Poor waterproofing is often to blame for tiling failures, leaks and costly repairs. Tiling is not inherently waterproof, and therefore it is essential to have properly detailed and installed waterproofing behind tiled surfaces, along with cement-based grouting.
Begin by priming the surface and ensure it is in good condition, is clean and dry, and has a moisture content of less than 5%. The shower surface can be shot-blasted to give the tile adhesive extra grip, before being sealed with a layer of TAL Floor Primer. “If the surface is dense and smooth, apply a slurry comprising TAL Floorkey and TAL Rapidfix,” says Margon.
To allow for movement, apply a 10 mm silicone bead in all internal corners and joints around the floor waste, taps and rose plumbing. The two ingredients of TAL Sureproof must be mixed together mechanically. “Add the powder to the liquid and mix until a creamy, lump-free consistency is obtained. Let the mix stand for three minutes and stir again,” Margon instructs.
Next, apply the first coat of TAL Sureproof to the wall and floor corners. Immediately bed the TAL Sureproof Membrane (200-mm-wide) into the wet Sureproof, ensuring there are no wrinkles or air bubbles trapped beneath the membrane.
“The Sureproof Membrane must be pushed into the corners, ensuring the entire interface is covered with the membrane.
Apply a second coat of TAL Sureproof to saturate the membrane completely before the first coat dries,” Margon continues.
For wastes that are flush with the floor, take the application down into, and around, the waste. For the main shower wall and floor surfaces, apply the first coat of TAL Sureproof to the dry, primed surface with a short hair enamel paint roller or brush, and allow one to two hours to dry. Apply the second coat in a different direction to ensure complete coverage, avoiding air entrapment or pinholes. Allow the TAL Sureproof system to dry for 24 to 36 hours before fixing the tiles.
When tiling, modify the tile adhesive and grout with TAL Bond Powder or Bond Liquid to add flexibility and water resistance to the tiling installation and apply a silicone sealer to all the perimeter joints. “As a final touch, seal the grout joints with TAL Grout Sealer. This will ensure your newly-installed shower not only looks good but is also easy to clean,” Margon concludes.
Use of the shower is not recommended for 72 hours after completion of the tiling to ensure that the installation has cured fully. If you are in any doubt, contact the TAL Technical Advisory Service on 0860 000 TAL (825) or email [email protected]
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