Construction of the Shell 



53 



depress the ceiling furring and crack the plastering, as would be probable if 

 the partition came between the timbers (see "E," Fig. 5). If it be thought, 

 necessary to introduce a fire stop on the partition head (and it is perhaps better 

 so), two beams should be "straddled" 4 inches, with straight bridging between, 

 so that the partition may come in the centre and the interval above be filled with 

 brick and mortar. 



A partition running parallel to the floor timbers and extending through it 

 should have a space of 2 inches on either side between the studding and the 

 floor timbers, so that the finish may be properly nailed (see "A," Fig. 5). This 

 space is straight-bridged and the interval between the floor timbers is filled 

 with brick and mortar. 



A partition unsupported from below should be trussed (see Fig. 5). If it be 

 set across the floor timbers, the sole should set on the rough flooring. If it be set 

 with the floor tim- 

 bers and is light, the 

 floor timbers under 

 it should be three in 

 number, separated 

 to admit 2-inch 

 straight bridging 

 between (see "D," 

 Fig. 5). Ordi- 

 narily two floor 

 timbers straddled 

 5^ inches apart are 

 made to do this 

 work. Three are 

 better, however, as 

 it takes but com- 

 paratively little to 

 sag a floor. If the 

 partition be heavy, 

 as in the case of 

 two stories, four 

 timbers may be 

 used (see "C," 

 Fig- 5)- The two 

 centre ones should 

 be spiked together, 

 forming a sole for 

 the studding, and 



the tWO OUter Ones 

 i i * i i 



straight- b ridged 



and 2 inches from the sole on either side. If the partition be very heavy a 



regular truss partition must be made. 



Partitions, as well as outside walls, should be bridged. This can be done 



House at Bronxville.N.Y., showing a large pitch roof with unusual dormers. Walker & 

 Morris, architects 



