Tiling a Wall That's Not Square: A Comprehensive Guide
Embarking on a tiling project in a room with walls that aren't square can seem daunting, but with the right approach, it's a task well within your reach. This guide will walk you through the process, from preparation to completion, ensuring your tiling project turns out as stunning as it is functional.
Understanding Your Wall's Dimensions
Before you start, it's crucial to understand the dimensions of your wall. Measure the width and height of the wall at several points to identify any variations. This will help you plan your tiling layout and ensure you have enough tiles to cover the wall.
Gathering Your Tools and Materials
Here's a list of tools and materials you'll need for your tiling project:

- Tiles (ensure you have extra for cuts and mistakes)
- Thinset mortar or other adhesive suitable for your tiles
- Tile cutter or wet saw
- Trowel (notch and straight-edged)
- Level
- Spacers
- Grout
- Grouting float and sponge
- Tape measure
- Pencil
- Bucker saw or nippers for cutting tiles
Preparing the Wall
Before you start tiling, ensure your wall is clean, dry, and free from any loose material. If necessary, apply a primer to improve the adhesion of your thinset mortar. Allow the primer to dry completely before you begin tiling.
Planning Your Tile Layout
Given that your wall isn't square, you'll need to plan your tile layout carefully. Here are some tips:
- Start tiling from the center of the wall and work your way outwards. This will help you avoid having narrow strips of tile at the edges.
- Use a tile cutter or wet saw to cut tiles to fit around obstacles like outlets or light switches.
- Consider using larger tiles in smaller rooms to create the illusion of a larger space.
Applying the Thinset Mortar
Using a notched trowel, apply thinset mortar to the wall in small sections at a time. Hold the trowel at a 45-degree angle to the wall and use the notched edge to create grooves in the mortar. This will provide better adhesion for your tiles.

Laying the Tiles
Starting from the center of the wall, press the first tile firmly into the mortar. Use spacers to ensure even grout lines between tiles. Continue laying tiles, using a level to ensure they're straight and even.
Cutting Tiles to Fit
For tiles that need to be cut to fit around obstacles or at the edges of the wall, use a tile cutter or wet saw. If you're cutting a small amount off the edge of a tile, you can use a bucker saw or nippers.
Letting the Mortar Set
Allow the mortar to set according to the manufacturer's instructions before applying grout. This usually takes 24-48 hours.
Applying Grout
Mix your grout according to the manufacturer's instructions. Using a grouting float, spread the grout over the tiles, working diagonally to force the grout into the joints. Allow the grout to set for about 15 minutes, then use a damp sponge to wipe away excess grout from the tile surface.
Sealing the Grout
Once the grout has fully cured (usually after 72 hours), apply a grout sealer to protect it from stains and moisture. Follow the manufacturer's instructions for application and drying times.
Tiling a wall that's not square requires patience and careful planning, but with these steps, you can achieve a professional-looking result. Happy tiling!
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