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 ===========+===========================+=========================== | Number of Square Feet of |Number of Shingles Required Exposure to| Roof Covered by 1,000 | for 100 Square Feet Weather | Shingles | of Roof Inches +-------------+-------------+-------------+------------- |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. Red-cedar shingles are graded differently. Their grade depends on their length. Thus, 18-inch, No. 1 shingles are termed “Perfection,” while 18-inch, thin butt are termed “Eureka.” Red-cedar shingles 16 inches long, if made of No. 1, or clear, stock, are designated “Extra * A *.” If they are 16-inch, thin butt, they are termed simply “* A *.” Sawed shingles are made up into bundles of 250, and are sold on a basis of 4 inches width for each shingle. Shingles cost from $4 to $6.75 per thousand, according to material and grade. Dimension shingles—those cut to a uniform width—if of prime cedar, shaved, ½ inch thick at the butt and ¹/₁₆ inch at the top, will cost about $7.75 per thousand, but since such shingles are usually 6 inches wide, less will be required per square.