Terrax is a dimpled sheet with a geotextile layer which acts as a surface layer. Normally used as a green roof external drainage layer, it also protects the primary waterproofing applied to substrate. Laminated on to the dimpled sheet, a layer of compression-resistant permanent filtration geotextile prevents the dimple structure from being clogged up by sludge, guaranteeing optimum long-term drainage.

Terrax is an external membrane that can be used vertically and horizontally.

The membrane has an adhesive tape manufactured on one side to overlap and join to the next part of membrane.

Features, benefits and applications

  • Reliably protects and insulates waterproofing layers against mechanical damage

  • Withstands extreme compression loads of 400 kN/m2 (up to type-60 heavy trucks, depending on the covering)

  • High drainage capacity prevents frost damage and encrustations

  • Water-vapour pressure is drained away through the structure

  • Water drainage capacity exceeds that of gravel or chipping layers

  • No obstruction by sludge underneath the covering layer

  • Good load distribution prevents point loads on the waterproofing layer

  • Resultant static building loads lower than those of gravel layers

  • Easy and cost-efficient installation

Product details

  • Product code: DMS025

  • Material: high density polyethylene

  • Temperature resistance: -30 to +80°C

  • Stud height: approx. 9mm

  • Roll size: 2.4 x 12.5m

  • Compressive strength: approx. 400 kN/m2