Pressure Treated
Above Ground (UC3B)
Pressure treated for above-ground outdoor use — deck boards, fencing, outdoor framing
Standard: AWPARelative price: Mid-RangeRank: 2
What this grade means
UC3B (Use Category 3B) above-ground treated lumber is pressure-treated for outdoor use where the wood will not be in direct ground contact. Suitable for deck boards, stair treads, railing, and other outdoor applications that are exposed to weather but elevated above grade.
Defects allowed
Same structural defects as base grade, preservative tint present
Typical uses
Deck boards, stair treads, railing, fascia, outdoor framing above ground, fence boards
Grade rules vary by species, region and grading agency. For structural work, use the grade stamp and governing code or an engineer’s specification—not appearance alone.
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