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4" x 4" Utility/#3 Grade Green S4S Fir Dimensional Lumber
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4" x 4" Utility/#3 Grade Green S4S Fir Dimensional Lumber
This is a 4x4 in Utility/#3 grade fir, sold green and surfaced smooth on all four sides (S4S). It is an economy post size in 10 and 12 ft lengths, used for stakes, bracing, concrete forming and general-purpose work.
Utility grade is an economy grade, not structural framing grade, and it is sold green. It is graded on usefulness and low cost rather than strength or appearance, and it still holds moisture, so it shrinks and can twist or check as it dries. For structural posts, choose our 4 x 4 #2 Grade Fir Dimensional Lumber and confirm what your building inspector requires.
Features and Common Uses
- Utility/#3 grade fir, an economy grade that keeps the cost of 4x4 stock down
- Green, with a moisture content above 19%, so it is soft to cut and nail
- Surfaced smooth on all four sides (S4S) for square edges and consistent faces
- A 4 in. nominal section is stiff enough for stakes, braces and short posts
- Not pressure treated, so keep it out of ground contact for permanent work
Commonly used for:
- Concrete form stakes, walers and shoring
- Job-site bracing and temporary supports
- Short fence, sign and landscape posts for temporary or covered use
- Pallet, crate and equipment framing
Specifications
| Product | 4x4 Utility/#3 Fir, Green, S4S |
|---|---|
| Species | Fir |
| Grade | Utility/#3 |
| Nominal size | 4 in. x 4 in. |
| Actual size, green | About 3-9/16 in. x 3-9/16 in., shrinking toward 3-1/2 in. as it dries |
| Available lengths | 10 and 12 ft |
| Moisture content | Green, above 19% |
| Surfacing | S4S, surfaced on four sides |
| Pressure treated | No |
Grade, species and moisture marks are stamped on each board and are the governing record for the piece you receive. Green lumber changes size as it dries, so confirm the dimensions you need at the counter before you order.
Frequently Asked Questions
Can I use utility grade for posts?
Not for structural or load-bearing posts unless your building inspector or engineer accepts it. Utility is graded below No. 2 and Standard. Use a #2 and better 4x4 for deck, porch and carport posts, and keep Utility/#3 for stakes, bracing and forming.
What does green lumber mean?
Green means the board has not been kiln dried and holds moisture above 19%. It is easy to cut and nail, but it shrinks as it dries and can twist, cup or check.
What is the actual size of a 4x4?
Green 4x4 stock is surfaced a little larger than dry stock, at about 3-9/16 in. x 3-9/16 in., and it settles toward 3-1/2 in. x 3-1/2 in. as it dries. Contact us if a specific dimension matters.
What does S4S mean?
S4S means surfaced on four sides. All four faces are planed smooth, so the post has square, consistent edges and no rough-sawn surface.
Can I bury it in the ground?
No. It is not pressure treated, so it will rot in ground contact or constant wet. Choose pressure treated lumber for buried posts and outdoor structures.