Arrangement at buildings assembled of pre-fabricated wall and roof element

Claim 1

An arrangement in buildings assembled of pre-fabricated wall and roof elements, which comprise two imperforate planar metal sheets with insulation therebetween, an open-ended ventilated space provided in the elements on at least one side of the insulation between the latter and the metal sheet, said spaces forming through passageways adapted to communicate with the atmosphere through openings at the ends of the elements, said wall and roof elements meeting in a junction line, an angular beam provided along the junction line between wall and roof elements on at least two opposed sides of the building to provide a common suction chamber into which the ventilated spaces of both the wall and the roof elements open, said angular beam being so arranged that a horizontal gap opening communicating with the atmosphere is formed between one leg of the beam and the outer surface of the wall elements, said building including a perforated metal sheet bent into U-section shape to support said wall elements and form a connecting channel for the lower open ends of the ventilated spaces in said wall elements, the perforation in said U-shaped sheet providing direct access from said channel to the atmosphere, whereby wind forces along the planar outer surfaces of said wall elements induce a suction in said suction chamber to cause air flow inwardly through said perforated U-shaped sheet and through said ventilated spaces, and roofing felt covering the roof elements and laid below the angular beam so as to form a curved guide surface bridging the corner of the beam to improve the induction of flow through said roof elements.