Resources

Domestic Plywood Grade Rules

Face Grades
A Grade
B Grade
C Grade
D Grade
Birch, Ash, Maple and Poplar: Rotary-Cut, Quarter-Cut, Plain-Sliced
Pin Knots and Small Burls, Comb. Avg.
ANSI
10- 4 to 1/4″
16- 8 to 1/4″
No Limit
No Limit
Conspicuous Burls, Max.
ANSI
3/8″
1/2″
No Limit
No Limit
Sound and Repaired Knots in Comb
ANSI
No
4
8
10
Repaired Knots
ANSI
No
4 to 1/8″
4 to 1/2″
5 to 3/4″
Mineral Streaks
ANSI
Slight
Slight
Yes
Yes
Vine
ANSI
Slight
Yes
Yes
Yes
Rough Cut
ANSI
No
Slight
Two 8″ Areas
5% of Panel
Blended Repaired Tapering Hairline Splits
ANSI
Two 1/16″ x 6″
Four 1/8″ x 8″
Four 3/16″ x 8″
Six 1/4″ x 10″
Face Grades
A Grade
B Grade
C Grade
Red and White Oak: Rotary-Cut, Quarter-Cut, Plain-Sliced
Pin Knots and Small Burls, Comb. Avg.
ANSI
12-10 to 1/4″
24-16 to 1/4″
No Limit
Sound and Repaired Knots in Comb
ANSI
No
4
8
Repaired Knots
ANSI
No
4 to 1/8″
4 to 1/2″
Mineral Streaks
ANSI
Slight
Few to 8″
Yes to 12″
Sap
ANSI
5%
Up to 20%
Yes
Blended Repaired Tapering Hairline Splits
ANSI
Two 1/16″ x 6″
Four 1/8″ x 8″
Four 3/16″ x 8″
Back Grades
1 Back
2 Back
3 Back
4 Back
Sound Tight Knots
ANSI
16 to 3/8″
16 to 3/4″
Max 16 1/2″-1 1/2
Yes
Knotholes
ANSI
No
All Repaired
All 3/8″ 10 to 1
Up to 4″
Repaired Knots
ANSI
No
8 to 1/2″
Not
No
Sound Tight Burls
ANSI
Yes
Yes
Yes
Yes
Mineral Streaks
ANSI
Yes/Yes
Yes/Yes
Yes/Yes
Yes/Yes
Rough Cut
ANSI
Two 8″ Dia. Areas
Yes
Yes
Yes
Joints or Splits
ANSI
Six 1/8″ x 12″ Rep’rd
Six 3/16″ x 12″ Rep’rd
3/8″ x 1/4″ LOP
1″ to 1/4 LOP,
1/2″ to 1/2 LOP,
1/4″ to Full LOP