BUILDING CONSTRUCTION 



307 



of either 1 or i}4 corrugations. The end lap may be from 

 1 to 6 inches. 



Tin. Tin is a thin steel plate coated with a covering of 

 tin. The size of stock sheets ranges from 20 inches by 

 38 inches in gauges 30 to 26^. It is sold by the box. 



IvA** 



Fig. 249. Typical frame construction 



