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#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

  

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.
Face Width Fixed Knots
Firm & Tight
Knots

Loose Knots
Knot Holes

2" 1" "
3" 1 1/2" "
4" 2 1/2" 3/4"
6" 3" 1 1/4"
8" 3 1/2" 1 1/2"
10" 4" 1 3/4"
12" 4 1/2" 2 1/4"
14" & wider 5" 2 1/2"

Pin Holes or Small Holes- 30 per square foot or 4 small holes in a 1”x8”x12’.

 




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