. Cyclopedia of architecture, carpentry, and building : a general reference work .... 362 SHEET METAL WORK 1S3 more pleasing appearance, but the larger corrugations are stiffer andwill span a greater distance,thereby permitting the purlins to be Fig. thickness of the metal gene-ally used for roofing and sidingvaries from No. 24 to No. 16 gauge. By actual trial made by The

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