Waterproofing joints in bathroom and kitchen

In damp areas, joints should be as watertight as possible to protect against damage. Connection joints are therefore usually sprayed with water-repellent silicone, while the specialist uses waterproof mortar for tile joints. Learn how to seal joints effectively in this advisory article.

Seal the joints with silicone

The use of silicone is mainly recommended in the connection areas around the sink and wash basin as well as on the edge of the bath and shower tray. This material is highly moisture-repellent and protects such edge areas against the ingress of water.

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  • Before sealing the joints with silicone, ensure that the substrate is stable and clean.
  • If necessary, mask the joint edge areas with painter's crepe.
  • Inject the silicone into the joint with a cartridge gun.
  • Smooth the surface with a rounded spatula, which you previously dip in detergent water.
  • Pull off the masking tape quickly at an oblique angle.
  • Let the silicone joint dry for several hours according to the instructions for use.

Use waterproof grout for sealing

To seal joints indoors, it is advisable to use waterproof mortar when laying the tiles. In this way you prevent tensions or mold from forming in the mortar (€ 7.79 at Amazon *) due to the constant action of moisture.

Waterproof grout (€ 17.59 at Amazon *) is mixed with elasticizing plastics that close the pores of the hardened material. Such types of mortar are not only suitable for sealing joints, they also prevent the formation of cracks due to subsurface movements.

Subsequently seal joints in damp areas

If your tile joints have a water-permeable mortar, this can also be subsequently sealed with a sealant. The joint sealing not only protects against water, but also repels dirt more strongly than the coarse-pored mortar surface. Thats how it works:

  • Renew damaged joint areas and create a clean and stable surface.
  • You can use a special cleaning agent recommended in the instructions for use for the sealant.
  • Carefully apply the sealant to the joints with a brush or a small sponge to seal them.
  • Remove any excess material with a rag as soon as possible.
  • Let your joint sealant dry thoroughly according to the instructions for use.
Tips & Tricks Spotty joints that can no longer be cleaned properly can be colored with a joint paint before sealing. Your tile joints will look like new at the end of the work!