ABC OF THE STEEL SQUARE 1 



The seventh line of figures gives the cuts of 

 sheathing and shingles in valley or hip, for 

 example : 



1. If your roof is raised 8 inches to the foot, 

 or, as it is called, third pitch, under 8 on the first 

 line are the figures 14.42. This is the length of 

 common rafters for one foot run. If the building 

 is 16 feet wide half the width of building would 

 be the run of common rafter. In this case it 

 would be 8; multiply 14.42 by 8, you have 

 115.36 inches, or 9 feet 7% inches. 



8. To obtain the bottom and top cuts of 

 common rafter use the figures 12 on body and 8 

 OK tongue ; 12 side gives bottom cut, 8 side gives 

 top cut; the same figures give bottom and top 

 cuts for jack. 



On the second line under 8 are the figures 

 18.78; multiply these figures by 8, which is the 

 run of the common rafter. This gives 150.24, or 

 12 feet 6y inches. This is the correct length 

 of hip or valley rafter. To obtain the bottom 

 and top cuts for hip or valley rafters, use the 

 figures 17 on body and 8 on tongue; 17 side 

 gives bottom cut, 8 side gives top cut. 



This is all the figuring necessary to be done. 

 The reason for giving the lengths for one fox>t 

 of common and hip or valley rafters is that it 



