70 



ABC OF THE STEEL SQUARE 



allow the squaring up of heel as illustrated : 

 and also remember to allow for ridge whenever 

 one is used. 



Oft 



\> 



Fig. 46. 



Fig. 47 illustrates the cut of top of quarter- 

 pitch rafter to lay on top of roof just men- 

 tioned. To apply the square first lay it on 1^ 



Fig. 47. 



and 6, which is quarter-pitch, and gives phimb- 

 cut. From plumb-cut lay off pitch of main 

 roof 10% and 1%, which gives cut. 



