Guides
Tile Adhesive: A Guide
Tile adhesive does more than stick tiles to a wall. The right adhesive copes with the tile, the surface behind it and the conditions in the room; the wrong one is a common reason tiles crack or come loose.
Ready-mixed and powdered adhesives
Ready-mixed paste adhesives are convenient for small ceramic wall tiles in dry areas. Powdered cement-based adhesives, mixed with water on site, are stronger and are used for floors, porcelain, larger tiles and wet areas. Always check what an adhesive is rated for on the bag or tub.
Standard and flexible
Standard adhesives suit stable surfaces such as solid walls with light ceramic tiles. Flexible adhesives cope with slight movement, which makes them the usual choice for floors, timber subfloors, plasterboard and backer board, porcelain, larger tiles and heated floors. If you're unsure, a flexible adhesive suitable for the tile and the surface is the safer choice.
Rapid set
Rapid-setting adhesives cure much faster than standard ones, so grouting can start sooner and floors can be walked on earlier. They give less working time, so they're mixed in smaller amounts. Follow the manufacturer's instructions for working and curing times.
Wall and floor
Wall adhesives are designed to hold tiles without them slipping down the wall. Floor adhesives are designed to bed tiles fully under foot traffic and the weight of furniture and appliances. Many cement-based adhesives are rated for both, but check the product is rated for where it's going.
Large, heavy tiles and natural stone
Large-format porcelain needs an adhesive rated for large tiles, often a flexible or high-performance one, with full coverage on the back of every tile. Natural stone needs an adhesive suitable for natural stone, and light or translucent stones such as marble are usually fixed with a white adhesive so it doesn't show through or stain.
Underfloor heating and outdoors
Over underfloor heating, use a flexible adhesive suitable for heated floors, and leave it to cure fully before the heating is switched on. Outside, use an adhesive suitable for external use and frost: many indoor adhesives aren't.
Why coverage and a flat surface matter
Adhesive only works where it touches both the tile and the surface. Hollow spots under tiles crack under load and let water sit behind them. Adhesive is spread with a notched trowel suited to the tile size and each tile bedded firmly, sometimes with adhesive on the back of the tile too. Adhesive isn't a filler for a bowed wall or an uneven floor, so surfaces are made flat first.
Robert Rajz is an NVQ Level 3 tiler with 18 years' experience, based in West Ealing, W13. He holds a Gold CSCS card, is DBS checked and fully insured, and is rated 5/5 on MyBuilder and 10/10 on Checkatrade.
FAQ
Common questions
What adhesive for porcelain? +
Porcelain absorbs very little water, so it needs a cement-based adhesive rated for porcelain, usually a flexible one, especially on floors and for larger tiles.
Do I need flexible adhesive? +
On floors, timber, plasterboard, backer board and heated floors, and with porcelain or larger tiles, usually yes. Check the tile and adhesive manufacturers' guidance.
Can I use the same adhesive outside? +
Only if it's rated for external use and frost. Many indoor adhesives aren't, so check the product before using it outside.
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Call Robert on 07427 725086 or request a free quote.
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