BACK GRADES (From Table 6©)

BACK GRADES (From Table 6©)
Grade Description 1 Back 2 Back 3 Back 4 Back
Sapwood Yes Yes Yes Yes
Discoloration & Stain Yes Yes Yes Yes
Mineral Streaks Yes Yes Yes Yes
Sound Tight Burls Yes Yes Yes Yes
Sound Tight Knots Max. diameter 3/8″ Max. diameter 3/4″ Max. diameter 1 1/2″ Yes
Max. Number of Tight Knots 16 16 Unlimited to 1/2″;No more than 16 from 1/2″ to 1 1/2″ Unlimited
Knotholes No 1/2″ repaired 1″ 4″
Max. Combined Number of Knotholes and Repaired Knots None All repaired;Unlimited to 3/8″;No more than 8 from 3/8″ to 1/2″ Unlimited to 3/8″;No more than 10 from 3/8″ to 1″ Unlimited
Wormholes Filled Filled Yes Yes
Splits or Open Joints Six 1/8″ x 12″ repaired Six 3/16″ x 12″ repaired Yes, 3/8″ x 1/4″Length of Panel (LOP) 1″ to 1/4 LOP1/2″ to 1/2 LOP1/4″ to Full LOP
Doze & Decay Firm areas of doze Firm areas of doze Firm areas of doze Areas of doze and decay provided serviceability of panel is not impaired
Rough Cut/Ruptured Grain Two 8″ diameter areas 5% of panel Yes Yes
Bark Pockets 1/8″ wide repaired 1/4″ wide repaired Yes Yes
Laps No Repaired Yes Yes
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