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Waterproof Curbless Basement Shower Systems

Waterproof Pan, Walls, and Bathroom Floor

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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 want your bathroom remodel to be easier our course over on Bathroom Repair Tutor is great.

Grab our free guide if you’re doing a DIY bathroom renovation – it shares how to remodel a bathroom in 10 days or less

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Thanks as always for reading, watching, and being part of our awesome community.

Ask your questions below and we’d be happy to help.


Jeff Patterson





P.S. Our online store has great supplies for homeowners doing a bathroom remodel. You’ll find shower systems, tiling tools, and more.

  1. Patricia Pinckard says:

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

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