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Minimum Size Board
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6" x 8'
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Same as FAS for species being graded
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4" x 6'
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3" x 4'
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3" x 4'
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3" x 4'
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3" x 4'
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Pith = SM in inches
Wane = 1/2 Length
Knot = 1/3 SM
Warp = Entire board must be flat enough to S2S to S.S.T.
Splits = Not to exceed 2 x SM or 12", whichever is greater
Splits shall not diverge 1" in 12"
First Lineal Rule: Applies to both ends of board to contain not less than 50% clear wood, 25% sound wood.
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Wane in FAS 1 FACE
FAS limitation applied to better face
#1 COM side: 1/3 W or 1/2 L widest wane added together; Length can be on both edges
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Minimum Size Cutting
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4" x 5'
3" x 7'
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Better face to grade FAS
Poor face to grade #1 COM
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4" x 2'
3" x 3'
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3" x 2'
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3" x 2'
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Not less than 1 - 1/2" wide containing 36 sq. inches
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Wane in Selects
Pcs. 6" & Wider
FAS limitation applies to better face.
#1 COM side: 1/3 W or 1/2 L
Widest wane added together.
Length can be on both edges.
Pcs. 4" & 5" Wide
1/3 W or 1/2 L applies to both faces.
Add widest wane together.
Add total length of wane from both edges.
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Basic Yield
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SM x 10
83 - 1/3%
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SM x 8
66 - 2/3%
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SM x 6
50%
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SM x 4
33 - 1/3%
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SM x 3
25%
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Formula to Determine Number of Cuts
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SM
4
(4 max)
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SM + 1
3
(5 max)
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SM
2
(7 max)
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Unlimited
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Unlimited sound cuttings
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SM Needed to Take Extra Cutting
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6 - 15' SM
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3 - 10' SM
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2 - 7' SM
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Extra Yield Needed for Extra Cutting
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SM x 11
91 - 2/3%
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SM x 9
75%
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SM x 8
66 - 2/3%
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Special Yields
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97% Rule - 2 cuts full widths any length; Pcs. 6" & wider with 6 - 12' SM
SM x 11.64 for yield
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97% Rule - On better face
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97% Rule - On better face 2' x 3' SM to be 100% clear or SM x 11 in one cutting
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1' SM - SM x 12 or 100% clear 2' SM - SM x 9
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1' SM - SM x 8
#2A COM - clear cuttings
#2B COM - sound cuttings
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#2A COM on better face and reverse side of cuttings sound; will also qualify for #3A COM
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NOTE: This chart summarizes the main requirements for the standard grades. For complete information, consult the appropriate
section of the NHLA Rule Book.
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