ROOFING Russian patent published in 1995 - IPC

FIELD: civil engineering. SUBSTANCE: roofing has upper and lower fibrous cement layers combined by ribs with formation of closed spaces. Roofing is made of separate Z-shaped members, each having flanges combined by a rib bent in such a manner that vertical straight line would pass through the center of rib gravity and point of conjugation of the rib with flanges. The flange has a camber at a distance of at least 100 mm from the point of conjugation of the rib and flange, with a height equal to the member thickness, and the members are placed one after another in such a manner that their end sections are placed in the concave part of the flanges of the adjacent members forming thereby the upper and lower layers. EFFECT: improved design. 2 dwg