NO. 2 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:
Nom. Width |
At Edge
Wide
Face |
Centerline
Wide
Face |
Holes
(any
cause)
|
2" |
5/8" |
5/8" |
5/8" |
3" |
7/8" |
7/8" |
7/8" |
4" |
1 1/4" |
2"` |
1 1/4" |
5" |
1 5/8" |
2 3/8" |
1 3/8" |
6" |
1 7/8" |
2 7/8" |
1 1/2" |
8" |
2 1/2" |
3 1/2" |
2" |
10" |
3 1/4" |
4 1/4" |
2 1/2" |
12" |
3 3/4" |
4 3/4" |
3" |
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.
Pockets - pitch or bark, not limited.
|
|
Shake - if through at ends, limited as splits. Away from ends through shakes up to 2’ long, well separated. If not through, singe shakes shall not exceed 3’ long or 1/4 the length, whichever is greater.
Skips - hit and miss, with a maximum of 5% of the pieces containing hit or miss or heavy skip 2’ or less in length.
Slope of Grain - 1 in 8.
Splits- equal in length to 1½ the width of the piece
Stain - stained sapwood. Firm heart stain or firm red heart not limited.
Unsound Wood - (excluding white specks) Not permitted in thicknesses over 2”. In 2” lumber, small spots or streaks of firm honeycomb or peck are limited to 1/6 the width. Any other Unsound Wood is limited to spot 1/12 the width and 2” in length or equivalent smaller.
Wane - 1/3 the thickness and 1/3 the width full length, or equivalent on each face, provided that wane not exceed 2/3 the thickness or 1/2 the width for up to 1/4 the length.
Warp - light.
White Speck & Honey Comb - firm, 1/3 the face or equivalent. |