerboard waterproof?
The advantage of cement backerboards is that, while not waterproof, they are dimensionally stable when wet. That just means that when they get wet they do not swell up. Any swelling behind tile is a bad thing. It will lead to cracking grout, tile, and all sorts of bad things.
Can you use galvanized nails on backerboard?
To fasten the backerboard to the framing you have a couple of choices. A lot of professionals simply use galvanized roofing nails. While this is perfectly acceptable, I prefer screws over nails when possible. Hardi makes specific screws for their backerboard which can also be used for all backerboards.
Do you need a saw to cut backerboard?
All backerboards are cut by scoring and snapping. You do not need a saw for them. While there are special scoring tools specifically for this you can easily do it with a regular utility knife. While all these backerboards are essentially identical in their effectiveness as a substrate, some are more easily cut.
How many screws do I need to backer a board?
Screw in backer board using roofing nails and approved screws. First every piece should have 6-8 screws. They are a pain to get flush so use roofing nails for the rest (need at least 1 1/4 inch). Put up your alkali resistant mesh tape on all backer to backer seams (gray mesh sold near backer boards at the big box).
Is cement board the same as flange?
You cement board is on the same plane as the flange. It is thicker so it ends up hanging over. Tip - If you are using cement board by itself I would strongly suggest using 1/2 inch. Also I am a strong supporter of hardibacker since it doesn't allow water through or hold water.
How far above the shower pan should wallboard be installed?
This is to allow for movement of the studs. The wallboard must be installed 1/8 inch above the shower pan.
Do you need to waterproof a shower pan?
Waterproofing. Regardless of what type of shower pan you are installing -- acrylic or tile -- the walls of the surround must be waterproofed. If you are installing a tile pan, you must also waterproof the mud job before laying the tile. This is done prior to waterproofing the walls and installing the wallboard because the floor waterproofing ...
Do you need to waterproof a shower floor before installing wallboard?
The waterproofing on the walls may need to extend to just above the shower floor, so the finished height of the floor must be in place before waterproofing can take place.
Is it easier to install a tile or acrylic shower pan?
An acrylic shower pan is an easier installation than a tile pan. It requires no mud job or waterproofing membrane, but it does require direct access to the studs of the shower. The acrylic pan must be screwed directly into the studs of the shower.
backer board above, on or set in shower pan mud
I'm building a custom shower and I'm confused about the best method of backer board installation. I've heard you should install backer board about 1/4 inch above the pan, with backer rod or some type of sealer to prevent wicking up into the board. Also heard set backer board directly on the finished pan, no mention of sealing.
Comments (4)
That's something that's recently been talked about by the rep from Durock, both in the flooring forum, as well as John's Pros forum. I disagree.
Why would water travel up over the lip of a shower pan?
Water would have to travel up over the lip to get to the framing behind the shower pan, in order to do any damage. This reinforces the waterproof nature of the shower.
How do I install a shower pan?
When you install a shower pan on the shower floor, you mount it directly to the wall framing, which is a series of 2-by-4 boards. You'll set and level the shower pan using shims right on the floor, or on a bed of cement mortar. Because the shower pan is screwed to the framing, there is no wall behind or below the base. Therefore, the drywall has to go in after the shower pan.
What goes in first for shower pan?
For tile or shower panels, drywall goes in first. Installing a shower pan includes many steps, such as cementing the floor to create a sturdy base and installing the shower walls.
Why do you need to install drywall last?
Why Install Drywall Last? Installing the drywall last makes the shower more waterproof because it prevents the framing from absorbing water that otherwise would leak through the seam created by the wall and the edge of the shower pan.
What is a shower pan?
The shower pan is actually designed to go under the drywall; it is made with a flange or lip along the top edge. This vertical lip extends up about an inch above the top of the sidewall, so when the drywall installs on top of the shower pan, there is substantial overlap. Water would have to travel up over the lip to get to the framing behind ...
Can you put drywall under a shower pan?
Installing the drywall underneath the shower pan doesn't make much sense, because this allows a small crease between the two structures, and water will always find a way into the tiniest creases and cracks. Since the drywall overlaps the edge of the shower pan, water is less likely to soak through the seam. Advertisement.
Do shower pans have tile?
Some shower pans have them, others don't. On the pans without panels, tile is often installed on the drywall as a waterproof barrier. Whether you choose to install tile or the panel walls, drywall always goes on top of the shower pan, after the pan is set into the floor.
