Cyclopedia of architecture, carpentry, and building : a general reference work (1912)
American Technical Society · Chicago : American Technical Society · leaf 437
of therafter that will span over one foot ofrun. The length of rafter for a foot of run will also determine the difference in lengths of jacks. For example, if a roof rises 12 inches to one foot of run, the rafter over this span has been found to be 17 inches; this, therefore, is the number of… … Fig. 27. Finding Length of JackRafter in ^-Pitch Roof. 360 THE STEEL SQUARE 10 tongue to 8 on blade, which gives 14^ inches, as shown in Fig. 26.Tins, therefore, will be the number of inches the jacks are to beshortened in a roof rising 8 inches to the foot of run. If the jacks areplaced 24 inches…
Architecture · Building
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