Make Bathroom Renovations EasierLearn More
Make Bathroom Renovations Easier


Waterproof Curbless Basement Shower Systems

Waterproof Pan, Walls, and Bathroom Floor

As Seen On
Waterproof Basement Curbless Shower

What’s the best way to waterproof basement curbless shower systems?

Today’s tutorial has all the juicy details, we’ll show exactly what to do and what materials to use.

Building curbless basement walk-in showers is definitely a one step at a time project. And waterproofing is perhaps the most important step of them all.

Let’s dive in!

Waterproof Basement Curbless Shower Systems with ShowerSeal

Have you painted a bedroom?

If so, then using KBRS ShowerSeal is very similar. It’s a liquid waterproofing membrane used to seal walls and floors. Plus, ShowerSeal acts as an isolation membrane for floors, meaning it helps prevents tile from cracking.

We used ShowerSeal to waterproof the shower pan and walls and bathroom floor.

The first step is to cut ShowerSeal fabric for the corners and seams. Also, before I forget, this curbless walk in shower got two coats of the KBRS ShowerSeal, which we highly recommend.

Remove any paper or stickers on the cement board. Then wipe down the mud pan, which we build in a prior tutorial, with a damp sponge. Stir the KBRS ShowerSeal for at least 30 seconds and apply it in the corners of the shower pan.

Apply the ShowerSeal Fabric to the inside and outside corners, and apply more ShowerSeal to make the corner as flat as possible. Use the fabric to then waterproof around the linear drain flange and transitions between the cement board and shower pan.

ShowerSeal fabric should be evenly spaced and have a 2″ overlap on either side of the cement board or seams being covered.

Waterproof the cement board walls using fabric over the seams/corners and applying liquid ShowerSeal with a 3/8″ nap roller.

Curbless showers should also have the bathroom floor waterproofed, and that’s why we used liquid ShowerSeal on the floor as well.

Watch this great video for all the details


What’s Next

The next step is to tile the shower pan, we like doing that first then tiling the shower walls.

If you’re doing a bathroom remodel and want to simplify the process enroll into Bathroom Repair Tutor’s 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. Patricia Pinckard says:

    We are converting an upstairs tub to a shower and my husband is paranoid about leaks. What do you recommend?

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Translate ยป