This section is from the book "Notes On Building Construction", by Henry Fidler. Also available from Amazon: Notes on building construction.
Plates V. to XII. are reduced copies of part of the contract drawings for some roofs recently constructed.
There is no object in describing them in detail, but it should be mentioned that Plates XI. and XII. are inserted by the kind permission of Sir Alexander Rendel, K.C.I.E., and the remaining plates by that of Messrs. Handyside and Co.
The student will derive more benefit by carefully studying these practical drawings of well-designed roofs than from representations of roofs drawn merely to illustrate the text.
Fig. 308.
Rise, H = 3/5. Rise of Tie Rod, t = 3/45. Principals 6 feet 8 inches apart.
Span, s. | Rafter, PR. | Struts, S. | Queen Bolt. | Tie Rod. | ||||
In feet | T iron. | a. | 6. | c. | d. | e. | f. | |
Inches. | Inches. | |||||||
20 | 2½x2 x3/8 | 2 x2 x3/8 | ¾ | 3/8 | .. | 5/8 | ¾ | |
25 | 2¾x2½x3/8 | 2 x2 x3/8 | 7/8 | ¾ | 5/8 | 7/8 | 1 | |
30 | 2¾x2½x½ | 2½x2½x3/8 | 1 | ¾ | 5/8 | 1 | 1 1/8 | |
35 | 3x2¾x½ | 2½x2½x3/8 | 1 | ¾ | ¾ | 1 | 1 1/8 | 1¼ |
40 | 3½x3x½ | 2½x2½x5/8 | 1 1/8 | 7/8 | ¾ | 1 1/8 | 1¼ | 1 3/8 |
45 | 4 x3½x½ | 3 x3 x½ | 1¼ | 1 | 7/8 | 1 1/8 | 1¼ | 1 3/8 |
50 | 4 x3½ + 5/8 | 3 x3x5/8 | 1¾ | 1 | 7/8 | 1¼ | 1 3/8 | 1½ |
55 | 5 x4½x5/8 | 4 x4x½ | 1 3/8 | 1 1/8 | 1 | 1 3/8 | 1½ | 1 5/8 |
60 | 5 x4½x¾ | 4 x 4 x 5/8 | 1 3/8 | 1 1/8 | 1 | 1½ | 1 5/8 | 1¾ |
1 Maynard.
2 From Molesworth's Pocket Book.
 
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