Harrowden offers a tough cuspate drainage board with integral filter fleece that is ideal for intensive and semi-intensive green roofs, providing irrigation and drainage.

Composition

A 20mm black HDPE (high-density polyethylene) punched cuspate drainage board with a geotextile filter fleece bonded to a single side (top).

The 20mm cuspate provides water storage of up to 4 litres per square metre with 10mm-diameter punched perforations, ensuring an overflow performance of 24 l/m²/s. The bonded filter fleece stops small particles from washing into drains without hindering water permeability. Sold per linear metre.

Specification

  • Width: 0.97cm

  • Depth: 20mm

  • Water storage capacity: 4 litres/m²

Features

  • Optimised for maximum strength and performance

  • UV-stabilised

  • High crush and puncture resistance

  • High flow rate

  • Easy to cut

Performance

  • Water storage capacity: 4 l/m²

  • Water Flow: 24 l/m²/s

Important

Although this product has been UV-stabilised it is advisable to store it out of direct sunlight until it is used.