Figure 3-25.-Nails suitable for installing strip shingles,recommended nail lengths, and nail placement.are laying self-sealing strip shingles in windy areas, thestarter strip is often formed by cutting off the tabs of theshingles being used. These units are then nailed in place,right side up, and provide adhesive under the tabs of thefirst course.Nails used to apply asphalt roofing must have alarge head (3/8- to 7/16-inch diameter) and a sharp point.Figure 3-25 shows standard nail designs (view A) andrecommended lengths (view B) for nominal 1-inchsheathing. Most manufacturers recommend 12-gaugegalvanized steel nails with barbed shanks. Aluminumnails are also used. The length should be sufficient topenetrate the full thickness of the sheathing or 3/4 inchinto the wood.The number of nails and correct placement are bothvital factors in proper application of rooting material.For three-tab square-butt shingles, use a minimum offour nails per strip (fig. 3-25, view C). Specificationsmay require six nails per shingle (view C). Align eachshingle carefully and start the nailing from the end nextto the one previously laid. Proceed across the shingle.This will prevent buckling. Drive nails straight so thatthe edge of the head will not cut into the shingle. Thenail head should be driven flush, not sunk into thesurface. If, for some reason, the nail fails to hit solidsheathing, drive another nail in a slightly differentlocation.WOOD SHINGLES AND SHAKES.— Woodshingles are available in three standard lengths: 16, 18,and 24 inches. The 16-inch length is the most popular.It has five-butt thicknesses per 2 inches of width whenit is green (designated a 5/2). These shingles are packedin bundles. Four bundles will cover 100 square feet ofwall or roof with 5-inch exposure. The 18- or24-inch-long shingles have thicker butts-five in 2 1/4inches for the 18-inch shingles and four in 2 inches for24-inch shingles. The recommended exposures for thestandard wood-shingle size are shown in table 3-6.Figure 3-26 shows the proper method of applying awood-shingle roof. Underpayment or roofing felt is notrequired for wood shingles except for protection in icejam areas. Although spaced or solid sheathing isoptional, spaced roof sheathing under wood shingles ismost common. Observe the following steps whenapplying wood shingles:1. Extend the shingles 1 1/2 inches beyond the caveline and 3/4 inch beyond the rake (gable) edge.Table 3-6.-Recommended Exposure for Wood Shingles3-20
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