Waterproof joints in bathroom and kitchen

In wet areas, joints should be as watertight as possible to prevent damage. Connecting joints are therefore usually sprayed with water-repellent silicone, for tile joints, the specialist uses waterproof mortar. Learn in this guide how to effectively seal joints.

Seal joints with silicone

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

  • Before sealing the joints with silicone, ensure a firm, clean surface.
  • If necessary, glue the joint edge areas with painter's crepe.
  • Inject the silicone into the joint with a caulking gun.
  • Smooth the surface with a rounded spatula, dipping it in detergent water beforehand.
  • Pull the masking tape off quickly at an oblique angle.
  • Allow the silicone joint to dry for several hours according to the instructions for use.

Use impermeable grout for sealing

For sealing joints indoors it is recommended to use impermeable mortar immediately when laying the tiles. This prevents the permanent build-up of moisture in the mortar from causing tensions or mold.

Waterproof grout is mixed with elasticizing plastics that seal the pores of the hardened material. Such mortars are not only suitable for sealing joints, they also prevent the formation of cracks due to underground movements.

Seal joints in damp areas afterwards

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

  • Renew defective joint areas and create a clean and stable surface.
  • For cleaning purposes, use a special cleaner suggested in the instructions for use of the sealer.
  • Carefully apply the sealant to the joints with a brush or a small sponge to seal them.
  • Remove any excess material as quickly as possible with a rag.
  • Allow your joint seal to dry thoroughly in accordance with the instructions for use.

Tips & Tricks

Spotty joints that can not be properly cleaned can be colored with a joint color before sealing. This is how your tile joints look like new at the end of the work!

Video Board: How to Seal Around A Tub Or Shower