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Grades:
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NUMBER 1 GRADE: clear heartwood, 100% edge grain, no defects
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NUMBER 2 GRADE: clear face from butt end - 11" on 18-inch shingles and 16" on 24-inch shingles, limited sapwood and flat grain, limited knots and defects above clear portion.
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NUMBER 3 GRADE: clear face from butt end -6" on 18-inch shingles and 10" on 24-inch shingles, unlimited sapwood and flat grain, limited knots and defects above clear portion allowed, tight
knots and defects allowed in upper half.
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Lengths:
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24-inch Royals, 18-inch Perfections, 16-inch 5X.
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Thickness:
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0.5-inch Royals, 0.45-inch Perfections, 0.4-inch 5X.
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Width:
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Random, 4-inch minimum, (3-inch on Number 3 Grades) 14-inch maximum
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Roof Pitch:
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3:12 minimum
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