To solve the problem that outside heat insulation having a high heat insulation efficiency is employed in both a roof using a folded plate roofing and a tight frame for the folded plate roofing but ventilation is not taken into consideration at all, when a roofing board is set on a skeleton, work performance is not good and a worker has a high risk of accidentally falling down to the ground because the worker has to extend the hands to the back side of the roof board with taking a posture of facing downward and mechanical strength is weak because the roof boards are only fitted to the tight frame.
A thermal insulating material 6 is laid so that there is no space in the upper surface of the flat roof, a leg-like rib section having a roof board lower surface supporting edge is formed in one end section thereon, at the same time, a leg-like rib section fitting folded edge or a roof board lower surface supporting edge lapping edge is formed in the other end section, the folded edge is fitted to the leg-like rib section, or the roofing A lapping the roof board lower surface supporting edge lapping edge on the roof board lower surface supporting edge is laid, and the flat outside thermal insulation ventilation roof connected so as to provide a corner section ventilation section E every proper length so that the construction of the roofing A can be at right angles to a space between the leg-like rib sections.
YAMADA NOBUAKI
KAMASHIKA TOMOKAZU
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