Preparation of groove parts of internal masonry basements

The internal masonry socket part is precisely the area where different building materials meet together, and the highest humidity impact will often exist. Because this area is the lowest part of the building, and situated near to water location. There old coverings, screed and render must be removed in general. Also the damaged joint network must be scraped out in a depth up to 2 cm. The aim is the provision of a load-bearing substrate with open capillarity, with which the new waterproofing can have a good key. For the preparation works best practice is to use sand-blasting with solid particles. The choice of an appropriate preparation method depends on the type of substrate and the chosen waterprofing system.

Step by step


    1. Carry out the waterpoofing as tanking. The goal of water-proof tanking is to encase the entire envelope of the below ground structure to protect it from water ingress. Each waterproofing layer/section must overlap by at least 20 cm. Existing coverings, screed and render in transition areas with the wall, are to be removed.


    2. Chisel a recess of 4 x 4 cm in the angle wall/floor; it will provide a good key for the subsequent watertight mortar weber.tec 933 with the substrate.


    3. The recess in the area where a bitumen sheet is laid (usually in the first masonry row), will impeed the uprirising damp between waterproofing and masonry.


    4. In connection with binding cross walls (for ex. inner walls) with outer walls a complete separation of the transversal wall can be carried out, in order to obtain a throughout (without "break") internal waterproofing.


    5. Ensure that all necessary slots are done for instal-lations to be fixed in the wall-cross sections prior to waterproofing works, so that the waterproofing layers can be applied behind the installations.


    6. Alternative: a vertical  damp-proof barrier as capillary waterproofing with the liquid injection resin weber.tec 940 E or the injection cream weber.tec 946 can be installed in this area.