Theoretical Analysis and Comparison of the Thermal Performance, Construction Costs, and Maintenance Complexity between a Conventional and an Intensive Green Roof

Table 1

Conventional flat and intensive green roof layers (placed on a load bearing structure) characteristics and thickness (the table is structured by authors upon data collected from cost estimate for the building under construction).

Conventional flat roof				Intensive green roof
Layer		Thickness (m)	Material	Layer		Thickness (m)	Material
VI	Ceramic tiles	0.02	Ceramic tiles placed on standard pads	VIb	Vegetation		Shrubs
				VIa	Growing medium	0.4	Substrate
V	Filter layer	0.003	Geotextile	V	Filter layer	0.005	Geotextile filter layer SF 100 g/m²
			ƍ = 500 g/m²	IVb	Drainage-accumulation	0.06	Accumulation cups filled with a dedicated mix
				IVa	Root protection	0.0025	Filter layer (with protection from roots)
IV	Waterproofing	0.002	ECB-based polymeric waterproofing tape	IV	Waterproofing	0.002	ECB-based polymeric waterproofing tape
III	Thermal insulation	0.18	Foam glass in hot bitumen	III	Thermal insulation	0.18	Foam glass in hot bitumen
II	Vapour barrier	0.01	Synthetic felt geotextile	II	Vapour barrier	0.01	Synthetic felt geotextile
I	Lightweight concrete	0.13	Upper surface area incline of 2%, exposure class XC2, concrete class C30/37, with a reinforced mesh B 500 B, Q-28	I	Lightweight concrete	0.13	Upper surface area incline of 2%, exposure class XC2, concrete class C30/37, with a reinforced mesh B 500 B, Q-28
	Load bearing structure	0.30	Reinforced concrete		Load bearing structure	0.30	Reinforced concrete