E - Fixed Constructions – 04 – D
Patent
E - Fixed Constructions
04
D
20/20.6
E04D 1/00 (2006.01) E04D 3/30 (2006.01)
Patent
CA 1073180
ABSTRACT OF THE DISCLOSURE A corrugated roofing sheet has special elevations formed in the wave crest of the sheet, the elevations being contoured to increase the sheet's rigidity while permitting the elevations to function as a ladder. The elevations provide effective rigidifying while leaving the valleys of the sheet corrugations free for drainage.
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