Building Construction Handbook, Eighth Edition

Typical extensive roof build up ~

grass/sedum

soil

filter layer or fleece

drainage layer*

waterproof membrane

insulation

vapour control layer

reinforced concrete

roof structure

* typically, expanded polystyrene with slots

147 kg/m^2 saturated weight x 9.81 = 1442 N/m^2 or 1.44 kN/m^2

Typical intensive roof build up ~

filter layer or fleece

drainage layer

water retention fleece

over waterproof membrane insulation

vapour control layer

reinforced concrete

roof structure

Depth to vcl, approximately 560 mm at about 750 kg/m^2

saturated weight. 750 kg/m^2 × 9.81 = 7358 N/m^2 or 7.36 kN/m^2.

plants, shrubs

and grasses

soil substrate

up to 450 mm

Component Weight (kg/m^2 ) Thickness (mm)

vcl 3 3

insulation 3 50

membrane 5 5

drainage layer 3 50

filter 3 3

soil 90 50

turf 40 20

------------- ---------

147 kg/m^2 181 mm

Green Roofs -- Types