Ondal is a prefabricated building system made up of pillars, H-, I- and inverted T-beams, roofing elements with constant heart-to-heart distance (5 m) alternating with connecting units in vibrated reinforced concrete and heads. This system is mainly used for the realization of roofings for industrial and commercial buildings.

The Ondal system is realized by manufacturing V-section roofing elements ( with or without closed heads), connecting units (with smooth lower surface, blind bends, flat or provided with holes to insert northlights or flat skylights) and variable-section connecting elements between the covering elements.

The particular structure of this system allows, even when the building is being built, to create partitions parallel to the beams, to place the gutters outside the roofing, to obtain summer roof ventilation, to set the valleys at least 50 cm below the skylights and, in case of sawtooth roof, to optimize the PV systems.

Low structural weights, high static performance and fire resistance result in a reduction of loads on the foundations, maximum exploitation of cubic volumes and less frequent interventions to conform to the increasingly demanding regulations.

Moreover, the Ondal system provides for the use of inverted T-beams for accommodating the overhead crane rails or raised beams for space-saving purposes.

D.L.C. Milano international patent