| Product |
Dimension Lumber: 2" to 4" thick, 2" and wider
See table 1 for design values
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Grade
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Grade Characteristics and Typical Uses
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Dense Select Structural*
Select Structural
Select Structural NonDense*
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High quality, limited in characteristics that affect strength or stiffness. Recommended for uses where high strength, stiffness and good appearance are desired.
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No.1 Dense*
No.1
No.1 NonDense*
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Recommended for construction where high strength, stiffness and good appearance are desired. |
No.2 Dense*
No.2
No.2 NonDense*
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Recommended for most general construction uses where moderately high design values are required. Allows well-spaced knots of any quality. |
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No.3
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Assigned design values meet a wide range of design requirements. Recommended for general construction purposes where appearance is not a controlling factor. Many pieces included in this grade would qualify as No.2 except for a single limiting characteristic. |
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Stud
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Suitable for stud uses including use in load-bearing walls. Composite of No.3 strength and No.1 nailing edge characteristics.
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Construction (2" to 4" wide only)*
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Recommended for general framing purposes. Good appearance, but graded primarily for strength and serviceability.
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Standard (2" to 4" wide only)*
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Recommended for same purposes as Construction grade. Characteristics are limited to provide good strength and excellent serviceability.
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Utility (2" to 4" wide only)*
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Recommended where a combination of economical construction and good strength is desired. Used for such purposes as studding, blocking, plates, bracing and rafters.
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Design values are not assigned
Economy
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Usable lengths suitable for bracing, blocking, bulkheading and other general utility purposes where strength and appearance are not controlling factors.
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Prime Dimension: 2" to 4" thick, 2" to 12" wide
See table 1 for design values
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Grade
|
Grade Characteristics and Typical Uses
|
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No.1 Prime
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Recommended where appearance and strength are a consideration. Grade based on No.1 Dimension Lumber except wane and other characteristics that affect appearance are limited.
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No.2 Prime
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Recommended where appearance and strength are a consideration. Grade based on No.2 Dimension Lumber except wane and other characteristics that affect appearance are limited.
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*Timbers: 5" x 5" and larger
See table 2 for design values
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|
Grade
|
Grade Characteristics and Typical Uses
|
Dense Select Structural
Select Structural
|
Recommended where high strength, stiffness and good appearance are desired.
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No.1 Dense
No.1
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Recommended for general construction uses. Similar in appearance to No.1 Dimension Lumber.
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No.2 Dense
No.2
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Recommended for general construction uses. Similar in appearance to No.2 Dimension Lumber.
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Design values are not assigned
No.3
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Non-stress rated, but economical for general utility purposes such as bracing, blocking, bulkheading, etc. |
*Mechanically Graded Lumber - Machine Stress Rated (MSR) Lumber:
2" and less in thickness, 2" and wider
See table 3 or SPIB Grading Rules for design values
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Grade
|
Grade Characteristics and Typical Uses
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1650f - 1.5E
thru
3000f - 2.4E
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Machine Stress Rated (MSR) lumber is lumber that has been evaluated by mechanical stress rating equipment. MSR lumber is distinguished from visually stress graded lumber in that each piece is non-destructively tested. MSR lumber is also required to meet certain visual grading requirements.
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*Mechanically Graded Lumber - Machine Evaluated Lumber (MEL):
2" and less in thickness, 2" and wider
See table 3 or SPIB Grading Rules for design values
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Grade
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Grade Characteristics and Typical Uses
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M-5 thru M-31
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Well-manufactured material evaluated by calibrated mechanical grading equipment which measures certain properties and sorts the lumber into various strength classifications. Machine Evaluated Lumber is also required to meet certain visual requirements.
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* 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.
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