Author: Owen Bernard Maginnis

Publisher: Rarebooksclub.com

Published: 2013-09

Total Pages: 42

ISBN-13: 9781230112527

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1914 edition. Excerpt: ...extended in O. On LK lay off the jack rafters as QP, SR, etc.; equally spaced and square to the wall plate. The exact lengths of the jacks will be to the line OK, and their side level will be as at P. The bottom notch will, of course, be as at A or D, Fig. 83; K shows the bottom notch for the hip rafters and N the peak cut. The first roof which I produce is one of the hip and valley class, on a rectangular main building with an L or addition. ABCFDE, Fig. 85, is the plan of the building and the outside line of the wall plates. The roof is of half pitch or square pitch, as some mechanics call it, which means the height of the roof is equal to half the width of the house. The house has two gables, one on each end of the main part with a hip on the L, and the intersection of the L roof with the main roof produces two valleys. EID is the plan of the hip, and EID, Fig. 86, is the elevation of it, where the general view of the constructed roof is shown. QJ and JF are the valleys on the plan. In framing this roof, the simplest way is as follows: To obtain lengths and bevels of the common rafter, produce the ridge line GH, a distance equal to half the width of the house which 15 Elevation of Roof Shown in Fig. 85. is the height of the pitch, to L and K. Join AK and KQ; also BL and LC. AK will be the neat length of the common rafter, if no ridge board is inserted, but if there be a ridge board, half its thickness must be sawn off the length on the bevel for the cut on the plate. Any ordinary mind will see the simplicity of this method. For the hip rafters, which will stand over the seats EI, and DI, produce the line DI and set off on it the height of the pitch, IM, equal to KG. Join ME. ME will be the exact length of the hip rafter required, and...