Green Roof Drainage System, Green Roof drain sheet,drain sheet
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.
