Drain Sheet (HUWA),drain sheet, drainage sheet, water drainage sheet

  Green Roof  Draniage System

provides key drain components for successful greenroofs:

Root Barrier Fabric Drain Core Composites Filter Fabric

Greenroofs must

have a drain

layer to prevent

water from

accumulating on

the roof or in the

substrate. Good

roofing practices

require no water

ponding.

Greenroofs are no

exception.

A drainage expert should

be consulted regarding the

physical characteristics of

the drainage & filter fabric

layers to assure they

provide adequate water

flow for peak rainstorms.

Drain layer is a pre-assembled

greenroof drainage system,

consisting of a high strength plastic

core & two layers of geosynthetic

fabric attached top and bottom.

Lightweight and easy to install

High strength and crush resistant

High Flow capacity

Pre-assembled drain system

Built in water retention chambers

Low cost

Reduces weight of total system by eliminating

sand or gravel

Prevents root penetration into drain layer

Filters fine particles & ensures drainage

efficiency

Unimpeded drainage is assured in

greenroof systems because the

drain layer is applied over the

entire roof area.

The drain layer serves the dual

purpose of keeping the soil well

aerated & in some cases also acts

as a water retention layer.