Dovetail corrugated sheeting

Dovetail corrugated steel sheeting consists of flat steel sheets, crimped into the form of dovetails, and is usually crimped in three depths, viz., No. I of 3/4in. The maximum size of sheets is 3ft. 9ins. wide, that is, in the direction of the corrugations, and 5ft. 6ins. in length, or across the corrugations. The sheets vary in gauge from 20 to 28. It is only section No. 1 (3/4in. in ,depth) that can be crimped to 20 gauge. M. Noel Ridley