244 CORRUGATED STEEL. 



than 30 pounds per square foot. A less substantial roof will not usually 

 be satisfactory. 



An engine house with anti-condensation lining on the roof and 

 sides has been in use in the Lake Superior copper country for several 

 years, and has been altogether satisfactory under trying conditions. 

 The covering and lining of roof and sides are fastened by clinch nails 

 to angle purlins and girts spaced about two feet apart. 



A transformer building designed by the author and built by the 

 Gillette-Herzog Mfg. Co., at East Helena, Montana, has anti-condensa- 

 tion lining on the roof as shown in Fig. 129, and is lined on the sides 

 with one layer of asbestos paper, and I 1 /\. -inch No. 26 corrugated steel. 

 The black framework, the red side lining, and white roof lining made a 

 very pleasing interior. This building after several years is giving en- 

 tire satisfaction. 



Corrugated Steel Plans. The shop plans, list of steel and details 

 of the corrugated steel for a mill building are shown in Fig. 128 and 

 Fig. 129 (for the general plans and a detailed estimate of this build- 

 ing see Chapter XXVIII). Corrugated steel sheets should be ordered 

 to cover three purlins or girts if possible. Bevel sheets should be ordered 

 by number, and sheets should be split and reentrant cuts should be made 

 in the field. All sheets should be plainly marked with the number or 

 length. Sheets No. 22 or lighter can be bent in the field, heavier metal 

 should always be bent at the mill. In preliminary estimates of corrug- 

 ated steel allow 25 per cent for laps where two corrugations side lap 

 and 6 inches end lap are required, and 15 per cent for laps where one 

 corrugation side lap and 4 inches end lap are required. 



Cost of Corrugated Steel. Galvanized steel in 1903 is quoted at 

 about 75 per cent off the standard list, f . o. b. Pittsburg ; list price of flat 

 galvanized steel being as follows: 



No. 10 to 1 6 inclusive I2c. per Ib. 



No. 17 to 21 inclusive I3C. " " 



No. 23 to 24 inclusive I4C. " " 



No. 25 to 26 inclusive I5c. " " 



No. 27 i6c. " " 



