The flat roofs made with steel corrugated sheets on steel structure, with isolation from the above and bituminous waterproofing, arranged according to the construction method called “warm roof”, and self-protected by thin embossed sheet of aluminium embedded over the bituminous sheath, are one of the most common construction types, the subject of theorizing in popular manuals, aimed at defining the "compliant solutions" and the "rules of the art". In the proposed case of study, a cover of this type, made on a plant of 7,500 sq. m, which are held in machining of high precision electronic components, in a few years has been the subject of twice total renovations, both consisted of adding one additional layer of waterproofing bituminous self-protected sheet, to end the drip of water inside, which continued to be present in winter, despite the work already done and redone. And there was going to run the third work of the same type, until the writer has identified the cause of the dripping water in absence of a continuous vapour barrier below the insulation. A work of complete restructuring of the construction’s cover has been then proposed and implemented, without modifying the existing roof, and allowing that the industrial production would remain in operation without any interruption: the waterproofing has been used as vapour barrier of new layers of insulation; higher slopes have been made, very useful for large spans of the deformable cover; a new waterproofing and new insulation layer have been put in place as an "inverted roof", protected from the weather and the sun and drained, for cope with the tropical downpours which have now become common even in the city of Potenza. Interventions on the existing skylights, and a floor that provides ventilation, give the coverage characteristics of a "passive house" and his cheap annual expense, and ensure the durability of waterproofing.

Thermo-hygrometric and physical-mechanical pathologies of the steel flat roofs: the case of a large industrial plant in Tito (Potenza, Italy)

LEMBO, Filiberto
2013-01-01

Abstract

The flat roofs made with steel corrugated sheets on steel structure, with isolation from the above and bituminous waterproofing, arranged according to the construction method called “warm roof”, and self-protected by thin embossed sheet of aluminium embedded over the bituminous sheath, are one of the most common construction types, the subject of theorizing in popular manuals, aimed at defining the "compliant solutions" and the "rules of the art". In the proposed case of study, a cover of this type, made on a plant of 7,500 sq. m, which are held in machining of high precision electronic components, in a few years has been the subject of twice total renovations, both consisted of adding one additional layer of waterproofing bituminous self-protected sheet, to end the drip of water inside, which continued to be present in winter, despite the work already done and redone. And there was going to run the third work of the same type, until the writer has identified the cause of the dripping water in absence of a continuous vapour barrier below the insulation. A work of complete restructuring of the construction’s cover has been then proposed and implemented, without modifying the existing roof, and allowing that the industrial production would remain in operation without any interruption: the waterproofing has been used as vapour barrier of new layers of insulation; higher slopes have been made, very useful for large spans of the deformable cover; a new waterproofing and new insulation layer have been put in place as an "inverted roof", protected from the weather and the sun and drained, for cope with the tropical downpours which have now become common even in the city of Potenza. Interventions on the existing skylights, and a floor that provides ventilation, give the coverage characteristics of a "passive house" and his cheap annual expense, and ensure the durability of waterproofing.
2013
9780987554208
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/61637
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