The information listed in the table below is based on the
Cedar Shake and Shingle Bureau, (CSSB-97) grade revisions for all Western
Red Cedar Certigrade® 18" Perfection shingles. It is intended to be used a
guide for product use and grade selection only. Thank you.
| Red Cedar 18"
Perfection Shingles |
No.1
Blue |
No.2
Red |
No.3
Black |
No.4
Green |
| WOOD: |
Clear Area
- above the butt |
All |
11" |
6" |
Butts Sound |
| |
Sapwood |
None |
1" |
Yes |
Yes |
| |
Flat Grain |
None |
Yes |
Yes |
Yes |
| |
Checks/Cracks |
None |
2" (to 16") |
2" (to 16") |
Yes |
| |
Defect Size |
None |
3" |
3" |
3" |
| |
Total Defect |
None |
1/2 width |
2/3 width |
no limit |
| LENGTH: |
Maximum |
None |
None |
None |
None |
| |
Minimum |
17" |
16" |
16" |
14" |
| |
Exposure Line |
5-1/2" |
4-1/2" |
4" |
n/a |
| WIDTH: |
Maximum |
None |
None |
None |
None |
| |
Minimum |
4" |
4" |
4" |
2-1/2" |
| |
Undersize % |
10% |
20% |
30% |
no limit |
| |
Min. Undersize |
3" |
3" |
3" |
no limit |
| |
Off Parallel/Square |
1/4" |
3/8" |
3/8" |
3/8" |
| THICKNESS: |
5 butts, measured together to equal 2-1/4" |
| COVERAGE: |
4 bundles per square |
635 lineal inches on grade per bundle |
| PACK: |
18" wide frame |
20/20 pack |
| |
20" wide frame |
18/18 pack |
Guide to CSSB-97 Grading Rules
Conforms to UBC 15-4, CSA 01118.1-97, CSSB-97
