Waterproofing of cable and pipe penetrations

1 Penetration

2 Backing

3 Waterproofing
KÖSTER KB-Flex 200
4 Protection layer

Cable and pipe penetrations such as electrical, water and data cables, must be permanently and securely waterproofed against penetrating water. Typically, rigid mortars or foams are used, which prevent the installation of other cables.

Using KÖSTER KB-Flex 200, a permanently plastic material, is a robust and easy way to waterproof against penetrating water, while allowing the installation of further cables at a later stage. The material accommodates cable movements, does not tear, and is permanently resistant against common substances found in soil and groundwater.

Before applying the material, the substrate must be clean and free of loose particles. The substrate can be dry, moist or wet. In cases of pressurized water, a backing is installed in the penetration at a depth corresponding to the installation depth (1.5:1 / Length : Thickness) using a common PU foam. During the installation of the sealing compound, it is important to make sure that is is installed free from voids. Finally, the sealing compound is recessed approx. 1 cm from the wall surface and smoothed with a metal spatula. As a protection layer and to hold the pipe / cable centered, the exposed material is covered with KÖSTER KB-Fix 5.

KÖSTER KB-Flex 200 has good adhesion to all commonly used building materials such as concrete, masonry, mortar, plaster, brick, and all other mineral construction materials, as well as ceramic, PVC, polyethylene and polypropylene. A primer is not necessary.

Always adhere to the specifications in the respective Technical Guidelines.



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