264 



SIDE; WALLS AND CONCRETE BUILDINGS 



erection. The trusses are spaced from 14 to 18 feet and carry 6, 7 and 

 8-inch channel purlins. The purlins are spaced from 6 to 7 feet apart 

 and carry roof slabs 2^ to 3 inches thick made of expanded metal and 

 concrete. The expanded metal is made from No. 16 B. W. G. steel 

 plate with 4-inch mesh, and the concrete is composed of I part Port- 

 land cement, 2 parts sand and 4 parts screened furnace cinders. The 

 roof slabs are covered with 10 x 1 2-inch slate nailed directly to the 



Slate 



Concrete- 

 Expanded 

 Metaf 



Pitch =i 



Plaster-' 



Expanded 

 Metal " 



f Plaster 

 Expanded 

 "Metal 



'Plaster 

 Expanded 

 " Metql 



^Channel 

 " Iron 



-Plaster 

 Channel 

 , Iron Stud 

 L d"l Beam 

 ^ELxp-Metal 



Section 



through 



Head 



Plan 



of 

 Window Box 



Plan 



at 

 Column 



Stone I8x|8*ia" 

 Brick 

 Concrete 



Grade-' 



k 37' 6 



FIG. 131. CROSS-SECTION OF STEEL BUILDING COVERED WITH EXPANDED 



METAL AND PLASTER. 



concrete, and are plastered smooth on the under side. The side walls 

 were made by fastening 24 -inch channels at 1 2-inch centers to the steel 

 framing, and covering this framework with expanded metal wired on. 

 The expanded metal was then covered on the outside with a coating of 

 cement mortar composed of I part Portland cement and 2 parts sand 

 and on the inside with a gypsum plaster, making a wall about 2 inches 

 thick. The ground floors were made by covering the surface with a 

 6-inch layer of cinders in which were imbedded 2 x 4-in. white pine nail- 



