Sealing slurry under tiles protects against mold growth

As you may know, sealing slurry is part of basement renovation in order to protect it from ingress of water. But did you also know that sealing slurry should definitely be applied when renovating a bathroom? We'll tell you why.

Why does sealing slurry belong under the tiles?

A tiled room is waterproof you will think. But over time, the moisture diffuses through the joints or the silicone seal into the underlying masonry without you noticing.

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The moisture can escape, but in the shower area, which is often used, or in windowless bathrooms, the exchange becomes more difficult. The result is mold that you won't even notice at first.

Mold is harmful to health and difficult to remove from a damp wall. The only remedy is for the masonry to dry out. In the worst case, you will have to spend a lot of time renovating your bathroom. For these reasons, the application of a sealing slurry is recommended when renovating bathrooms and showers.

Where a sealing slurry is required?

The sealing slurry under the tiles in the shower, around the bathtub and in the spray area of the same is important. If you want to be on the safe side, you should apply the sealing slurry around the wet area of sinks, bidets and the like.

Sealing slurry is also required on terraces or balconies, where tiling will take place later. In this case, make sure that you use a flexible waterproofing slurry for outdoor use. The sealing slurry forms a waterproof layer that prevents moisture from penetrating the masonry.

And this is how you proceed:

  • Remove old loose plaster, paint residues, dirt and dust
  • Fill cracks and holes
  • Paint a deep primer on highly absorbent walls (€ 4.99 at Amazon *)
  • Apply sealing slurry with a brush, paintbrush or painter's brush
  • Paint the walls first, then the floor
  • Pay attention to the drying time for a multi-layer coating (two layers are recommended)
  • Avoid drafts and direct sunlight, the sealing slurry must dry slowly
  • After the specified drying time, floors and walls can be tiled.

Tips & Tricks If you want to lay tile on tile, you can also apply the sealing slurry to the old tiles. However, you should be sure that there is no moisture underneath.