Features and Benefits

For reliable and flexible sealing of room corners


  • With special bond breaker
  • Flexible permanend bond
  • Resistant to chemicals
  • Watertight
  • High elasticity
  • Permanent adhesivebond
  • Water & alksali - proof
  • Tearproof
  • Resistant to ageing
  • For indoor and outdoor use
  • Width: 120 mm

Read More

Crack-bridging, 3-layered waterproofing and uncoupling membrane CL 69 Ultra-Tight is a trouble-free alternative to liquid-applied waterproofing products for the composite waterproofing of balconies and terraces and wet rooms. It ensures rapid work progress. Due to its uncoupling effect, CL 69 is suitable for the installation of ceramic tiles and slabs on critical substrates as well as for the removal of tile coverings.

Step by step

The substrate must be solid, dry, clean and free of substances that may impair adhesion. A few isolated cracks in the screed do not cause a problem as long as the crack edges are level. Before applying the CL 69 membrane, pipe penetrations as well as wall and floor connections (gullies etc.) should be waterproofed with the prefabricated Ceresit system components. It is important to seal the connections with FT 101. Butted joints should be avoided. Refer to the Technical Data Sheet and working description!

Place the CL 69 membrane on the floor and cut it to size using a cutting knife and scissors. Comb a certified Ceresit tile adhesive onto the prepared substrate using a notched trowel (notch size 4 mm). Place the membrane into the adhesive bed within the open time of the adhesive.

In the seam/butt area, the membrane strips must overlap by at least 5 cm. The joints must be bonded with FT 101 to ensure a waterproof seal. The sealant is applied void-free along the edge of the first membrane strip. Within the open time, the second membrane strip is placed next to it and pressed down in the overlapping area.

After installing the membrane on wall areas, ceramic tiles and slabs can be fixed directly without any waiting time or further priming coat.