STEEL FRAME BUILDING WITH PLASTER WALLS. 



53 



To prevent the condensation of moisture on the inside of the steel roof and the resulting 

 dripping, anti-condensation lining was used, as is shown in Fig. 44. This lining was constructed as 

 follows: ( i.ilv.ini/xl wire poultry netting was fastened to one eave purlin, was passed over the ridge, 

 stivti'hed tight and fastened to the other eave purlin. The edges of the wire were woven together 

 1>\ inrans of wire clips. On the wire netting was laid two layers of asbestos paper rV in. thick, 

 and on top of the asbestos was laid two layers of tar paper. The corrugated steel was then laid on 

 top of the roof in the usual way and was fastened to the purlins by means of long soft iron wire 

 n.iiU spaced as shown in Fig. 44. To prevent the lining from sagging stove bolts A in. in diam- 

 i ti-r with I in. X J in. X 4 in. flat washers on the lower side were placed between the purlins. 

 The author would recommend that the purlins be spaced not to exceed 2 ft. 6 in. and the stove 

 bolts omitted. 



. ~"r 



ZT Concrete * 



Expanded 

 Metal 



IV Plaster-' 



Expanded.' 

 Metal ' 



5tone I8"i8"iz m 

 Brick 

 Concrele 



k -37 r e" i .--- 



FIG. 45. STEEL FRAME BUILDING WITH PLASTER WALLS. 



Steel Frame Building with Plaster Walls. The steel frame building shown in Fig. 45 was 

 svered with expanded metal and plaster walls and roof constructed as follows: The side walls 

 ere made by fastening f in. channels at 12 in. centers to the steel framework and then covering 

 lis framework with expanded metal wired on. The expanded metal was then covered on the 

 Jtside with a coating of cement mortar composed of one part Portland cement and two parts 

 ind, and on the inside with a gypsum plaster, making the walls about 2 in. thick. The roof con- 

 sists of a 2\ in. concrete slab reinforced with expanded metal, this slab being covered with 10 in. X 

 12 in. slate nailed directly to the concrete. 



Steam Engineering Building. Details of a transverse bent of the steam engineering building 

 at the Brooklyn Navy Yard are given in Fig. 46. 



The main columns are spaced 48 ft. centers while the main trusses are spaced 16 ft. centers. 

 The intermediate trusses are carried on heavy trusses rigidly fastened to the main columns. The 

 crane girders are carried on crane columns that arc fastened to the main columns by light lacing. 

 This method of supporting heavy crane girders is the most satisfactory method yet proposed. 

 The building is well lighted with glass in the side walls, and sky lights in the roof. More than 60 

 per cent of the area of the external walls and roof is glazed. Many other interesting details can 

 be obtained from the drawings. 



