Building construction


COVERDRAIN FT - Drainage of roof terraces, esplanades and sports grounds


Roof terraces and esplanades must be protected from water ingress and accumulation under slabs or paving stones. An effective drainage system must be implemented to prevent any damage.

COVERDRAIN® FT is intended for rainwater drainage under topsoil or permeable materials (gravel) or concrete slab in contact with an impervious or watertight substrate.

The water drained by COVERDRAIN® FT is discharged via collector drains and/or downpipes through the concrete slab.


  • Alternative solution to the installation of gravel-based drainage
  • Product approved by landscape architects
  • Reduced overload on the slab
  • Savings in materials
  • Promotes sustainable revegetation
  • Carbon footprint reduced by 84% by avoiding the use of granular materials


Drainage Drainage
Filtration Filtration
Mechanical protection Mechanical protection


  • Polypropylene geocomposite
  • Roll width : 1.95 m
  • Roll length : 50 m
  • Output : 1,200 m2 installed per day by two people
  • Diameter of perforated mini-drains : 25 mm
  • Distance between mini-drains : 100 cm

Projects completed with COVERDRAIN FT

Drainage on landscape area concrete slab

Drainage on landscape area concrete slab


Lebanese National Library – Beirut (Lebanon)
3 120 m2

To allow the drainage of rainwater under the concrete slab and thus avoid infiltration and accumulation of water, the COVERDRAIN FT solution was installed on the forecourt of the Lebanese National Library.