How to Patch a Tiled Wall: A Step-by-Step Guide

Patching a tiled wall can be a daunting task, but with the right techniques, it can be done effectively and efficiently. Whether you have a cracked tile or need to replace a section of your tiled wall, this step-by-step guide will walk you through the process.

Preparing the Wall

Begin by protecting the surrounding area with drop sheets. Remove any tapware and cover the tap spindles with tape. Using a hammer and cold chisel, carefully knock out the broken tiles, being cautious not to damage the surrounding tiles. Clean off any remaining tile glue to ensure a smooth surface.

Applying Bonding Agent

Mix a solution of 4 parts water to 1 part BondCrete and paint it onto the bare wall. Allow it to dry, then mix another solution of 1 part water to 4 parts BondCrete and apply a layer to the same area.

Rendering the Wall

Mix a Sand & Cement mix with water to create a cement render. Apply the moist (but not runny) render to the wall using a scraper, ensuring it sits out from the wall surface. After 30 minutes or so, use a large, broad knife to scrape off the excess, leaving the render flush with the wall. Allow it to dry for 24 hours.

Waterproofing the Surface

Apply a waterproofing membrane to the new render, following the manufacturer’s instructions.

Cutting and Laying the Tiles

Use a tile cutter to cut tiles to fit the patched area, marking the locations for any tapware. Drill holes using a diamond-tipped hole saw. Mix the tile adhesive, ensuring it is compatible with the waterproof membrane, and apply it to the back of the tiles using a notched adhesive spreader. Press the tiles into position, using tile wedges to hold them in place.

Grouting and Sealing

Grout the joints between the tiles, being careful not to grout the corners or the junction between the tiles and the bath. Wipe off any excess grout using a clean, damp sponge and let it dry. Polish the tiles with a dry cloth.

Applying Silicone Sealant

Apply tape along both edges of the wall corner and at the junction of the tiles and the bath. Cut the nozzle of the silicone sealant at a 45-degree angle, slightly wider than the joint to be filled. Slowly run the silicone down the joint, making sure it is completely filled. Using a finger dipped in soapy water, smooth the surface of the silicone to the edges of the tape. Carefully remove the tape and leave the silicone to cure. Finally, replace any tapware.