Number 2 Lumber Grade (#2)

Category: infrastructure

The standard construction-grade classification for dimensional lumber used in residential framing.

Graded according to guidelines enforced by the American Lumber Standards Committee, #2 grade allows for moderate knots and edge wane while guaranteeing the baseline bending stress and structural load capabilities required by universal building codes for wall studs and floor joists.

Common Examples

• Although the building code allows utility grades for light structures, we frame with #2 lumber to maximize structural sound.
• The structural calculation model assumes a standard #2 lumber grade when mapping out the allowable span boundaries for floor joists.