Search results
Hardwood lumber is usually graded on the basis of the size and number of cuttings (pieces) that can be obtained from a board when it is cut up and used in the manufacture of a hardwood product.
The National Grading Rule establishes the lumber classifica-tions and grade names for visually stress-graded dimension lumber (Table 6–2) and also provides for the grading of dimension lumber by a combination of machine and visual methods.
27 sie 2020 · AMERICAN WOOD COUNCIL Table 4A Reference Design Values for Visually Graded Dimension Lumber (2" - 4" thick)1,2,3 (All species except Southern Pine — see Table 4B) (Tabulated design values are for normal load duration and dry service conditions. See NDS 4.3 for a comprehensive description of design value adjustment factors.)
The SPIB Standard Grading Rules for Southern Pine Lumber provide for numerous visual and mechanical lumber grades. However, not all of those possible grade/size combinations are produced or used in the marketplace.
The recommended design values shown in the accompany-ing tables are for applications where the moisture content of the wood does not exceed 19%. For use conditions where the moisture content of dimension lumber will exceed 19%, the Wet Use Adjustment Factors below are recommended: PROPERTY.
All boards are graded from the better face. There are four Eastern White Pine Common grades: Finish, Premium, Standard and Industrial. The grades of Finish and Premium may be grouped together as Premium & Btr. All thicknesses. Widths — 3” and wider. Lengths — 6’ to Skip — Hit and miss on reverse face or light skip on 16’.
know that hardwood l umber grades are entirel y different from pine l umber grades. Pine is generall y used in construction in the full width, thickness, and l ength that it is cut at the sawmill . Because the grades are based primaril y on strength, the size and distribution of knots are important. Pine is graded on the best side of the board.
