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Wedi Board Installation for Curbed Showers!

Completing the Wedi Fundo Primo Shower Kit

As Seen On
Wedi Board

Our prior tutorials shared how to waterproof a shower bench with Wedi and add the Fundo Primo shower pan.

Today, we complete our shower waterproofing with the Wedi board installation and also add a custom shower niche.

This is perfect for anyone doing a master bathroom remodel over the weekend or in the evening.

You’ll see how simple it is to install Wedi board.

Let’s dive in.

How to Start Wedi Board Installation

The Wedi board in today’s tutorial came with the Wedi Fundo Primo shower kit we purchased.

In fact, all the materials we used were in that kit – which is very convenient.

Start with the main wall and cut a notch in the first Wedi board for the shower bench.

Notching Wedi Board for Bench

Clean the rabbet cut in the Wedi Fundo Primo shower pan. Then fill it with a generous bead of Wedi joint sealant.

Fill Rabbet with Wedi Joint Sealant

Also apply joint sealant along the perimeter of the shower bench that’s up against the main wall.

Embed the first Wedi board in the joint sealant and start the first set of screws/washers 4 inches above the shower pan.

Add Wedi Screws and Washers

Add successive screws and washers every 12 inches.

This shower has a custom 16″ shower niche using Wedi board.

But the existing 2×4 framing had to be cut from the niche to make this accommodation.

We used a Fein oscillating tool to delicately cut the 2×4 without ruining the drywall in the adjacent closet.

Then framed the niche with 2×4 wood blocking.  The bottom 2×4 was slightly sloped downward.  And both blocks were secured to the studs with 3″ decking screws.

Shower Niche

We added 2×4 wood blocking in the main wall for grab bars.

Wood Blocking

Then applied joint sealant to the top of the first Wedi board and installed the second board on top of it.

Joint Sealant on Top of Board

Again add screws and washers every 12 inches along the stud. Screws/washers can also be pinched at the seam between two Wedi boards.

Pinch Screw and Washer


Wedi Board on the Plumbing Wall

Wedi boards are great for plumbing walls. Most of the cutting can be done with a utility knife.

Cut a notch in the bottom Wedi board for the curb.

Notch Plumbing Wall Board for Curb

Then puncture the back of the board to indicate the mixing valve location. Cut holes for the mixing valve and plumbing ports with a utility knife, oscillating tool or hole saw.

Wedi Plumbing Ports

Add Wedi boards to the plumbing wall using the same protocol as the main wall, i.e. joint sealant in the shower pan rabbet, sealant on the top edge of successive boards and screws/washers every 12 inches.

Plumbing Wall


Custom Shower Niches with Wedi Board

The plumbing wall in this shower had a custom shower niche.

Instead of buying a prefab niche we built a custom version from extra Wedi board.

What’s the order of operation for building a custom Wedi niche?

It’s simple,

Back butter the back of the Wedi board and apply joint sealant to the niche perimeter.

Add this Wedi piece to the bottom of the niche (check that it’s sloped downward).

Wedi on Bottom of Niche

Then apply thin-set mortar or joint sealant to the back wall.

Back butter the Wedi board with thin-set. Add a bead of joint sealant to the back of the bottom Wedi board.

And embed the board to the back wall.

Wedi Board on Back Wall

Add Wedi to the sides and top of the niche using the same technique. For those sections we used screws and washers.

Wedi Niche

Our video shows step by step how we did this.

There are some very important tips with the niche that are hard to explain in writing.

So watch our video for all the details.


Wedi Board on the Shower Bench Wall

Start the shower bench wall by adding a thick bead of joint sealant to the top of the bench.Wedi Shower Bench Wall
And joint sealant to the perimeter of the main wall.

Wedi joint sealant to perimeter

Then embed the Wedi board in that joint sealant and attach it to the studs.

Wedi Shower Bench Wall

Complete the shower bench wall like the main wall by adding screws and washers.

Our tutorial on how to waterproof a shower bench shows how we used Wedi board for that section of the shower.


Waterproofing Wedi Seams and Screws

Apply joint sealant to all the vertical and horizontal seams as well as screws/washers. Smooth the joint sealant with a Wedi corner putty knife or 3″ putty knife.

There should be a 3/4″ to 1″ bead of joint sealant on either side of seams.

The last step is to add a mixing valve and pipe seal.

Our video shows the details on how to do this and the complete Wedi board installation

What’s Next

Wedi board installation is very easy. And if you have to replace a broken tile it’s nice to know the blue foam is waterproof!

And the joint sealant cures in a few hours. Which means boards can be tiled the same day they’re installed.

If you’re installing a curbed shower, our first tutorial in this series might be invaluable. We share how to prep for the curb and pan.

If you’re doing a bathroom remodel and want to simplify the process enroll into the Bathroom Repair Tutor Video Library

We show how to build showers (Schluter, Wedi, Curbless, etc.), install tile, upgrade basement bathrooms, and more.

The extra guidance is invaluable

Enroll Today



Jeff Patterson





  1. mickey gaw says:

    How do you install a flex collar for the mixing valve?

    1. Jeff Patterson says:

      Thanks Mickey for asking. The that can be installed using thin-set mortar. We have a tip on how to do that at the end of the video in this tutorial. Start watching the video at the 15:00 minute mark.

  2. Justin says:

    I will have more questions, but a couple I have now are these:

    I am planning to use wedi for the walls going down to the tub. Do I put the wedi over the lip of the tub that is attached to the studs or just to the top of it?

    Also when I end the wedi to join with the drywall, should I put a metal strip that would make a nicer transition to the drywall?

    Also, when I installed the new tub is doesn’t hit the back of the studs. They had double drywall installed behind the back wall of the tub for some reason. I was just going to attach cross wise 3×1 strips to bring it out and then attach the tub and then put the wedi board on that, is that sound good?

    I am practicing using the wedi on the spare bathroom before I go all out on our master bath to make sure I am good at doing this.

  3. Kem says:

    How do I waterproof a window in my shower with Wedi system? I can’t find anything on that.

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