Sealing slurry or bitumen - what distinguishes the two

Bitumen and also sealing slurry are suitable for sealing buildings. Both sealing methods are usually used separately from one another. But you can also apply sealing slurry to bitumen or vice versa.

What is the difference between bitumen and waterproofing slurry?

When it comes to the question of whether sealing slurry or bitumen are used, the properties of both materials play a role. While bitumen mostly plays a role on the outside of buildings, sealing slurry is mainly used inside. We differentiate between rigid mineral waterproofing slurry, flexible waterproofing slurry and a thick coating with bitumen.

  • Also read - Sealing slurry and bitumen - Double protection
  • Also read - plastering sealing slurry? Is the?
  • Also read - Sealing slurry under tiles protects against mold growth

What is a rigid mineral sealing slurry suitable for??

It is used both inside and outside, but is not crack-bridging. Mineral sealing slurry protects against soil moisture and non-accumulating water on floor slabs or walls. In addition, the slurry is used for horizontal sealing in walls and for sealing in damp areas such as showers or in the bathtub area. Rigid sealing slurry can be used on the following substrates:

  • concrete
  • Masonry (structure-tight, joint and flush)
  • Cement screed
  • Cement plaster

What is flexible insulation slurry suitable for??

It serves the same purpose, but has a crack-bridging and non-cracking effect due to the addition of plastic additives. That is why they are mainly used on exposed balconies and terraces as sealing slurry under tiles, to seal ponds or to seal swimming pools. Flexible sealing slurry can be used on the following substrates:

  • Base and areas in contact with the ground
  • concrete
  • Concrete slabs
  • Tiles
  • Paving

What is bitumen suitable for??

Contrary to the sealing slurry, which is of mineral origin, bitumen is obtained from petroleum. To make it flexible, water, emulsions and various plastics are added to the bitumen. Bitumen ensures permanent sealing of components that come into contact with earth. Bitumen is also used in the plinth area to protect against splashing water or on roofs. Bitumen can be used on the following substrates:

  • Base and areas in contact with the ground
  • concrete
  • Masonry

The comparison of the main differences

Material sealing slurry Flexible sealing slurry bitumen
Open to diffusion Yes Yes No
Crack bridging less than 0.5mm less than 0.4 mm Yes
application inside and outside predominantly outside
Tips & Tricks Regardless of whether you use sealing slurry or bitumen or both, both materials can only seal properly with the right preparation of the substrate. Therefore, make sure that you work cleanly so that the moisture stays outside forever.