226 



inches wide and ^ of an inch deep is frequently used for lining build- 

 ings. Corrugated steel with i}4-i n ch corrugations weighs about 4 per 

 cent more than steel of the same gage with 2*^ -inch corrugations. Cor- 

 rugated sheets are commonly made from flat bessemer steel sheets, by 

 rolling one corrugation at a time. Iron and open hearth steel corrugated 

 sheets can be obtained, but are very hard to get and cost extra. 



The standard sheets of corrugated steel with 2^/2 -inch corrugations, 

 are 28 inches wide before, and 26 inches wide after corrugating, and 

 will cover a width of 24 inches with one corrugation side lap, and ap- 

 proximately 21 }/2 inches with two corrugations side lap, (c) and (a) 

 Fig. 109. Special corrugated steel can usually be obtained that will 

 cover a width of 24 inches with 1^2 corrugations side lap, (b). Cor- 

 rugated steel should be laid with 6 inches end lap on the roof and 4 

 inches end lap on the sides of buildings. 



Corrugated Roof Steel 

 5ide Lap 2 Corrugations 



' -t* - Covers 2/2" --- 



!* 2.1 "- >j [- Z8 "w/'tfe before c&rrug>af/ng 

 r-26" after 



(a) 



Special Cor- Roof Steel 

 Side Lap \2 Corrugations 

 Covers &P**p--C0v&3 24" --- ^ 



}< -30 "w/tfe before corrugaf/ng 

 !*//* " after 

 End Lap for Roof 6" 

 (b) 



Corrugated Siding Steel 

 Side Lap I Corrugation 

 Covers 24 "- ->i* - Covers 4- " - '~^_ 



after 

 End Lap for5/des 4 



(C) 

 FIG. 109. 



