TECHNOLOGY FOCUS - INSTRUMENTATION AND TESTING - Preferred Components: The spacers are regularly distributed within the interior space and/or the spacers within the interior space are arranged in checkered-, grid-, or matrix form. The spacers are arranged within the interior space in length and/or width degrees of spherical or conical shaped inflatable roof, where the area of the pole or the cone tip is free of spacers. The spacers are on the protective film and/or on the biogas film, and/or the spacers are on a particular flat distance holder supporting structure or spacer film between the protective film and the biogas film. The spacer structure or spacer film is connected with the protective film and/or the biogas film, in the edge region, and/or the spacers are connected to the film directly or indirectly, non-positively, positively and/or cohesively and/or the spacers are integrally formed from the material of the film. The spacers are glued, welded, vulcanized, or sewn to the sheets, or bonded, or integrally formed from the material of the film holding pockets. The holding pockets and/or spacers are spherical, partially spherical, strip, tubular or completely cylindrical and/or the holding pockets are formed tubular and receive the profile-type spacers. The spacers have a height of 1-20 cm, preferably 5-15 cm. At least one, preferably a number of pairs of strip-shaped spacers are provided which substantially extend from the lower edge of the films in the region of the pole and form pair of air channels, where a ring encircling annular air duct is provided at the bottom of the slides, which is positively connected to the pair of air channels, and the spacer is arranged in the edge region of the film. An arrangement of the spacers in the area of the connecting piece and/or an arrangement of the connecting piece in the area of the annular air passage, or air channel pair are performed, where the spacer and/or the holding pockets are thermally insulated and/or isolated. The inflatable roof is cone-or dome-shaped.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The spacers are made of foamed plastic. The film, holding pockets and/or the spacers are made of glass fiber reinforced plastic, carbon fiber reinforced plastic, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyurethane, polyethylene terephthalate, polytertafluoroethylene and/or polymethyl methacrylate.