| Product |
Grade |
Grade Characteristics and
Typical Uses |
*
Marine Grades: 1" to 20"thick, 2" to 20"wide
See tables 1 and 2 for design values |
|
Any grade of dimension Lumber or
Timbers |
All four
longitudinal faces must be free of pith and / or heartwood. Application of the product
requires pressure treatment by an approved treating process and preservative for marine
usage. |
*
Decking, Heavy Roofing and Heavy Shiplap: 2" to 4" thick, 2" and wider
See SPIB Grading Rules for design values |
|
Dense Standard Decking |
High-quality
product, suitable for plank floor where face serves as finish floor. Has a better
appearance than No. 1 Dense Dimension Lumber because of additional restrictions on pitch,
knots, pith and wane. |
|
Dense Select Decking Select
Decking |
An excellent
decking grade that can be used face side down for roof decking or face side up for floor
decking. |
|
Dense Commercial Decking
Commercial Decking |
An economical
roof decking which conforms to No. 2 Dimension Lumber characteristics. |
Boards:
1" to 1-1/2" thick, 2" and wider
See SPIB Grading Rules for design values |
|
Industrial 55 |
Graded as per No. 1 Dimension. |
|
Industrial 45 |
Graded as per No. 2 Dimension |
|
Industrial 26 |
Graded as per
No. 3 Dimension. |
| Design values are not
assigned |
|
No. 1 |
High quality with good appearance
characteristics. Generally sound and tight-knotted. Largest hole permitted is 1/16".
Superior product suitable for a wide range of uses including shelving, crating, and form
lumber. |
|
No.2 |
Good-quality sheathing, fencing,
shelving and other general purpose uses. |
|
No. 3 |
Good, serviceable sheathing;
usable for many economical applications without waste. |
|
No. 4 |
Admits pieces below a No. 3 grade
which can be used without waste, or which contain less than 25% waste by cutting. |
*Industrial
Lumber: 4" and less in thickness, 12" and less in width
See SPIB Special Product Rules for design values |
|
Industrial 86 |
Appearance is same as B&B
Finish. Larger sizes conform to Dense Structural 86 Structural Lumber except for dense
grain requirement. |
|
Industrial 72 |
Appearance is same as C Finish.
Larger sizes conform to Dense Structural 72 Structural Lumber except for dense grain
requirement. |
|
Industrial 65 |
Appearance is same as D Finish.
Larger sizes conform to Dense Structural 65 Structural Lumber except for dense grain
requirement. |
*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. |
