ST Conventional roof – standard product with thermal insulation
defined in Table 3; the external layer has solar
reflectance 0.25, typical for most construction materials,
and thermal emittance 0.9.CR White cool roof – same layers of the previous roof finished
with an elastomeric white coating having solar
reflectance 0.8 and thermal emittance 0.9.
CR low-e Metallic reflective coating – as above with a metallic layer
with solar reflectance 0.65 and thermal emittance 0.4.
GR Green roof, whose main properties are summarised in
Table 5. The structure of the green roof is more complex.
The adopted solution is defined according to typical values
of the green roof design in Mediterranean area. It is
important reminding that the green roof model implemented
in Energy Plus, is mono-dimensional add based
on several assumptions. To be noted that the roof insulation
thickness is lower than conventional roof insulation,
to take into account the insulation effect of the green roof.
It is also noted that, according to typical green roof systems,
the green area correspond to 80% of the total roof
surface, the remaining is surface dedicated to footpaths,
here assumed to be made of concrete.