Fig. 5
An allowance should always be made for waste in estimating the number of shingles required.
[Table X] is arranged for shingles from 15 to 27 inches in length, 4 and 6 inches in width, and for various lengths of exposure.
57. Shingles are classed as shaved, or breasted, and sawed shingles.
Shaved shingles have fallen almost into disuse, owing to the difficulty of manufacturing them. These shingles vary from 18 to 30 inches in length, and are about ½ inch thick at the butt and ¹/₁₆ inch at the top.
Sawed shingles are usually from 14 to 18 inches long and of various thicknesses. In the case of 18-inch shingles, five shingles, at their butts, will make 2¼ inches; that is, the thickness of one shingle at the butt is 2¼ ÷ 5 = .45, or about ⁷/₁₆ inch. At the top, each shingle is ¹/₁₆ inch thick. With 16-inch shingles, however, five of them make only 2 inches. Therefore, the thickness of a 16-inch shingle at the butt is 2 ÷ 5 = .4, or about ⅜, inch.
TABLE X
DATA FOR ESTIMATING SHINGLES
| Exposure to Weather Inches | Number of Square Feet of Roof Covered by 1,000 Shingles | Number of Shingles Required for 100 Square Feet of Roof | ||
|---|---|---|---|---|
| 4 Inches Wide | 6 Inches Wide | 4 Inches Wide | 6 Inches Wide | |
| 4 | 111 | 167 | 900 | 600 |
| 5 | 139 | 208 | 720 | 480 |
| 6 | 167 | 250 | 600 | 400 |
| 7 | 194 | 291 | 514 | 343 |
| 8 | 222 | 333 | 450 | 300 |
White-pine and white-cedar shingles are graded alike. The shingles made of No. 1, or clear, stock are designated XXXX. Those made of No. 2 stock, with 6-inch clear butt, are given the brand XX, while those made of mill cull, with sound butt, are called X.