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NO. 3 GRADE – STRUCTURAL • Characteristics permitted and limiting provisions shall be:

Checks- seasoning checks not limited. Through checks at ends are limited as splits.

Knots- well spaced knots of any quality are permitted in the following sizes or their equivalent displacement:

  Pockets - pitch or bark, not limited.

Shake - surface shakes permitted. If through at edges or ends, limited as splits; Elsewhere through shakes 1/3 the length, scattered along the length.

Skips - hit or miss, with a maximum of 10% of the pieces containing heavy skips.

Slope of Grain - 1 in 4.

Splits - equal to 1/6 the length of the piece

Stain - stain wood, not limited

Unsound Wood - spots or streaks limited to 1/3 the cross section at any point along the length. Must not destroy the nailing edge.

Wane - 1/2 the thickness and 1/2 the width full length, or equivalent on each face, provided that wane not exceed 7/8 the thickness or 3/4 the width for up to 1/4 the length.

Warp - medium.

White Speck & Honey Comb - firm.
Nom. Width At Edge
Wide
Face 		Centerline
Wide
Face		 Holes
(any
cause)
2" 3/4" 3/4" 3/4"
3" 1 1/4" 1 1/4" 1 1/4"
4" 1 3/4" 2 1/2" 1 3/4"
5" 2 1/4" 3" 1 7/8"
6" 2 3/4" 3 3/4" 2"
8" 3 1/2" 4 1/2" 2 1/2"
10" 4 1/2" 5 1/2" 3
12" 5 1/2" 6 1/2" 3 1/2"

Manufacture - Standard “F” Manuacture admits: very heavy torn grain; raised grain; very heavy loosened grain; heavy machine bite; machine gouge; heavy machine offset; chip marks; knife marks; medium wavy dressing; medium mismatch.

Pitch & Pitch Streaks - not limited.

 




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