If you have laid ceramic floor tiles you will need to grout them just as you would wall tiles, in exactly the same way, but ensure that the adhesive has had time to dry, this is normally about twenty four hours, but you should always consult the manufacturer of the adhesive, if in doubt leave it for a couple of days if you can.
The grout material itself can come in two forms, either ready mixed in a tub, or in a powder from a bag. The powder style will be the cheaper of the two, but ensure that you follow the manufacturer’s instruction regarding the amount of water to use, it is critical this is right. Normally the grout will be white in colour, but you can get powders to mix in, or if ready mixed, the colour will be already added.
With floor tiles a standard grout will usually be alright, bit if the tiles are in a shower or a bath surround, a waterproof grout should be used. Applying the grout is simple and should be done with a grout spreader; this should be loaded with the grout and applied to the tiles across the face and into the joints. Excess grout should be removed as you are working and when you have covered the entire area, wait about fifteen minutes and then using a clean damp sponge wipe the tile diagonally across the grout line, rinsing out the sponge as you go along.
When the grout has hardened, this will take about two hours, use a grout stick and smooth out the joints which will give it a professional look. When the grout has completely dried, use a clean dry cloth and polish the tiles clean of grout from the surface. Stand back and admire a highly professional job, which has been well done.