Typical Roofing Components Details
Component
Rooftop Garden System
Reference Section
structural support
Steel / wood structure, ply wood deck
vapour control layer
Asphalt-based membrane
thermal insulation
75mm (3in) thick mineral fibre board
support panel
12.5mm (0.5in) fibreboard
Membrane
250g polyester reinforced modified bituminous membrane formulated with root repellant agent
250g polyester reinforced modified bituminous membrane
drainage layer
Polystyrene extruded panel, 0.75kg/m2 (0.15psf), 36mm (1.5in) thick
N/A
filter membrane
Polyethylene/polyester non-woven mat, 160g/m2 (0.032psf)
growing medium
150mm (6in) light weight soil
Vegetation
wild flower meadow
Source: Rooftop Garden Consortium, Ottawa
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References
1 Bass, B., 1999: Modeling the Impact of Green Roofs on Toronto’s Urban Heat Island. Environment Canada, Green Roofs for Healthy Cities. 2 Roofscapes, Inc., Green Technology For the Urban Environment., (www.roofmeadow.com), C. miller