Ceiling-roof usually without a hatch, made of channel slabs for example. Insulation with granulated glass wool, blown in with special pneumatic units. The ceiling-roof space is ventilated.

Materiale necesare:
1. Folii hidroizolante
2. Saltele din vata minerala de sticla (ELF, LHF, MTF (TWF 1), THERWOO-ROLL, THERWOO-FILC)