| Product |
Grade |
Grade
Characteristics and Typical Uses |
* Structural Lumber: 2" and thicker, 2" and wider
See SPIB Special Product Rules for design values |
|
Dense Structural 86 |
Premier structural grades. Provides good appearance with some of the highest
design values available in any softwood species. |
| Dense Structural 72 |
| Dense Structural 65 |
Radius Edge Decking: 1-1/4" thick, 4" to 6" wide
See SPIB Special Product Rules for recommended spans |
|
Premium |
High-quality
product, recommended where smallest knots are desired and appearance is of utmost
importance. Excellent for painting or staining. |
|
Standard |
Slightly
less restrictive than premium grade. A very good product to use where appearance is not
the major factor. Excellent for painting or staining. |
Finish: 3/8" to 4" thick, 2" and wider
Design values are not assigned |
|
* B&B |
Highest recognized
grade of Finish. Generally clear, although a limited number of pin knots are permitted.
Finest quality for natural or stain finish. |
|
C |
Excellent for
painting or natural finish where requirements are less exacting. Reasonably clear, but
permits limited number of surface checks and small tight knots. |
|
C&Btr |
Combination
for B&B and C grades; satisfies requirements for high-quality finish. |
|
D |
Economical,
serviceable grade for natural or painted finish. |
Flooring, Drop Siding, Paneling, Ceiling and Partition, OG Batts, Bevel
Siding, Miscellaneous Millwork
Design values are not assigned |
|
*B&B, C
C&Btr, D |
See Finish grades for
face side; reverse side wane limitations are lower. |
|
No. 1 |
No. 1 Flooring and
Paneling not provided under SPIB Grading Rules as a separate grade, but if specified, will
be designated and graded as D; No. 1 Drop Siding is graded as No. 1 Boards |
|
No. 2 |
Graded as No. 2
Boards, High utility value where appearance is not a factor. |
|
No. 3 |
More manufacturing
imperfections allowed than in No. 2, but suitable for economical use. |
*Shop and Moulding
Design values are not assigned |
|
No. 1 |
Recommended
for moulding and millwork applications. Currently graded according to rules developed by
the Western Wood products Association. |
| No. 2 |
| No. 3 |
*Most
mills do not manufacture all products and make all grade separations. Those products and
grades not manufactured by most mills are noted with an asterisk. |
