LUMBER GRADES
Standard Grades Requirements
| FAS | FIF | SELECT | #1 COM | #2 & 2B | #3A COM | #3B COM | FAS LIMITS | Additional Notes | |
|---|---|---|---|---|---|---|---|---|---|
| Minimum Size Board | 6" x 8' | Same as FAS for species being graded | 4" x 6' | 3" x 4' | 3" x 4' | 3" x 4' | 3" x 4' |
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. (1 Common Limit Pith cannot exceed 1/2 the length in the aggregate.) |
Wane in FAS 1 FACE
FAS limitation applies to Better Face. #1 Common Side: 1/3 W or 1/2 L Widest wane added together; Length can be on both edges. Wane in Selects Pcs. 6” & Wider FAS limitation applies to Better Face. #1 Common 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. |
| Minimum Size Cutting | 4″ x 5′, 3″ x 7′ |
Better Face to Grade FAS, Poor Face to Grade #1 Common |
4″ x 2′, 3″ x 3′ | 3″ x 2′ | 3″ x 2′ | Not less than 1 1/2″ wide containing 36 sq. inches | |||
| Basic Yield | SM x 10, 83-1/3% |
SM x 8 = 60-2/3% | SM x 6 = 50% | SM x 4 = 33-1/3% | SM x 3 = 25% | ||||
| Formula to Determine Number of Cuts | SM 4 (4 max.) |
SM + 1 3 (5 max.) |
SM 2 (7 max.) |
Unlimited | Unlimited Sound Cuttings | ||||
| SM Needed to Take Extra Cutting | 6-15′ SM | 3-10′ SM | 2-7′ SM | ||||||
| Extra Yield Needed for Extra Cutting | SM x 11 91-2/3% |
SM x 9 75% |
SM x 8 66-2/3% |
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| Special Yields |
97% Rule - 2 cuts full widths, any length; Pcs. 6″ & wider with 6-12' SM SM x 11.64 for Yield |
97% Rule - On Better Face | 97% Rule -
On Better
Face; 2’ & 3’ SM to be 100% clear or SM x 11 in one cutting |
1’ SM - SM x 12 or 100% clear 2’ SM - SM x 9 | 1′ SM - SM x 8 #2A Com - Clear Cuttings, #2B Com - Sound Cuttings |
#2A Com on Better Face and reverse side of sound cuttings; will also qualify for 3A Com | |||
NOTE: This chart summarizes the main requirements for the standard grades. For complete information, consult the appropriate section of the NHLA Rule Book.