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2" x 4" Hiline #1 Premium Grade SPF KDHT S4S Dimensional Lumber
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2" x 4" Hiline #1 Premium Grade SPF KDHT S4S Dimensional Lumber
This is a 2x4 in Hiline #1 premium 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 3-1/2 in. actual and comes in long 14 and 16 ft lengths.
#1 premium grade means fewer and smaller defects than #2. That makes it a good pick for long plates, rafters, ledgers and visible framing where straighter, cleaner boards matter. Span, load and local code still decide where it can be used, so confirm with your building inspector or engineer for structural work.
Features and Common Uses
- #1 premium grade SPF, a framing grade with fewer and smaller knots and defects than #2
- SPF is a species group of spruce, pine and fir, light in weight and easy to cut and nail
- 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 3-1/2 in. actual size
- Long 14 and 16 ft lengths reduce splices on long runs
- Not pressure treated, so keep it dry and out of ground contact
Commonly used for:
- Long wall plates and top plates
- Rafters, ledgers and long blocking runs
- Shop, garage and shed framing
- Furring, bracing and general carpentry
Specifications
| Product | 2x4 Hiline #1 Premium SPF, KDHT, S4S |
|---|---|
| Species | SPF (spruce-pine-fir) |
| Brand line | Hiline |
| Grade | #1 Premium |
| Nominal size | 2 in. x 4 in. |
| Actual size | 1-1/2 in. x 3-1/2 in. |
| Available lengths | 14 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. Span, load and local code decide where the lumber can be used, so confirm with your building inspector or engineer for structural work. 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
What does #1 premium grade mean?
#1 is a visual framing grade with fewer and smaller knots, splits and other defects than #2. Premium means the boards are selected for a cleaner, straighter look, which reduces culling and waste on the job site.
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 2x4?
A 2x4 measures 1-1/2 in. x 3-1/2 in. once surfaced. The 2 in. x 4 in. name is the nominal size from before the board was dried and planed.
What does S4S mean?
S4S means surfaced on four sides. All four faces are planed smooth, so the board has square, consistent edges and no rough-sawn surface.
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.