Dimension Lumber - Grades and Uses



Normal size (in.)
Grade
Common grade mix
Principal Uses
2" to 4" thick
2" and wider
Select Structural
No. 1
No. 2
No. 2 and Better
(No. 2 & Btr.)
Most common: used in most construction. Show high strength, stiffness and good appearance. Preferred for trusses, rafters, and joists.
"
No. 3
-
Used in construction where high strength and appearance are not important, such as studs in non-load bearing walls.
2" to 4" thick
2" to 4" wide
Constructions
Standard
Standard and Better
Common mix used in general framing work. Have less strength and shorter spans than No. 2 & Btr. structural light framing.
"
Utility
-
Used most economically where high strenght is not important, such as studs and plates in partition walls, blocking and bracing.
"
Economy
-
Used in temporary or low cost construction where strength and appearance are not important
2" to 4" think,
2" and wider
Stud
-
Most common grade intended for all stud uses.
"
Economy Stud
-
Used in temporary or low cost construction where strength and appearance are not important