No matter how tear-resistant and elongation-resistant the material is during installation, the deterioration of key waterproofing properties can occur within just a few weeks under the sun. That is why all Roofer membranes are additionally protected with a UV stabilizer, which allows them to retain their physical and mechanical properties when exposed to sunlight for up to two months. Resistance to UV radiation plays a particularly important role when roofing films are continuously exposed to the sun during installation. And a parameter such as resistance to temperature fluctuations becomes relevant during the material's operation. The membrane's resistance to UV radiation is crucial during installation, as under-roof films are continuously exposed to it. Under-roof films can be damaged by excessive sunlight. Most multilayer insulation materials are made of polypropylene (PP), which is inherently sensitive to ultraviolet radiation. Theoretically, most polymeric materials used in under-roof films can withstand temperatures ranging approximately from -40 ° C to + 90 ° C. That is why Roofer membranes use polypropylene, which can withstand up to 120 ° C. This indicator means that under-roof membranes will not lose their properties during short-term exposure to such high temperatures.
