If you have a small gap (1/8 inch or less), a caulk can usually handle it. For gaps larger than that, you’ll need a good sealant. Apply sealant to both sides of your tub-cement board joint, then smooth it out with a putty knife. If a space is smaller than 1/4 inch, apply a single bead of caulk to the edge.
How to seal cement board around a bathtub?
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. Shimming it out is probably only feasible if the tub has a really skinny flange like a lot of the steel tubs do.
How much gap do you leave between cement board and tub?
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.
How to seal the backer board at the tub flange?
Well, I’m going to give you three different ways to seal the backer board at the tub flange. 1. Caulk the gap Probably the simplest way is to caulk the gap with 100% silicone or a urethane sealant. First, you would waterproof with your favorite liquid waterproofing membrane of choice.
How to fix a leaky tub flange?
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. Shimming it out is probably only feasible if the tub has a really skinny flange like a lot of the steel tubs do. 2. Band the flange
How do you fill gap between tub and surround?
0:432:18How to Caulk Large Gaps in Bathtubs : Caulking Tips - YouTubeYouTubeStart of suggested clipEnd of suggested clipAnd cut a very small angle about an eighth of an inch off the top. You're going to cut it at about aMoreAnd cut a very small angle about an eighth of an inch off the top. You're going to cut it at about a 45 degree angle. Now taking your caulking gun go ahead and load up your caulk.
Does cement board go over flange on bathtub?
0:4212:58PROBLEM SOLVED for Tub Flange when Installing Cement Board and ...YouTubeStart of suggested clipEnd of suggested clipOkay so i get asked a lot how do i m cement board to a tub flange. And i'll show you right here so iMoreOkay so i get asked a lot how do i m cement board to a tub flange. And i'll show you right here so i went on. Top. Of the tub. Flange. That sticks out from the wall. Here. So i have a little gap there
Should you caulk between tub and surround?
As with any other gap near your bathtub, you'll want to close the opening to prevent any possible water damage or the onset of mold and mildew. Since you are joining two different materials together, you should use caulk in the space where the floor tile and tub meet.
What do you put between tub and tile?
Caulk provides a waterproof seal where tile abuts other materials, such as bathtubs, sinks, or walls. A carefully run line of caulk (known as a bead) in these areas adds a finished touch.
Should cement board go over bathtub lip?
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. Then apply a generous amount of thin-set to the bottom bathtub tile and position it 1/8 in.
Should backer board go over tub lip?
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.
How do you fill a large gap between tile and tub?
If you have tile on the wall adjoining the tub, select a caulk that matches the color of the grout. If your gap is smaller than 1/8 inch in width, use regular caulk; fill gaps larger than 1/8 inch with a sanded caulk. Make sure the gap is clean and dry, then squeeze a thin, even bead of caulk into the space.
What can I use to seal around my bathtub?
For caulking around a bathtub, Tom recommends using anything that is 100% silicone. In the segment, he used 100% Silicone Sealant in White, which is manufactured by Gorilla Glue.
Where do you caulk a tub surround?
0:062:15How to Caulk a Tub - Ace Hardware - YouTubeYouTubeStart of suggested clipEnd of suggested clipWhere the tub meets the shower walls.MoreWhere the tub meets the shower walls.
What do you do with the gap at the end of the bath?
Things you could do to help: Make sure it's watertight. Tank it, or better use a waterproof board, plenty of sealant between board and bath edges and joints to wall (butyl tape also good). Tiles on top - instead of grout, use colour match silicone (you should use at wall joints anyway, but use everywhere).
How do you caulk a 1/2 inch gap?
0:0510:49How to Caulk BIG GAPS!!!! - YouTubeYouTubeStart of suggested clipEnd of suggested clipOkay so the things you're gonna need is some backer rod a putty knife a caulking gun and preferablyMoreOkay so the things you're gonna need is some backer rod a putty knife a caulking gun and preferably some latex caulking. But this can be applied to actually filling any large gaps with caulking.
How do you caulk between floor and tub?
4:147:26How To Caulk Your Bathroom Flooring | CBH Homes - YouTubeYouTubeStart of suggested clipEnd of suggested clipTherefore open up the caulking gun drop my particular tube in there push it in retract thisMoreTherefore open up the caulking gun drop my particular tube in there push it in retract this particular item obviously for puncturing the tube. And i can start applying the caulk or the silicone.
space between cement board and tub
For my bath surround/shower, my GC put up cement board without the 6mm poly. I need some sort of waterproofing and was thinking about using HydroBan. However, there is a 1/2 inch gap between the bottom of the cement board and the top of the bathtub flange.
Comments (9)
DH says the cement board should come over the flange, without touching the tub rim/ledge itself (maybe 1/4" space).
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.
Is plastic tub surround better than ceramic?
Lots people just glue tub surround panels to bare drywall and those installations last a long time. A plastic tub surround is more reliable than ceramic tiling. Several of the replies mentioned tile and it sounds like I should forget about gypsum, including green board, altogether and use one of the cement board types.
Can you use drywall as a tile backer?
You definitely don't want to go with drywall or greenboard, but there is a gypsum based tile backer board made by the Georgia Pacific company called Dens-Shield that's gypsum based, and as easy to cut and install as drywall, but is very water resistant and suitable for use as a tile backer.
Can you cantelever tile?
If tiling, it depends...you can't cantelever the tile too far...as long as more than half of it is supported on the wall surface, it can be okay to leave it short. You dont' walk on the wall, and it's unlikely that you'd be applying pressure right above the tub edge, so a little cantelever is okay.
