#3 COMMON GRADE - BOARDS
Lumber of this grade is widely used for a large range of building purposes where appearance and strength are both important. With characteristics limited to assure a high degree of serviceability, this grade is often use for shelving, paneling and siding, and is especially suited for fences, boxes, crating, sheathing, and many industrial uses. Characteristics permitted and limiting provisions shall be:
| Checks - seasoning, medium. Roller check – 1, 3’ light on face; light to medium 2/3 length on back. Crook - as per NLGA ‘Crook Table for Commons’ (Para. 810b) Cup - medium Knots- limited as follows
Pin Holes or Small Holes- 30 per square foot or 4 small holes in a 1”x8”x12’. |
Pitch - heavy over 1/2 the area or 2 small streaks of massed pitch. Pockets - medium, well-scattered. Shake - light to medium, scattered full length in otherwise 2 Common type. Skips - One medium on face, hit and miss on back for 2/3 the length. One edge may be ” scant for 1/2 the length or ” scant full length. Splits - 1/6 length. Stain - medium to heavy over the entire face. Torn Grain - medium. Twist - 7/4 & thinner, light. 8/4 & thicker, 1/2 of light. Unsound Wood - similar to firm white speck; limited to 1/8 the area Wane - on back, 2/3 thickness, 1/4 width, 1/2 length or equivalent in an occasional piece. |
*Black knots may be 2/3 size of allowable red knots, 2 maximum in each 12’ of length or equivalent smaller tight black knots. **Fixed knots may be equal to knot hole is size and are limited to 2 per 12’ of length when not in serious combinations with other characteristics. ***Only one maximum size knot hole is permitted on any one piece, but two equivalent smaller knot holes may be permitted if well spaced and the piece is otherwise of high quality.
