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

Table 4

Thermal transmittance coefficient—conventional flat roof (the table is structured by authors upon data from cost estimate and [41]).

Internal surface resistance to heat transfer	External surface resistance to heat transfer	Sum of the resistance of all layers	Total resistance to heat transfer through the bulkhead	Thermal transmittance coefficient
Rsi (m^2K/W)	Rse (m^2K/W)	Rn (m^2K/W)	RT (m^2K/W)	U (W/(m^2K))
0.1	0.04	4.44	4.58	0.22