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This type of roof guarantees the best value for money. It is mainly used for logistics buildings, where its low weight means large meshes can be built without the need for pillars. The soffit of this roof can be finished with an insulating false ceiling made of light plaques. This roofing system built by Hormipresa is based on double T-beams supporting tubular purlins. The main beams are placed on and attached to pillars.
A metal sheet, normally made of steel or aluminium, with galvanised or lacquer finish, is normally placed between each of the tubular purlins, which are laid out with different spaces between axes. A sheet metal and polyurethane sandwich panel can also be used; insulation in the roof is also provided by a sandwich of two metal sheets and high-density rock wool between them. The sky lights are normally made of polycarbonate with an air chamber.