#1 Green Douglas Fir 4" x 8" x LF S4S

Actual: 3-1/2" x 7-1/2" x LF

#1 Douglas Fir Green S4S is a high-quality structural lumber offering greater strength and fewer defects than #2 grade material. Milled from Douglas Fir and surfaced on four sides for smooth, square edges, it provides consistent dimensions and a clean finish. As green lumber, it contains higher moisture content, which makes it easier to nail but requires consideration for shrinkage as it dries.

This grade is commonly chosen for structural framing, beams, posts, and other load-bearing applications where added reliability is desired. With its strength, stability, and workability, #1 Douglas Fir Green S4S is a dependable option for both professional builders and demanding construction projects.

Lumber Grades and Definitions

A reference guide to the common grades and surfacing designations for this type of lumber.

• #1: A structural grade indicating stronger, higher-quality lumber than #2. Allows fewer and smaller defects while ensuring excellent performance for structural use.
• Douglas Fir: The species of wood. Douglas Fir is widely used for structural applications because of its high strength-to-weight ratio, dimensional stability, and workability. It is a dependable softwood for framing, beams, and heavy construction.
• Green: Describes the moisture content of the lumber. “Green” means freshly cut and not kiln-dried, so it contains higher moisture. Green lumber nails easily without splitting but should be used or allowed to dry promptly to avoid shrinkage or warping.
• S4S: Abbreviation for “Surfaced Four Sides.” Indicates the lumber has been planed smooth on all four sides for uniform dimensions and square edges. S4S lumber is easy to handle and ready for use in both construction and finish applications.

⚠️ WARNING: Drilling, sawing, sanding or machining wood products can expose you to wood dust, a substance known to the State of California to cause cancer. Avoid inhaling wood dust or use a dust mask or other safeguards for personal protection. For more information go to www.P65Warnings.ca.gov/wood.