Renew joints expertly


Joints are extremely vulnerable to external environmental factors. Therefore, the renewal of the joints is a work that can be due again and again at long intervals. Here you will receive detailed instructions for the professional renewal of tile joints.

Grout age and therefore the joints must be renewed at great intervals

Grout consists inter alia of cement. Although joint compounds are also water-repellent, but not waterproof. The result of this is the fact that joints tend to literally crumble. The penetrated water begins to work in the joint and it comes to efflorescence. Under no circumstances can you just apply new grout to the old grout. As is often the case with renewal of joints, the preparatory work is decisive for the final result. Even if the majority of the work carried out later will no longer be visible - the service life of the new joint compound is even longer, with the joints then looking new for a correspondingly long time.

Step-by-step instructions for the professional renewal of joints

  • grout
  • primer
  • Sperrgrund
  • water
  • silicone
  • scraper
  • Fug board or squeegee (rubber)
  • Sponge board or tile sponge
  • silicone syringe
  • wooden spatula
  • Cutter knife

1. Preparatory work before renewing the joints

First you have to remove the old grout completely. It is best to use a joint scraper. There must not be any traces of grout left in the joints. Otherwise, the new grout can also decompose faster, as it may cause efflorescence.

2. Priming the joints

Depending on the substrate, it may be useful to coat the joints with a primer or primer. Depending on the primer used, strongly or non-absorbent substrates are adapted to the needs of the grout. If you want to re-grout a wet room or outdoor tiles, applying a barrier layer is also recommended.

3. Renew the joints

Primers must be allowed to dry according to the manufacturer's instructions. Now you can touch the grout. Use precisely dosable grout and water quantities. So make sure the color of the joints is even later.

Now brush the grout into the joint diagonally to the joint. This ensures that the joints are all filled evenly and even to the ground.

4. After renewing the joints, wash out the new grout

Allow the grout to dry slightly. If the grout no longer shines but looks dull, you can start washing the joints. Also flush the joints diagonally to the joint with a sponge and water. Here, too, you ensure that the grout remains uniformly high and thus forms a uniform color.

5. Replace the expansion joint

Finally, you can renew the expansion joint. Cut out the old silicone with a cutter knife. Fill in new silicone with the silicone syringe. Then remove excess silicone with a spatula. With the moistened finger, smooth the joint.

Tips & Tricks

The grout can also be destroyed if the substrate is wet. In this case, it will not help you to renew the joints - you need to get to the root of the problem and do a thorough renovation.

If possible, use flexible grout. This is much more resistant than conventional grout.

For open-pored tiles (polished porcelain stoneware, some natural stone) you should apply the grout on a test surface that will not be visible later. So you can determine if the grout penetrates into the open-pored tiles. Otherwise, the impregnation of the tiles is advisable in advance. Here you will also find articles on [impregnating tiles].


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