C&Btr Clear KD Douglas Fir 1" x 3" x LF S4S

Actual: 11/16" x 2-1/2" x LF

This is C and Better Clear Douglas Fir, kiln dried (KD) to reduce moisture content, and surfaced on four sides (S4S) for smooth, square edges. It is an appearance-grade lumber known for its fine grain, minimal knots, and clean finish, making it a popular choice for visible applications such as trim, paneling, fascia, and finish carpentry.

Because it is kiln dried, this lumber is more stable and less prone to shrinkage or warping than green material. Its strength, workability, and attractive appearance make it suitable for both professional projects and high-quality DIY work.

Lumber Grades and Definitions

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

• C&Btr: “C and Better” is an appearance-grade designation. It means the lumber is at least grade C (which permits only small, tight knots) and may include higher grades such as B or A. This grade is used where a clean, attractive finish is important, such as trim, siding, and decorative work.
• Clear: A quality descriptor that emphasizes the absence of visible defects such as knots, splits, or discoloration. “Clear” lumber has a uniform appearance and is often used in fine woodworking, paneling, and finish carpentry.
• Douglas Fir: The species of wood. Douglas Fir is known not only for its strength but also for its fine grain and attractive appearance. In clear grades, it is commonly used for trim, millwork, fascia, and other visible finish applications.
• KD: Abbreviation for “Kiln Dried.” Lumber dried in a controlled kiln environment to a specific moisture content. KD lumber is more stable, less prone to warping, and free from insects or mold, making it ideal for finish or appearance-grade applications.
• S4S: Abbreviation for “Surfaced Four Sides.” Indicates the lumber has been planed smooth on all four faces for consistent dimensions and a polished appearance. In appearance grades, S4S ensures the material is ready for installation or finishing.

⚠️ 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.