Basement waterproofing with cold-applied and self-bonding bitumen membranes

Cold-applied and self-bonding bitumen membranes fulfill the standards for waterproofing "ground damp" and "non- pressure water" (DIN 18195 - parts 4 and 5). They are mainly used for the waterproofing of basement walls and concrete slabs in new buildings.

Step by step


    1. The substrate must be clean; all masonry joints must be fully closed and angles be rounded.


    2. Horizontal and vertical inner angles must be rounded in groove form with the watertight mortar weber.tec 933.


    3. Apply the solvent-based bitumen primer weber.tec 913 VE in a temperature range from -5°C up to +5°C. Above +5°C use the bitumen primer weber.tec 902.


    4. Inner angles: cut a piece out from the cold-applied self-bonding bitumen membrane (delivered in rolls) weber.tec 913 (delivered in rolls) in the right size and glue it.


    5. Outer angles: cut a piece out from the membrane in the right size and glue it.


    6. Groove area (angle wall/ floor): cut a piece out from the membrane in the right size and glue it overlapping in the groove area.


    7. For a full bonding with the substrate glue the membrane on the whole wall surface by pressing with a roller, in particular in areas with joints and connections.


    8. Connection wall/wall: same procedure like for outer angles.


    9. Pipe penetrations: grind PVC pipes. Cut a lip from the membrane and lay it around the pipe and on the wall.


    10. Movement joints: they are water-proofed with the sealing tape weber.tec Superflex B 240 E (with end T- piece) which is glued with the  2-comp. reactive water-proofing slurry  weber.tec Superflex D 2 and covered with the same material on its both sides.


    11. Main surfaces: roll out the mem-brane and cut in the required length.


    12. Masking paper: remove it from the overlapping area of the already bonded first membrane row.


    13. Roll out the next membrane row in a length of approx. 50 cm. Make the over-lapping side free and install the row face to the wall in the right position. Bond full-surface and press, including the overlapping area.


    14. The overlapping width is minimum 8 - 10 cm. Press this area with a roller or a brush in order to eliminate wrinkles and air bubbles. Afterwards press on the whole surface, including the butt side.


    15. Apply the mem-brane downwards over the forepart of the concrete slab.


    16. Use the drainage and protection foil weber.sys 983. Fix it with the metal rail weber sys 983 A at the membrane upper part.


    17. Remove masking paper in the overlapping area of the first membrane row which has been applied on the floor.

  18. 18. Bonding of the membrane on floor surface.

  19. 19. For a full-surface bonding press the whole surface and the overlapping areas with a roller or a brush.