| FAS | F1F | SELECT | #1C | #2A & 2B | #3A COM | #3B COM | FAS LIMITS | ||
| 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. |
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 |
| 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-/2" wide containing 36 sq. inches | Wane in Selects Pcs. 6" & Wider FAS limitations 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. |
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| Basic Yield | SM x 10 83-1/3% |
SM x 8 66-2/3% |
SM x 6 50% |
SM x 4 33-1/3% |
SM x 3 25% |
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| 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' x 3' SM to be 100% clear or SM x 11 in one cutting | 1' SM - 100% 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 cuttings sound; will also qualify for 3A Com | NOTE: This chart summarizes the main requirements for the standard grade. For complete information, consult the appropriate section of the NHLA Rule Book. | ||
Reference: www.NHLA.com
Color Sorting
In addition to sorting for grades or selecting specific widths, various species are commercially sold at an added value when colour is also considered. It is important to note, color in this explanation refers to sapwood and heartwood.
Number 1 and 2 white
A color selection typically made on hard maple, but can be applied to any species where sapwood clear cuttings are desired, such as ash, birch, and soft maple.
Number 1 white: both faces and edges of the clear cuttings must be all sapwood.
Number 2 white: one face and both edges of the clear cuttings must be sapwood and not less than 50% sapwood on the reverse face.
Sap and Better
Commercially sold when only one face of the board needs to be sapwood. Usually applied to the same species as Number 1 and 2 White, although just a little less stringent. In Sap and Better every board should have a minimum of one sapwood face in the clear cuttings.
