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How to Tile a Shower Wall (Knee Wall Quick Tips)

Knee walls are a great way to open up a bathroom and make it look bigger.

Small bathrooms in particular can benefit from this type of project.

Today you’ll learn how to tile a shower wall, specifically the knee wall, and in the end be way more confident to tackle this project yourself.


Tip 1: Set Tile on Plastic Spacers

Rubber spacers are sold in most home stores. Stay away from these like their the plague. Rubber tends to flex and plastic doesn’t.

This general rule of thumb is important when setting tile because rubber spacers will lead to uneven grout joints.

Place 1/16 or 1/8 inch plastic spacers on the tub and position your tile on top of them.

How to Tile a Knee Wall - Set Tile on Spacers

A small gap will exist between the tile and the tub. It’s an expansion and contraction gap which prevents tiles from cracking.

How to Tile a Knee Wall - Gap

Tip 2: Laser Level the Tile

Unfortunately I didn’t mention these next tips in my video.

Laser levels can be used to level tiles as they’re set on the wall. It’s a bit subtle in the picture below but there’s a red line on the top of the tile – that’s the laser.

How to Tile a Knee Wall - Laser Level

Laser levels are better than ledger boards, which compromise the waterproofing, or pencil marks that get smeared by thin-set.

Directional troweling is an absolute MUST for both the wall and the tile.

How to Tile a Knee Wall - Directional Troweling

All the trowel ridges face the same direction on the knee wall – this is called directional troweling. Back buttering the tile will improve its bond to the wall. The 12×24 inch tiles we used were heavy and I decided to back butter them.

Sorry that I forgot to mention these tips in the video, but better late than never.

Furthermore, apply adequate pressure and a slight up and down movement to the tile in order to collapse the trowel ridges.

How to Tile a Knee Wall - Apply Pressure

Collapsing the trowel ridges helps provide 100% thin-set coverage to the tile and improve the bonding between it and the waterproofing.

Tip 3: Employ a Tile Leveling System

Do you see the red things between the tile?

How to Tile a Knee Wall - Tuscan SeamClips

Those are the Tuscan SeamClips, a tile leveling system that prevents tile lippage. Some folks don’t believe in tile leveling systems.

That’s fine.

Other tile setters use them religiously.

Tile isn’t straight or even on all the edges. This is especially the case for large format tiles like the ones you see in today’s video.

In addition, some tiles have a slight bow in the center which makes it difficult to align the edges of adjacent tiles.

Tuscan SeamClips are placed two inches from the edge of tile and snapped into place.

How to Tile a Knee Wall - Tuscan SeamClips from Edge

SeamClips are a tool, just like a trowel or tile cutter. They’re meant to tune the tiles and help the tile setter achieve flat edge transitions.

Plastic horseshoe shims, e.g. 1/16 inch shims, can be placed between tiles to achieve a 1/16 inch grout joint.

We’ve also been testing the T-Lock system by Perfect Level Master.

How to Tile a Knee Wall - T Lock System

Our buddy Sal DiBlasi recommended T-Lock and frankly Sal is a tiling God. When he recommends something it’s best to take notes.

Tile leveling systems are a small investment but well worth it. Tiles will be flat and even grout joints will be achieved.

How to Tile a Knee Wall - Flat Tile

Tip #4: Cap with Marble

Marble is a great material for capping the knee wall.

How to Tile a Knee Wall - Marble

Again, I forgot to mention this in the video but slope the marble by 1/4 inch per foot so that water will drain from it.

Furthermore, the marble should overhang the edges of the knee wall evenly on all sides.

How to Tile a Knee Wall - Overhang Marble

Most wet tile saws can cut marble. I used the DeWALT D24000 wet tile saw for this project.

How to Tile a Knee Wall - Cut Marble

Four foot slabs of marble like the one in this bathroom cost about $100. Be careful when cutting the marble because mistakes can be costly.

Tip #5: Save Money Using Schluter Metal Profiles

Bull nose tile is expensive and that’s one reason we like Schluter’s metal profiles.

RONDEC is about $20 for 8 linear feet and comes in a variety or colors/styles.

How to Tile a Knee Wall - Schluter RONDEC

We used a chrome piece of RONDEC because all the fixtures are chrome, but it comes in a variety of finishes. It’s common practice to set the RONDEC in thin-set then tile over it.

How to Tile a Shower Wall - Set RONDEC

We’ve also set the tile, packed the edge with thin-set, and slid the RONDEC behind the tile.

It’s not a bad idea to have the RONDEC a little proud of the knee wall, i.e. stick out a bit more than the depth of the tile.

That way, the tile can be back buttered to make it flush with the RONDEC.

How to Tile a Shower Wall - Set Tile

Watch our video for a few more tips – and to see what this shower looks like.

What’s Next

If you’re doing a bathroom remodel and need help, join one of our online courses – they’ll make your bathroom renovation much easier!

Let me know if you have any questions and I’ll do my best to help.



Knee Wall Tiling Tips