|
| |
SUMMARY
OF HARDWOOD FACE GRADE CHARACTERISTICS
Ash,
Birch and Maple
(See Pictures)
| Cut |
Plain-Sliced,
Quarter and Rift Cut
|
| Grade
Description |
AA
|
A
|
B
|
| Colour and Matching |
White
|
Red
|
Nat.
|
White
|
Red
|
Nat.
|
White
|
Red
|
Nat.
|
| Sapwood |
Yes
|
No
|
Yes
|
Yes
|
No
|
Yes
|
Yes
|
No
|
Yes
|
| Heartwood |
No
|
Yes
|
Yes
|
No
|
Yes
|
Yes
|
No
|
Yes
|
Yes
|
| Colour Streaks
or Spots |
No
|
No
|
No
|
Slight
|
Slight
|
Slight
|
Yes
|
|
|
| Colour
Variationa |
No
|
No
|
No
|
Yes
|
Slight
|
Slight
|
Yes
|
|
Yes
|
| Sharp Colour
Contrasts at Joints |
No
|
No
|
No
|
| Type
of Matching |
| Sequence
Matched
Book Matched
Slip Matched
Pleasing Matched
|
Yes
Yes
Specify
---
|
No
Yes
Specify
---
|
No
Specify
Specify
---
|
| Nominal
Minimum Width of Components in Face |
5"
|
5"
|
4" If book or
slip
|
|
Natural
Characteristics
|
| Small
Inconspicuous Burls & Pin
Knots - Combined Avg. No.
|
1 per 5 sq. ft.
6 per 4'x8' panel
|
1 per 3 sq. ft.
10 per 4'x8' panel
|
1 per 2 sq. ft.
16 per 4'x8' panel
|
| Burls - Max
Size |
No
|
1/4"
|
3/8"
|
| Knots Max.
Size;
Dark Part
Total
|
1/4"
|
1/8"
1/4"
|
1/8"
|
| Scattered
Sound and Repaired
Knots - Combined Avg. No.
Max. Size - Sound
Max. Size - Repaired
Avg. No. - Repaired
|
No
|
No
|
1 per 8 sq. ft.
4 per 4'x8' panel
3/8"
1/8"
1 per 8 sq. ft.
|
| Mineral
Streaks |
No
|
Slight
|
Slight
|
| Bark Pockets |
No
|
No
|
Few to
1/8"x1"
|
| Worm Tracks |
No
|
No; Ash, slight
|
Slight; Ash, yes
|
| Vine Marks |
No
|
Slight
|
Yes
|
| Cross Bars |
No
|
Slight
|
Yes
|
|
Manufacturing
Characteristics
|
| Rough Cut |
No
|
No
|
Slight
|
| Blended
Repaired Tapering Hairline Splits |
Two
1/32"x3" on
panel ends only
|
Two
1/16"x6"
|
Four
1/8"x8"
|
| Repairs |
Very small
inconspicuous
|
Small
inconspicuous
|
Inconspicuous
|
|
Special
Characteristics
|
| Select and
Uniform colour |
Red only available
in Birch
|
Red only available
in Birch
|
Red only available
in Birch
|
Unfilled worm holes, open
splits, open joints, open bark pockets, shake or doze not permitted in
above grades. One inch = 25.4 mm; one sq. ft. = 0.0929 square metres.
Notes: Under
Colour and Matching, Red (R) available in birch only, Brown (B) available
in Ash only.
a Maple:
slight
| |
|
