At an interior temp of 70F and an outdoor temp of 25F, the roof deck is colder, about 40% of the temperature difference above the outdoor temp, or about 43F. With an outdoor temp of 25F and roof deck temp of ~43F the mean temp through the foam is now about 34F/1C.
The ventilated roof insulation should be a factory-assembled panel consisting of one layer of 7/16 " (11.1 mm) oriented strand board top surface, a built-in ventilation space maintained by 1" (25.4 mm) wood
on the top surface of a roof deck is not acceptable, unless the area between the conduits is filled with an acceptable roof insulation, properly secured, and a full thickness of roof insulation installed over the conduits. H. A clean surface. Before roofing application is started, the
Topdek insulated roof-deck is covered by the Kingspan Ultimate Panel Guarantee, the only guarantee ... Top That. Our sustainability in action ... Topdek insulated roof panels have a Thermal Transmittance (U value) calculated using the method required by the Building Regulations Part L2 ...