Preparation

As with most jobs, proper preparation is the key to success and is essential if you want to avoid even the possibility of having to do all or part of it again! So, do your homework, prepare thoroughly and don't rush into anything until you're sure you know exactly what your plan of action is and how you're going to carry it out. This applies just as much, and possibly even more so, to tiling because the result will reflect the quality and thoroughness of its preparation.

Here are some of the main things you need to consider before tackling that tiling job you've been putting off!

Probably the most important thing is that the surfaces you're going to tile should be as flat and even as possible; It doesn't matter if they're not smooth. Check with a straight-edge or plumb-bob. If your walls are too uneven, then they will need to be skimmed or even re-plastered if the undulations or unevenness in the wall are greater than the thickness of your tiles. Bonding or renovating plaster should be used. The British Standard for flatness is BS5850 and says that the maximum deviation should not exceed 3mm in 2 meters, although this can be quite difficult to achieve.
Never correct excessive unevenness or undulations with tile adhesive and always follow the adhesive manufacturer's instructions because a maximum depth of adhesive will often be stated.
TILING OVER TILES - If you plan to re-tile over existing tiles, remove any cracked or loose tiles and skim over where any are removed. The surface of the tiles should be scored to give a key for the adhesive. Clean and de-grease the tiles thoroughly
TILING ONTO NEW PLASTER, PLASTERBOARD, BREEZE OR CONCRETE BLOCK - These surfaces will need to be sealed before you tile, otherwise the moisture in the adhesive will be sucked out and it won't stick your tiles properly. An acrylic primer is usually the best thing to use, although PVA (Polyvinyl Acetate) can be used. Whichever you use, check the adhesive manufacturer's instructions because these will often state which sealant should be used.

If any fittings, particularly boilers, need to be removed before tiling, employ an appropriate contractor and adhere to the regulations, particularly when they are put back. For example, it is now a requirement to fit stop valves or isolation valves on all water pipes to fittings and appliances.
If any electrical or gas fittings need to be touched, always use a professional, qualified person.
Make sure the room you're tiling is as dust-free as possible.

Remember, proper preparation will really make the difference between a good tiling job and a poor attempt which may need re-doing!

Watch out for the next instalment in our 'Tiling Guides' series - PLANNING