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2" x 6" #3 Grade SPF KDHT S4S Dimensional Lumber
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2" x 6" #3 Grade SPF KDHT S4S Dimensional Lumber
This is a 2x6 in #3 grade SPF (spruce-pine-fir), kiln dried and heat treated (KDHT) and surfaced smooth on all four sides (S4S). It measures 1-1/2 in. x 5-1/2 in. actual and comes in 8 and 16 ft lengths.
#3 is the lowest of the structural light framing grades, below #2. It allows larger and more frequent knots and defects, so it suits blocking, bracing, forming, crating and general jobs where a #2 and better board is not needed. For load-bearing framing, choose a #2 and better 2x6 and confirm what your building inspector requires.
Features and Common Uses
- #3 grade SPF, an economy framing grade that keeps the cost of general-purpose 2x6 stock down
- SPF is a species group of spruce, pine and fir, light in weight and easy to cut and nail
- Kiln dried to 19% moisture content or less, so it arrives drier and more stable than green lumber
- Heat treated (KD-HT) to a core temperature of at least 56 C for a minimum of 30 minutes
- Surfaced smooth on all four sides (S4S) for a consistent 1-1/2 in. x 5-1/2 in. actual size
- Not pressure treated, so keep it dry and out of ground contact
Commonly used for:
- Blocking, bridging and bracing between framing members
- Temporary framing, concrete form backing and job-site bracing
- Crating, pallets and shipping frames
- Garage shelving, workbench tops and shop projects
- Short cut-offs and fillers where grade and appearance do not matter
Specifications
| Product | 2x6 #3 SPF, KDHT, S4S |
|---|---|
| Species | SPF (spruce-pine-fir) |
| Grade | #3 |
| Nominal size | 2 in. x 6 in. |
| Actual size | 1-1/2 in. x 5-1/2 in. |
| Available lengths | 8 and 16 ft |
| Moisture content | Kiln dried, 19% maximum |
| Heat treatment | KD-HT, core temperature of at least 56 C for 30 minutes |
| Surfacing | S4S, surfaced on four sides |
| Pressure treated | No |
Grade, species and heat-treatment marks are stamped on each board and are the governing record for the piece you receive. KD-HT lumber is dried to 19% moisture content or less and heated to a core temperature of at least 56 C for 30 minutes.
Frequently Asked Questions
Can I use #3 grade for framing?
Not for load-bearing framing unless your building inspector or engineer accepts it. #3 is graded below No. 2 and allows larger and more frequent defects. Use a #2 and better 2x6 for joists, rafters and headers, and keep #3 for blocking, bracing, forming and general work.
What does KDHT mean?
KDHT means kiln dried and heat treated. The board is dried to 19% moisture content or less and heated to a core temperature of at least 56 C for a minimum of 30 minutes. It is a heat process, not a chemical preservative treatment.
What is SPF?
SPF is a commercial species group of spruce, pine and fir. The wood is light and easy to work, and it is graded and sold together as one group.
What is the actual size of a 2x6?
A 2x6 measures 1-1/2 in. x 5-1/2 in. once surfaced. The 2 in. x 6 in. name is the nominal size from before the board was dried and planed.
Can I use it outside?
Only for short-term or covered use. It is not pressure treated, so it will rot in ground contact or constant wet. For outdoor and ground-contact jobs, choose pressure treated lumber.