Roofing elements
AssigneeMasonite Corporation
InventorAke Thorn
Life of this patent
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Abstract
A roofing element is described which comprises two spaced skins, an upper skin of relatively thick non-metallic sheet material, such as plywood or chip board, and a lower skin of sheet metal, for resisting compression stresses in the upper skin and tension stresses in the lower skin. The skins are bonded to spacing members extending in the lengthwise direction of the element and provided by composite beams of non-metallic or substantially non-metallic material, having webs of wood-based board material and flange members of wood. The spaces between the skins are filled up with a thermally insulating material, such as mineral wool or foamed uretane plastic.
Claims12
A construction element such as a roofing element for great span lengths comprising two substantially flat outer skins wholly spaced apart by distance members interconnecting said skins, said outer skins being of different thickness and of different materials, the upper skin being of a relatively thicker non-metallic material and the lower skin being of a relatively thinner metallic sheet material, for taking up compression stresses in the upper skin and tension stresses in the lower skin, said distance members comprising parallel composite beams of non-metallic material and having relatively wide flange portions and interconnecting relatively thin web portions, said flange portions being bonded directly to said skins by glueing or cementing in combination with nailing.
Dependencies are inferred from the claim text.