. Cyclopedia of architecture, carpentry, and building; a general reference work ... Fig. 203. Simpler Method ofAvoiding Projecting Hip Rafter 152 CARPENTRY 141 cut at C. The length of the rafter can be found by using proportionor by finding the length oi B D. In using proportion, it is evident that B E, the run of the shortvalley, is to Ci^ as 7 feet 6 inches, or 90 inches, is to 13 feet 4 inches,or 160 inches. 5£;:287::90:160287X90 BE= 160 = inches=13 feet 5h inches The rise is 7 feet 6 inches and the run is 13 feet 5| inches. Another way in which the problem may be solved, is to findwh
. Cyclopedia of architecture, carpentry, and building; a general reference work ... Fig. 203. Simpler Method ofAvoiding Projecting Hip Rafter 152 CARPENTRY 141 cut at C. The length of the rafter can be found by using proportionor by finding the length oi B D. In using proportion, it is evident that B E, the run of the shortvalley, is to Ci^ as 7 feet 6 inches, or 90 inches, is to 13 feet 4 inches,or 160 inches. 5£;:287::90:160287X90 BE= 160 = inches=13 feet 5h inches The rise is 7 feet 6 inches and the run is 13 feet 5| inches. Another way in which the problem may be solved, is to findwhere the ridge of the ell intersects the main roof surface. The inter-section is at a height of 7 feet 6 inches which is tW of the run of. Fig. 204. Method of Using Clapboard to Cut Bevel on Rafter A C, or ® of 16 feet and the distance B D is just 9 feet. Hence, therun of 5 E is Vl¥+9= 13 feet 5| inches, and this is -A ofthe run of the rafter C F. Hence, the run oiCFis V = 23 feet11 inches. The end cut at B on B E, that is, the bevel that fits against CF,to be cut accurately, must be handled like the side bevel at F. Firstcut the bevel at the plate and get the backing line that makes B Ehe in the main roof surface. Now, at B, either back the rafter ashort distance, or use a clapboard as in Fig. 204. Jack Rafters. Fig. 205 shows the plan of the roof in whichthere are, in addition to hip and valley rafters, sets of jack B and B D are hip rafters, C ^ is a valley rafter, and the otherrafters are common and jack rafters. At B E and E H are shown 153 142 CARPENTRY the ridge boards. Of the jack rafters there are three different kinds:those Uke IJ which run from the valley rafter ridge board;tho
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