Developed to provide high flow capacity and waterproofing with the incorporated geotextile filter. gtDeckdrain is durable and sufficiently robust to resist mechanical stresses imposed during installation and throughout its lifespan.


gtDeckdrain is a high performance geocomposite drainage system. Designed to provide an environmentally friendly alternative to traditional structural drainage techniques, it delivers high flow capacity and added protection to waterproofing.

gtDeckdrain is used in civil engineering and construction drainage applications; including bridge abutments, buried structures, retaining walls, tunnels, roof gardens and covered potable water reservoirs. gtDeckdrain geocomposite consists of a high strength, flexible polyethylene cuspated core with a non-woven filter geotextile bonded onto one or both sides. The geotextile filters a wide range of materials whilst allowing water to percolate into the core of the geocomposite before draining to a discharge point.

The HDPE cuspated core of the geocomposite provides a free flowing drainage void. The cusps are designed to support the geotextile which is bonded to the core, to ensure that it doesn’t deform into the drainage void under the pressure of the backfill material. gtDeckdrain is designed to allow flow in all directions, unlike linear or pipe systems.

gtDeckdrain Applications

  • Roof garden drainage
  • Relief of external water pressure from buried structures
  • Highways Bridge abutment and wingwall drainage
  • Structural drainage on rail projects
  • Drainage on Green Bridges
  • Drainage behind retaining walls
  • Covered reservoir roofs and walls
  • Tunnel drainage
  • Block paving drainage
  • Relief of uplift pressure beneath tanks, slabs and culverts
  • Capillary break layer below base slabs
  • Structural drainage
  • Green Tunnels

gtRoofdrain Benefits

  • Horizontal or vertical drainage applications (walls)
  • Thinner drainage layers when compared to traditional aggregate drainage solutions
  • Reduced dead loads on structure means thinner slabs are possible
  • High, factory controlled consistent flow capacity
  • Wide rolls of gtDeckdrain available to enable rapid installation
  • Enhances the performance of structural waterproofing by providing an additional barrier that prevents the majority of water reaching the liner
  • High CBR puncture resistance of gtDeckdrain provides protection
  • Allows use of lower specification backfill
  • Reduced delivery traffic volumes when compared with stone delivery vehicles

Downloads & Datasheets