Fixing Porcelain Tiles to a Slab

Follow this advice for laying 10mm or 20mm external tiles to existing slabs.

Fixing Porcelain Tiles to a Slab

External Leveller - Preparation - Concrete

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Concrete: New concrete must be allowed a minimum of 6 weeks drying time. As an approximate guide for drying times, allow 1 day per mm up to an overall depth of 40mm and 2 days per mm for anything above 40mm. Ensure new concrete is confirmed dry via consistent moisture readings across the whole surface. Concrete screeds must have a reading of less than 75% relative humidity (RH) before work can commence. Remove any laitance from the surface mechanically and ensure that mould oil, curing agents and any other contaminants are removed. Remove all dust and dirt ideally by vacuum. Prime surface with Tilemaster Primeplus diluted at a 3:1 ratio (3 parts water to 1 part Tilemaster Primeplus) and allow to dry.

PREPARATION:

Before starting, all substrates must be clean, dry and strong enough to support the weight of the leveller and the final floor covering being applied. Remove all dust, dirt, oil, grease and other contaminants that may affect adhesion. Remove any loose or flaking layers, laitance should be removed from concrete surfaces. Where traces of tile adhesive residue remain, these must be checked to ensure that they are strong, sound and well adhered to the substrate in order to receive a levelling compound.

If External Leveller is used in an installation that will be submerged, such as swimming pools, the product must be allowed to cure for 28 days before being submerged in water to allow for full curing times.

All substrates require priming prior to the application of Tilemaster External Leveller. Priming the substrate will minimize the risk of pinholes forming, allow for the best flow properties and also prolong the working time of the product whilst maintaining a ‘wet edge’ for a longer period. For recommended priming dilution rates please refer to Page 3 of this data sheet.

MIXING AND APPLICATION:

Always mix by adding powder to water. Tilemaster External Leveller is mixed with a water content of 4.8 – 5.0 litres of water per 25kg of Tilemaster External Leveller. Pour the pre-measured clean water into a suitable clean mixing vessel. Add the powder component slowly whilst mixing with an electric paddle and continue to mix for a further 2 minutes until a smooth and lump free consistency is obtained. Once mixed do not add additional water. Exceeding 5.0 litres of water per 25kg will result in water bleed and therefore extended drying times and a weakened mix.

N.B. Once mixed, Tilemaster External Leveller will remain workable in the bucket for 20 - 30 minutes at 20°C.

Pour a small quantity onto the prepared surface and trowel down lightly to a depth between 2mm and 50mm. The use of a spiked roller is recommended immediately in thin applications in order to remove entrapped air and smooth out flow lines. Setting times will depend on atmospheric conditions/temperatures, it will be slowed by lower temperatures and accelerated by higher temperatures.

If a depth greater than 50mm is required, allow the first application to dry and prime the surface with Tilemaster Primeplus at a 3:1 ratio before applying a subsequent coat.

Full Datasheet for Tilemaster External Leveller

Full Datasheet for Tilemaster Fast One Coat DPM

Setaflex Semi Rapid

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PREPARATION:

Before starting, all substrates must be clean, dry and strong enough to support the weight of the tiles, tile adhesive and grout. Remove all dust, dirt, oil, grease and other contaminants that may affect adhesion.

MIXING & APPLICATION:

Only mix small quantities at a time until you have become accustomed to the nature of the product. Always mix powder to water and mix to a smooth and lump free consistency. As a guide for powder to water ratio, 20kg of powder requires approximately 4.4 - 4.6 litres of water. Never add water after initial mixing, as this will impair the strength of the adhesive. Product that has started to set must be discarded.

NB. When fixing large format tiles, natural stone tiles and tiles that have deep studs on the back, you must skim the back of the tile with a thin 1 – 2mm layer of adhesive, this is referred to as back buttering. This will significantly improve the bond strength.

On a flat, even substrate where dry conditions exist, apply adhesive to the substrate as a thin floated coat at a uniform thickness of 3mm – 6mm and then rib / comb out using a suitable notched trowel. Where substrate conditions do not allow thin bed fixing, Tilemaster Setaflex Semi-Rapid can be applied to a maximum bed thickness of 12mm. Ensuring the adhesive is still moist, bed tiles into adhesive using a twisting action ensuring full coverage of adhesive between tile and substrate. Regular checks should be made to make sure that there are no voids in the adhesive bed.

NB. When fixing tiles externally or in areas subject to prolonged or permanent wet conditions, you must ensure that you achieve 100% adhesive coverage between tile and substrate.

Full Datasheet for Tilemaster Setaflex Semi Rapid

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