Watec®Drain KP is the only capillary passive thin-layer drainage system that is laid loose, i.e. without bonding to the substrate. The 100% decoupling and drainage ensures that frost damage and efflorescence are prevented, and speeds up the drying of the structure considerably. The Watec®Drain RD drain gully makes it possible to have standard-compliant door threshold connections, even with low connection heights.


  • Unique, capillary passive thin-layer drainage mat, laid floating.
    A 6 mm layer of air speeds up the drying of the structure.
    100% decoupling provides protection from cracks in the covering and delamination due to weather-related shear stress.
  • Diffusion slits allow ventilation of residual moisture from cementitious substrates.
  • The only thin-layer drainage mat with a system drain grate.
    Makes standard-compliant reduction of door threshold heights possible.
  • Unique combination of intelligent special fleece and additional mesh reinforcement.
    Special fleece with low through-flow resistance for quick drainage The mesh provides optimum rigidity and adhesion.
  • Can be used for falls from as little as 1 %.
  • 5 year system warranty.

Brief technical information

Area of application Privately used walk-on outdoor surfaces such as balconies and terraces and walkways for residential access areas.
Types of covering Frost-resistant and dimensionally stable coverings and moisture-insensitive coverings for outdoor areas, such as those recommended by the covering manufacturer for the respective usage area and the respective laying method.
Substrates • Bonded substrates, concrete surfaces with or without waterproofing, not to be laid directly onto gravel
• Old tiles, old coverings
Load-bearing capacity Surface load capacity up to 3,000 kg/m²; cannot be driven on
Footfall noise improvement Up to +17dB
Fall-related drainage capacity 100 % = 2.62 l/(m*s)
10 % = 0.78 l/(m*s)
1,5 % = 0.28 l/(m*s)
Insulation Laying Watec® Drain KP+ directly onto thermal insulation is not permitted. Additional load-distributing layers (cement screeds) are required here.

Components & accessories