Exterior roof insulation
After the roofing material has been removed, we can immediately spray the polyurethane thermal insulation and waterproofing. There is no need to dismantle the rafters, as the insulation process can even be done in stages – one rafter at a time. There is no need to raise any rafter, as it is enough to fill the rafter spaces because the thermal insulative qualities of the polyurethane foam are more than double those of normal insulation materials. As the polyurethane foam is not only thermal insulating, but also waterproofing, no extra roof protective sheeting is necessary. There is also no need to worry about interior dismantling, as all insulation work is done from the outside.
The closed cell insulation foam’s weight load is insignificant, as its 5 cm thick layer (equivalent to 10-11 cm thick mineral wool) is only 3 kg / m2. The polyurethane insulation fills in all the little tiny niches and fills all cracks, adhering to every curve, nook and cranny over the entire roof surface, and therefore forms a single large, expanding surface. This is yet another advantage over tabular insulation materials. Accordingly,the formation of heat bridges and the passage of aier ispractically zero.
The density of the closed cell polyurethane foam is 35kg/m3, compressive strength 150KPa
Thermal conductivity coefficient: 0,023W/mK
Fire classification: B2 - SELF-EXTINGUISHING
Warranty of closed cell polyurethane foam sprayed: 10 years