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

Cold- and self-bonding bitumen membranes fulfill the standards for the water impact classes W1-E "ground damp" and "non-pressure water" (DIN 18533). They are mainly used for the waterproofing of new buildings and in particular concrete foundation slabs. Herebelow are the working steps for the cold- and self-bonding bitumen membrane weber.tec 913 are described.

Simple & safe to the goal

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

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

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

  4. 4. Inner angles: cut a piece out from the membrane weber.tec 913 (delivered in a roll) in the right size and glue it.

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

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

  7. 7. For a full bonding with the substrate glue the membrane weber.tec 913 on the whole wall surface by pressing with a roller, in particular in areas with joints and connections.

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

  9. 9. Detail of pipe penetration: grind PVC pipes and remove dust. Cut a lip from the membrane and lay it around the pipe and on the wall. And remove dust.

  10. 10. Movement joints: for waterproofing, use the joint sealing tape with end T-piece weber.tec Superflex B 240 Ewhich is glued with the 2-comp. reactive waterproofing slurry weber.tec Superflex D 2 and covered with the same material on its both sides.

  11. 11. Main surfaces: roll out weber.tec 913 and cut in the required length.

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

  13. 13. Roll out the next membrane row in a length of approx. 50 cm. and detach it from the protective paper. First expose the butt joint area, align it in the right position and bond the whole surface, including the overlapping stripe.

  14. 14. The width of overlapping stripe is minimum 8 - 10 cm. Press on 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 joint area.

  15. 15. Lay the membrane downwards over the forepart of the concrete slab.

  16. 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. 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 the floor surface.

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