Horizontal waterproofing under walls

The waterproofing must be all of a piece, if the critical facade socket part and the groove area (angle between concrete slab and basement wall) below ground level of buildings are to be permanently protected against moisture penetration. After all, this is one of the areas of the building that is subjected to the highest stresses. Extreme temperature fluctuations, splash water, salts and constant freeze-thaw cycles in the wet and cold season in the facade socket area. And the greatest water load is located at the socket part of the building. Especially there, the waterproofing layers must have a force-fit bond with the substrate and with one another. In addition, the horizontal barriers made of mineral waterproofing materials must be able to withstand the pressure of the rising walls and connect seamlessly to the floor and wall waterproofing.

Simple & safe to the goal

  1. 1. Drawing of the wall/floor connection when the horizontal barrier is executed with a cement-based waterproofing slurry.

  2. 2. Drawing of the socket part, double-shell construction with facing masonry and horizontal barrier with a cement-based waterproofing slurry. The 2-comp. flexible waterproofing slurry weber.tec Superflex D 2 is connected to the bitumen waterproofing wall membrane in the upper part.

  3. 3. Scratch test: a manual test to determine whether cement laitance is present on the concrete surface. Existing cement laitance layers must be removed mechanically, as they often detach from the substrate and do not provide a sufficient underlay for waterproofing.

  4. 4. For consolidation and dust binding of absorbent substrates, apply the all-purpose primer weber.prim 900, mixed with water in a ratio of 1 : 1 part by volume. This creates a surface with optimal bonding for the following waterproofing.

  5. 5. The flexible and quick-setting waterproofing slurry weber.tec Superflex D 2 is applied under walls in 2 layers, using a block brush.

  6. 6. Waterproofing of the socket part in 2-layers with weber.tec Superflex D 2 or weber.tec Superflex D 24 (2-comp. reactive and quick-setting waterproofing coating) for double-shell construction with facing brickwork. In the upper part the pre-said waterproofing is connected to the bitumen waterproofing wall membrane and in the lower part down to the foundation overhang. In case of buildings with basements, the mineral waterproofing is carried out approx. 20 cm below ground level.

Find all our products near you in more than 2000 outlets