SPECIFICATIONS 



399 



mum gage of corrugated steel shall be No. 22 for roofs, No. 

 24 for sides and No. 26 for lining. 



The gage of corrugated steel in U. S. Standard Gage, and 

 weight per square foot shall be shown on the general plan. 



44. The span, or center to center distance of purlins, shall 

 not exceed the distance given in Fig. 3 for a safe load of 30 

 pounds per square foot. Corrugated steel sheets shall prefer- 

 ably span two purlin spaces. 



5 = working Stress =l5ooo IbS. 

 depth of corrucjaTion-ins. 



h 



b = width of Sheet in inches 

 t = thickness of sheet in inches 

 1 = clear span, in inches 



FlG 3. SAFE UNIFORM LOAD IN POUNDS FOR CORRUGATED STEEL 

 FOR DIFFERENT SPANS IN FEET. 



45. Corrugated steel shall be laid with two corrugations 

 side lap and six inches end lap when used for roofing, and one 

 corrugation side lap and four inches end lap when used for 

 siding. 



46. Corrugated steel shall be fastened to the purlins by 

 means of galvanized iron straps ^4 inches wide by No. 18 gage, 

 spaced 8 to 12 inches apart ; by clinch nails spaced 8 to 12 inches 

 apart; or by nailing directly to spiking strips with 8d barbed 

 nails, spaced 8 inches apart. Spiking strips shall preferably 

 be used with anti-condensation lining. Bolts, nails and rivets 

 shall always pass through the top of corrugations. Side laps 

 shall be riveted with copper or galvanized iron rivets 8 to 12 

 inches apart on the roof and i l / 2 to 2 feet apart on the sides. 



47. Corrugated steel lining on the sides shall be laid 

 with one corrugation side lap and four inches end lap. Girts 

 for corrugated steel lining shall be spaced for a safe load of 

 25 pounds per square foot as given in Fig. 3. 



Spacing Purlins. 



End and Side Laos. 



Fastening. 



Corrugated Steal 

 Lining-. 



