Patent ID: 7647737

Claim:
A building panel formed from a sheet of building material, the building panel comprising: a curved center portion having a curved shape in cross section, the curved center portion including a plurality of stiffening ribs formed in the sheet of building material, the stiffening ribs being oriented longitudinally along a length of the building panel and being positioned within a region of the curved shape, the stiffening ribs protruding in cross section relative to said curved shape; a pair of side portions extending from said curved center portion, the curved central portion being positioned between the side portions; and a pair of complementary wing portions extending from said side portions, each side portion being positioned between the curved central portion and one of the complementary wing portions, the building panel being curved in a longitudinal direction along the length of the building panel without transverse corrugations therein, the curved central portion being concave-shaped in cross section from a perspective between the side portions, each of the side portions being convex-shaped in cross section from a perspective between the side portions, one of the stiffening ribs being positioned halfway between the side portions along the curved shape of the curved center portion.