You will need
  • - saw joints;
  • - roller or sponge;
  • - spatula;
  • - grout;
  • - a solution of vinegar (1:1);
  • sealant;
  • - rags.
First, you need to buy new grout and carefully read the instructions. You can use a special grout, dirt-repelling, for example "Dolphin", "Atlas" or Mapei. Specify how much time is needed to ensure that new joints have dried up. Try to keep the new material coincides with the previous property and the composition, as there is a possibility that the old grout will not be able to remove it completely. In this case, too strong differences in the composition of cements can lead to delamination of the material.
First of all, you need to remove the old grout. This can be done fully or partially (depending on damage). First, treat the seams with a solution of vinegar, and then using the saw seams to get rid of old grout. During this process, be especially careful in order to prevent various chips and damage the edges of the tile.
Released seams moisten with water. Excess moisture should be removed with a soft cloth. Pre-prepared grout put in place with a spatula. Proceed with this as usually when grouting ceramic tile. Don't forget to align the seams between the tiles. It is easy to do with the help of special instrument – pointing.
Remove excess grout with a wet sponge. In order to extend the service life of your new stitches, you can also cover them with a special sealant. This is especially true for bathrooms and other high humidity areas. Sealing seams is only after complete drying of the grout.
After completing all the procedures on your tiles can be unsightly stains and opacities. You can delete them using the same vinegar solution and a soft cloth. RUB the tile until it is completely dry and the disappearance of divorce.
If you changed the grout due to the fact that it crumbled, and the new soon began to behave in the same way, so this kind of grouts are not suitable for the premises. Consult with a specialist, it might be the surface of the wall or floor, or the room is excessively humid.