New floor tiling
The flooring in any bathroom, along with contrasting wall tiling, plays a vital role in bringing together floor-standing sanitaryware such as WCs, bidets and baths. Good flooring must also perform two key functions: it must be practical, providing a sound, safe surface underfoot as well as being a thing of beauty in itself in order to complement and harmonise the room.
Types of floor tiles
The choice of bathroom floor tiling is many and varied, ranging from easy to lay mosaic sheets to rustic marble, ceramic and even terracotta. All sizes, shapes and colours imaginable are available so one must take time at the planning stage to get it right. There are many specialist tiles shops in every town but one of the best sources of quality bathroom tiles available nationally is Fired Earth, who have a vast range as well as experienced staff to advise on product suitability.
Things to consider
Having great tiles is one thing, but it will count for nothing if you do not do your preparatory work first. The vast majority of bathroom sub-floors are of standard timber floorboard construction which is subject to movement and will cause cracking in any floor tiling and grout simply laid on top.
In order to mitigate the effects of movement, one should fix an 18mm WBP grade plywood floor over the existing floorboarding ensuring that all underfloor pipework is checked first and all existing timber floorboards are firmly screwed back in place.
The plywood floor must be screwed down at 150mm centres to ensure complete stability. Take care in selecting the right length of screw so that none penetrate below the floorboards risking damage to pipework or cabling.
If your floor is concrete screed, ensure that it is perfectly level and if necessary, use levelling compound to create a perfectly flat surface to tile over.
The finished floor level including new tiling and adhesive bed will also require any inwardly opening door to be cut shorter to accommodate the new floor height. You may need to adjust the height of the threshold between the bathroom floor and the outside landing/room if this drop in level is substantial.
Difficulty level: 3/5
Tools you'll need:
- Spirit level
- Tile adhesive applicator
- Sponge and bucket
- Tile cutter (a hired diamond cutting disc is best)
- Profile gauge
- Chalk line and pencil
- Tape measure
How to do it
1. Plan the room layout first by drawing a scale diagram of the bathroom. Mark the centre of the room by measuring across from wall to wall and making a chalk line cross in the centre. Lay the tiles out dry at first from this centre point to check how they line up with the wall. Some walls are uneven so doing a dry run will allow you to see how the finished tiles will line up against the wall.
2. Having previously applied a PVA adhesive wash to the plywood floor and allowed it to dry, spread a layer of proprietary waterproof bathroom tile adhesive in small areas at a time, placing tiles down and checking with a spirit level that each tile is laid level as you go. If appropriate, use tile spacers. Mosaic tile sheets can simply be eased into place and butted up against each other.
3. When you arrive at the wall, measure the distance from the line of tiles to the wall and cut the tile accordingly to fit. For awkward areas around bathroom fitments such as WCs and shower cubicles, use a profile gauge and draw a pencil line on the tile so that you can cut accurately. A hired diamond tile cutter will give a much more professional finish.
4. When the floor is laid and fully dry, apply bathroom tile grout following the manufacturer's instructions and using a damp sponge. Work the grout into each gap. Buff dry with an old rag ensuring that no grout is left on the tile surface. When fully dry, apply clear bathroom tile sealant or any product as recommended by the tile manufacturer.