- XPS (50 mm) plus two layers of stone wool;
- stone wool plus bitumen insulation.
High fire resistance of stone wool insulation materials is due to the non-flammability of stone wool produced from basalt fiber capable of withstanding temperatures up to 1500°С.
Some other solutions, for instance PIR-based ones, have demonstrated uncontrolled ignition. At the same time, the materials applied for this purpose had a certificate of compliance with the fire safety class K0, that is, they should not burn, suffer damages caused by high temperatures and pose a fire hazard when damaged.
Rockwool will continue testing the insulation materials this year. Thus, it is planned to conduct tests on the basis of the All-Russian Scientific Research Institute of Fire Defense, which may result in changes in existing normative and technical documents.