This system is designed for extensive green roofs with a substrate level of between 70mm and 200mm.
The vegetation can be grass, sedum blankets, sedum/wildflower mixes, herbs or bio-diverse (brown roof) plants; depending on the wishes of the client.
Each layer or component is supplied separately in bag or roll form and installed separately as a “dry” build-up. This allows easy access to roof areas.
This system is ideal for large scale areas, unlevel or more complicated decks as it is flexible and “built into” the existing structure.
The Build-up
From the upper surface, working down:
Vegetation – standard products either
grass grown from Pro-grass pre-seeded biotextile,
sedum blanket or
sedum/wildflower mix
Growing medium/substrate at an absolute minimum of 70mm deep up
to 200mm, containing
crushed lecca or crushed brick
green waste (up to 30%)
peat (10%)
locally sourced marine aggregate and grit
12-14 month release fertilizer (if required)
Geotextile filtration layer
20mm perforated Protectodrain 20P
Geotextile filtration layer
Wallbarn 3mm Protectoboard (where appropriate)
Grass finish:
Using Pro-grass biotextile fabric and laid into a substrate 200mm
Can tolerate higher level of traffic
Grass takes approximately 4 weeks to grow and is fully established after 4 months
Less rainwater runoff (up to 60% retained)
Regular maintenance and irrigation required
Saturated weight up to 150kg per m2
Sedum blanket:
70mm substrate
Sedum supplied in established (9 month old) blanket
Instant green roof
Very low maintenance, weed clearance once per year
This system is designed for extensive green roofs with a substrate level of between 70mm and 200mm.
Grass finish:
Sedum blanket:
Sedum/wildflower blanket:
Brown roofs:
Plug planted extensive roofs: