Defects
Grade A
Grade B
Grade C
Sapwood
Allowed
Heartwood
Color Streaks or Spots
Slight
Color Variation
Now Allowed
Type of Matching
Book Matched
--
Pleasing Matched
No Limit
Knots
Conspicuous Pin Knots
Max. Size-Sound Knots Max. Size-Repaired Knots Avg. No.-Repaired Knots
50.8mm 50.8mm 19mm
89mm 89mm 38mm
Yes Yes No Limit
Mineral Streaks
Less
Bark Pockets
Few to 3.2mm×25.4mm
Few to 3.2mm×50.8mm
Torn grain
Blended Repaired Tapering Hairline Splits
Repairs
Blend
Knife mark
Unfilled wormholes, open splits, open joints, open bark pockets, or doze not allowed in above grades.
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