GU KSK sheet for structural sealing

Subsurface preparation

• The substrate must be prepared in accordance with DIN 18195-3 (waterproofing of buildings) and DIN 1053 (masonry construction). Substrates must be stable, level, suitable for coating, frost-free, and free of oil, grease, bitumen, nests, gaping cracks, ridges, impurities such as dust, dirt, remains of mortar and sinter layers. Grooves must be rounded and edges chamfered. Work can be carried out on dry or slightly moist substrates
• Mineral substrates must be primed with an undercoat such as GU primer. No primer is required for metal and plastic surfaces. Wet substrates, which can be identified by marked darkening and a film of moisture on the surface, must first be sealed off against moisture penetration from the back using a slurry seal
• Water must not get between the substrate and the seal during the construction phase, for which reason a mortar or slurry seal suitable for temporary sealing should be used, if appropriate
  Open butt joints of up to 5 mm should be filled and levelled with a scratch coat of thin plaster. Bubble formation as a result of deep pores or cavities in the concrete should also be prevented by applying a scratch coat. The scratch coat must be dry before beginning the sealing works. Open butt joints or depressions that are larger than 5 mm should be filled with a barrier mortar

Processing
1. Primer

• Apply undiluted GU primer with a paintbrush evenly to the dry or slightly moist substrate. Once the primer has dried sufficiently, apply the GU KSK sheet for structural sealing. Before doing so, stick a small strip of the sealing sheet to the primer, press firmly and then tear off again. If more than 50 % of the primer comes away from the substrate, there is not yet sufficient adhesion. In this case, gluing the sealing sheet must wait until a later time. Sufficient adhesion has been achieved if the sealing sheet can only be detached from the substrate with exertion
• If gluing is to be carried out in the morning, be aware of the potential for dew formation on the primer. This can occur in the event of unfavourable climate conditions, especially where the wall meets the ground. As gluing cannot be carried out on a dewy surface, a dry substrate must be created, e.g. by drying/evaporation

2. Preparation and application

• Using a sharp knife, cut the GU KSK sheet for structural sealing to the necessary size and length on a board (backing paper downwards) and then roll up again
• The GU KSK sheet for structural sealing is then glued to the substrate over its entire surface by simultaneously removing the backing paper. In wall areas, apply vertically from top to bottom
  The following steps must be observed:
  • At the start of the membrane, remove approx. 30 cm of the backing paper slowly and evenly
  • Place the sticky side onto the substrate and stick it down. Continue to remove the backing paper evenly
  • In the same work step, press the membrane down using a brush or cloth, for example, starting from the centre, to avoid creases and air bubbles between the substrate and the film and to achieve good, instantaneous adhesion
  • Next, press the entire membrane down firmly, e.g. with a rubber roller
  • Before applying the subsequent membranes, remove the protective film from the vulcanisation strip
  • Apply the subsequent membrane with an overlap of approx. 10 cm, and at least 8 cm. A 10 cm scale is provided on the membrane. Take particular care when starting to roll these overlap regions
  • After approx. 24 hours, the GU KSK structural sheet for sealing will exhibit 100 % adhesion to the substrate

3. Vertical wall sealing

• The upper end of the web should be secured to vertical surfaces using plastering guides

4. Gluing insulation boards and drainage panels

• After sealing with GU KSK sheet for structural sealing, both insulation boards and drainage panels can be attached by spot gluing

5. Filling in the construction pit

• After completing the sealing and insulation operations, the construction trench should be filled in within 72 hours

Processing hints when using for Z or L flashing in veneer masonry

• Using a sharp knife, cut the GU KSK sheet for structural sealing into lengths of approx. 1 m on a board. With the long side upwards, first glue it to the masonry backup, which has been undercoated with GU primer
• At the start of the membrane, remove approx. 10 – 15 cm of the backing paper slowly and evenly
• Arrange the sticky side of the sealing film on the backup and attach by pressing gently
• Glue to the substrate over its entire surface by simultaneously removing the backing paper. Press the sealing sheet down using a brush or cloth, for example, starting from the centre, to avoid creases and air bubbles between the substrate and the film and to achieve good, instantaneous adhesion
• Next, press the entire membrane down firmly, e.g. with a rubber roller
• Before applying the subsequent membranes, remove the protective film from the vulcanisation strip
• Apply the subsequent membrane with an overlap of approx. 10 cm, and at least 8 cm. A 10 cm scale is provided on the membrane. Take particular care when starting to roll these overlap regions
• For veneer masonry, the sealing sheet is positioned high behind the veneer on the outside of the internal wall and incorporated into the masonry, if appropriate (Z flashing)
• When using for Z flashing, a sufficient overlap (≥ 10 cm) should be observed at the connection to the external basement seal
• When using for L flashing, the cut edge of the sealing film in the joint area of the veneer should be folded over in such a way that adhesive compound sticks to adhesive compound
• Horizontal forces in the walls (e.g. due to earth pressure) should be eliminated
• The load of the masonry on the sealing sheet should not exceed 0.2 MN/m²nicht überschreiten
• The seating for the veneer should be horizontal and without irregularities that would damage the membrane