This chart summarizes the main requirements for the standard grades. For complete information, consult the appropriate section of the NHLA Rule Book.
| FAS | FIF | SELECT | #1 COM | #2 & 2B | #3A COM | #3B COM | FAS LIMITS | ||
|---|---|---|---|---|---|---|---|---|---|
| Minimum 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 inchesWane= 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 Foot Rule: Applies to both ends of Board, to contain not over 25% unsound wood. | Wane in FASIFACE: FAS transmission applies to better face.#1 Common Side: 1/3W or 1/2L Widest wane added together: Length can be on both edges. Minimum Size Cutting 4″ x 5′ 3″ x 7′ BETTER FACE TO GRADE FASPOOR 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 Wane in Selects: Pcs. 6″ & Wider FAS limitation applies to Better face.#1 Common side: 1/3W or 1/2L Widest wane added together. Length can be on both side. Pcs. 4″ & 5″ Wide 1/3W or 1/2L 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 FASPOOR 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% | ||||||
| Special Yields | 97% Rule -2 cuts full width any length; Pcs. 6″ & wider with 6-12″ SM SM x 11.64 for Yield | 97% Rule On Better Face | 2 + 3 SM to be 100% clear or SM x 11 in one cutting on Better Face. 97% Rule | 1′ SM-100% 2′ SM SMx 9 | 1′ SM SMx 8 2A Com- Clear Face Cuttings 2B Com- Sound Cuttings | 2A Com on Better Face and reverse side of cuttings sound; will also qualify for 3A Com | |||