Sheet metal roof sealing with PUR local foam

The roof was not insulated before foaming. The unhindered effects of heat and cold meant that some of the fastening screws were torn off due to shear forces as a result of the longitudinal expansion of the sheets. Other screws have created elongated holes in the sheets due to the constant expansion. There were countless small leaks.

Spot repairs were not possible here.

PUR Ortschaum offers a safe solution here: the external insulation thermally calms the supporting structure. The excellent insulation value prevents strong heat-cold expansion and thus significantly reduces the load on connections.

Particularly with metal roofs, care must be taken to ensure that the subsurface temperature is high enough, at least 12°C. The reaction heat of the foam removed from the cold sheet metal otherwise prevents optimal foaming.

Roof sealing of sheet metal roofs - light domes and RWA's with PUR local foam

Another weak point in sheet metal roofs are the connections and transitions of the built-in skylights, RWAs, fans, chimneys, etc.

The thermal stresses of the sheets pull on these elements from all sides.

The high insulation value of the PUR in-situ foam also prevents thermal stress here.

The high reactivity of the foam allows the roof openings to be effortlessly integrated into the roof membrane. In practice, it doesn't matter whether the surface to be coated is flat, sloping or vertical. Any roof shape can be optimally insulated and sealed with PUR roof spray foam. Openings are simply foamed and integrated into the roof cladding