iS6 



FRAMEWORK 



Example of Ketchum's Modified Saw Tooth Roof. The modified 

 form of saw tooth roof described above was proposed by the author 

 in the first edition (1903). This form of saw tooth roof has recently 

 (1905) been used in the paint shops of the Plank Road Shops of. the 

 Public Service Corporation of New Jersey, Newark, N. J. The build- 

 ing proper is 135 feet wide by 354 feet long. The main trusses are of 

 the modified saw tooth type with 44-ft. spans and a rise of %, and are 

 spaced 16 ft. centers. The general details of one of the main trusses 

 are shown in Fig. 843. 



The building has an independent steel framing with brick curtain 

 walls on the exterior. Pilasters 24 in. by 20 in. are placed 16 feet apart 

 under the ends of the trusses, the intermediate curtain walls being 

 12 inches thick. 



The roof is a 5-ply slag roof laid on 2-in. tongued and grooved 

 spruce sheathing, which is spiked to 2 in. X 5 in. spiking strips, which 

 are bolted to 8-in. channel purlins spaced 6 feet centers. The slag 

 roofing is laid to comply with standard specifications as described in 

 Part IV. 



I J* I'-Z Portland Cement Finish. 



*/''/. Finished Floor Level ,.-4, 1:3:5 fbrtland Cement Concrete \ 



FIG. 84a. MODIFIED SAW TOOTH ROOF, PAINT SHOP, PUBLIC SERVICE 



CORPORATION. 



