Insulating the roof of the marquee hall is a very important issue due to the requirements for PVC fabric roof sheathing. To date Pol-Plan has used a pumped roof, where the insulation is formed by a layer of air pumped between the PVC membranes. In the insulated tent hall (25x100x6m) with PUR-core composite panel walls realised for Snebo, Pol-Plan used for the first time a new method of roof insulation in the form of a THERMO soffit. This is a multilayer material suspended under the tarpaulin roof, whose 5 mm thick inner thermal insulation layer is made up of polyethylene foam in a polyethylene film lining, coated with a layer of aluminium. Due to the tight adhesion of the 610g tarpaulin-based soffit to the walls and profiles, an insulating air layer is formed between the roof and soffit. Condensing moisture is led outside the hall