| Grades |
Premium Grade:
clear heartwood, 100% edge grain
Number 1 Grade:
clear heartwood, maximum 10% flat grain
Number 2 Grade:
lower half is clear, flat and cross grains allowed, tight knots and defects allowed in upper half |
|
| Length |
18-inch (455 mm) |
| Thickness |
5/8 inch (16 mm) Medium, butt thickness,
(1/2 inch (13 mm) on Number 2 Grades)
3/4 inch (19 mm) Heavy, minimum butt thickness |
| Width |
Random, 4-inch (100 mm) minimum
(3-inch (75 mm) on Number 2 Grades)
14-inch (350 mm) maximum |
| Roof-Pitch |
4:12 minimum
(lower slopes require special application) |
| Exposure |
|
| |
18 Inch Perfections |
| Pitch |
Premium and No. 1
Blue Label |
No. 2
Red Label |
| 4:12 or > |
7 1/2"
190 mm |
5 1/2"
140 mm |
| Walls |
8 1/2"
210 mm |
7 1/2"
190 mm |
|
| |
