WOODEN FLOOBS AND CEILINGS 



71 



1 inch thick, though 1£ inches is preferable to allow liberally for wear 

 on the floor. 



The joists are supported at each end on a 4^" by 3" wall-plate, built 

 into the side walls, the joists themselves having their ends built in for 

 a distance of 4£ inches. The joists are supported at intermediate points 

 by 9" by 6" beams, such as B, which are placed so that the free span 

 of the joists does not exceed 8 feet. Thus a building 16 feet wide 

 inside would have one beam such as B, running, in mid-width, along 

 the length of the building; while a building 24 feet wide would have 



-<7i "ST vfacLPL //re 



Fig. 73. 



two such beams. The ends of these beams rest on 6" by 6" by 14" 

 concrete blocks built into the end walls, the ends of the beams them- 

 selves being built in for a distance of 6 inches. The beams are sup- 

 ported, at intervals of not more than 8 feet, by 6" by 6" posts P. 

 Should it not be convenient or practicable to put in these beams in 

 one length, the different lengths should be jointed together as shown 

 in Fig. 76, any such joint being situated near one of the pillars P. 

 The bases of the posts, or pillars P, should be firmly bedded in, and 

 supported by, concrete footings. These footings will, in the majority 

 of cases, form part of a concrete floor. 



