A Manual of Carpentry and Joinery by J. W. Riley

Author:J. W. Riley
Language: eng
Format: epub
Publisher: The Macmillan company
Published: 1905-03-25T05:00:00+00:00

Fio. 185.—Flan and

obtaining tho Lengths &na u, AB. Lougth and Bevels of

MN. Length of Hi,, KafU-

Q. Bevol fur sldo" out at upper end of Hip Rafter.

D. Hero] for sldo out at luwor Olid of IHp Ilaftar.

E. Bovel f or laoklllK of u]

p Rafter. MH. Leofftb of J&cli Rafters. (Q in tills Illustration corresponds to C in Pigs. 488 and 487.)

248 A MANUAL OF CARPENTRY AND JOINERY.

Fig. 486.—Roof Bevels.

Fig. 487.—Roof Bevels.

AB. Length and Bevels of Common Rafters. MN. Length of Hip Rafter.

C. Bevel for. side cut at upper end of Hip or

Valley Rafter.

D. Bevel for side cut at lower end of Hip or

Valley Rafter.

rafters will vary; they may easily be determined by drawing a cross-section through the roof.

The Lengths and Bevels of Hip and Valley Rafters. — To obtain these, it is first necessary to draw the plan of the building, with the main roof timbers in position. If the inclinations of both sides, and of the end of the roof are the same, and if the end wall is at right angles to the side walls, then the plans of the hip rafters bisect the right angles, and the two hip rafters are of the same length, as shown in the upper part of the plan of Fig. 485. On the other hand, if the end-slope of the roof differs from the side-slopes, the plan of the hip rafter does not bisect the angle. Again, if the end is not at right angles to the side walls, then one of the hip rafters is longer than the other, as shown in Fig. 486.

•ROOF BEVELS. >

24fr

In obtaining the lengths of the hip raftiers it is always best to work from the' centre lities of the upper edges of the hip rafters and ridge piece. The length of the hip rafter is obtained by considering its plan as the base of a right-angled triangle,

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