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6" x 6" Utility/#3 Grade Green S4S Fir Dimensional Lumber
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6" x 6" Utility/#3 Grade Green S4S Fir Dimensional Lumber
This is a 6x6 in Utility/#3 grade fir, sold green and surfaced smooth on all four sides (S4S). It is a heavy timber size in 8 and 10 ft lengths, used for landscape work, forming, bracing and general-purpose jobs.
Utility grade is an economy grade, not structural 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 check or twist as it dries. For structural posts and beams, choose a #2 and better 6x6 and confirm what your building inspector requires.
Features and Common Uses
- Utility/#3 grade fir, an economy grade that keeps the cost of 6x6 timber 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 6 in. nominal section is stout enough for heavy stakes, blocking and short posts
- Not pressure treated, so keep it dry and out of ground contact
Commonly used for:
- Heavy blocking, cribbing and temporary supports
- Concrete forming, shoring and bracing
- Landscape timbers, steps and raised edging in dry, above-ground use
- Rustic posts and decorative timber work where strength is not critical
Specifications
| Product | 6x6 Utility/#3 Fir, Green, S4S |
|---|---|
| Species | Fir |
| Grade | Utility/#3 |
| Nominal size | 6 in. x 6 in. |
| Actual size, green | About 5-5/8 in. x 5-5/8 in., shrinking toward 5-1/2 in. as it dries |
| Available lengths | 8 and 10 ft |
| Moisture content | Green, above 19% |
| Surfacing | S4S, surfaced on four sides |
| Pressure treated | No |
Grade, species and moisture marks are stamped on each piece and are the governing record for what 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 or beams?
Not for structural or load-bearing posts or beams unless your building inspector or engineer accepts it. Utility is graded below No. 2 and Standard. Use a #2 and better 6x6 for deck, porch and carport posts, and keep Utility/#3 for cribbing, forming and general work.
What does green lumber mean?
Green means the timber 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 check, twist or cup.
What is the actual size of a 6x6?
Green 6x6 stock is surfaced a little larger than dry stock, at about 5-5/8 in. x 5-5/8 in., and it settles toward 5-1/2 in. x 5-1/2 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 timber 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.