How can I fill the 34 gap between the studs and tub when installing Kerdi boards around my bathtub?
Asked by Yara Holen 
3 months ago
Last Updated: September 2, 2024
I was planning on putting up Kerdi boards around my tub, but I hit a little snag. One of the walls has a 3/4” gap between the studs and the tub. Any ideas on how to fill it in?
Oh, and just so you know, the other walls are gap-free.
Thanks for your help, everyone!
You could either extend the fur out on that wall or shift the tub closer to it to balance the gap on both sides.
Use water-resistant plywood for added protection.
Frame it out with fir.
Start by laying down a sheet of plywood and then fasten the board or furring strips on top.
When setting up drywall and kerdi, start by ripping plywood nails to the studs.
Double the amount. Create strips for the framework.
‘t bother filling it if the tub is properly secured
How do you plan on tiling the wall properly? The kerdi should be flush with the tub’s lip at the very least.
Recommended using 3/4” kerdi board
Suggested that as a possible solution, but keep in mind that it may not be accessible in every location, unless you opt for Amazon perhaps.
Use shims and screws. Also, add a bit extra thinset.
Assuming the plumbing is completed, you won’t be able to make any adjustments. The Kerdi board is 1/2 inch, so typically you would have to include 1/4 inch plywood strips. However, since the tub fits snugly on the other sides, to maintain symmetry in the walls, add 3/4 inch plywood.
So, are you planning to tile or create a tub surround?
Mentioned that he’s considering using Kerdi, but I’m not sure if he will actually choose that option for the surround.
Trim 3/4 inch strips and use them as shims
You might want to grab a level. It might be a good idea to trim either 1/2 – 3/4 or 3/4 – 1″
Hey everyone, I appreciate your help! I’m confident I can figure it out on my own. By the way, this is the first time I’ve encountered that term. I’m learning a lot here.
Why not just go ahead and install the 3/4” kerdi board? 😉
Me too, !
Hey there!
If you have a 3/4” gap between the studs and the tub, an easy solution is to use strapping or a furring strip to bridge the gap. This will provide a flat surface for attaching Kerdi boards. Just ensure the strapping is firmly secured to the studs and is level with the wall. After that, you can proceed with installing the Kerdi boards normally.
I hope this suggestion helps, and best of luck with your project!
Robert
Start by adding a layer of 1/2” green board or purple board. Make sure the Kurdi board has a solid substrate underneath. Apply Red Guard to the bottom 12” of the drywall extending over the tub flange. Protect your tub by masking and covering it with ram board or cardboard while you work to prevent scratches. Is your tub supported by a continuous ledger board around its perimeter? If not, it should be. Remember to install wood framing backing for any fixtures you plan to attach to the wall, like grab bars, towel bars, shelves, or soap holders. It’s a good idea to plan their positions in advance and keep a record for future use.
With all the superior products available nowadays, why would anyone still use drywall in a shower?
In my experience, Kerdi board is best installed on a solid continuous backing substrate like moisture-resistant gypsum board, green board, purple board, fibreglass faced board, or 1/2″ Portland cement board. The Kerdi board instructions are readily available. I highly recommend it.
I have experience using these products professionally and I have to disagree. I personally prefer Wedi and find it to be excellent when installed on studs.
Firring strips are typically necessary for tubs and showers.
Has the entire wall been removed? If so, fur out the entire side of the room
Build a wall using m
Install the studs snugly
To fill the gaps, use 1×2 pieces between the studs
Constructed using foam
Adjust the studs
I noticed that the Kerdi product is available in various thickness options.
For the drywall, you’ll need two layers – one at 1/2 inch and the other at 1/4 inch.