Lumber grading determines quality, appearance, and price. A board labeled #1 Common looks very different from FAS, and both are different from Select Structural. Understanding the grading system saves money by helping you buy the right grade for the job — you do not need furniture-grade lumber for shed framing, and you do not want construction-grade lumber in a visible bookcase.

Lumber Grades Explained

Two Different Systems

Softwood (pine, fir, spruce, cedar) and hardwood (oak, maple, walnut, cherry) use completely different grading systems. Softwoods are graded by structural capability. Hardwoods are graded by the percentage of clear (defect-free) wood in the board. Knowing which system applies prevents confusion at the lumber yard.

Softwood Grades (Construction Lumber)

Softwood grading is managed by agencies like the Western Wood Products Association (WWPA) and the Southern Pine Inspection Bureau (SPIB). The grades define structural strength, appearance, and allowable defects.

Structural Grades

Select Structural: The highest structural grade. Few knots, straight grain, maximum strength. Used for engineered applications where strength calculations are critical. Expensive and rarely needed for residential projects.

No. 1 (Construction Grade): Tight knots, minor defects allowed. Strong enough for all residential structural applications — deck framing, floor joists, rafters, headers, and load-bearing walls. The standard grade for framing lumber at home centers.

No. 2 (Standard Grade): Larger knots, some wane (bark edge), and minor splits allowed. Still structurally adequate for most residential framing. Most 2x4 and 2x6 studs at big-box stores are No. 2 or better. Cheaper than No. 1.

No. 3 (Utility Grade): Significant defects — large knots, splits, warp. Used for non-structural applications: blocking, bracing, and temporary supports. Not suitable for visible or load-bearing work.

Stud Grade: Specifically graded for vertical wall studs. Limited warp and bow. Available in standard stud lengths (92-5/8 inches for 8-foot walls).

Appearance Grades

For trim, paneling, and visible softwood applications:

C Select: Nearly clear, minimal defects. Suitable for window trim, crown molding, and fine carpentry. Also called “C and Better.”

D Select: Minor defects (small knots, slight color variation). Good for painted trim and cabinetry. Significantly cheaper than C Select.

#1 Common (Colonial): Small, tight knots. Popular for “knotty pine” paneling, shelving, and rustic projects where knots are decorative.

#2 Common (Sterling): Larger knots, some loose knots allowed. Budget shelving and utility applications.

What to Buy at the Home Center

The 2x4s, 2x6s, and 2x8s at Home Depot and Lowe’s are typically stamped “No. 2 and Better SPF” (Spruce-Pine-Fir). This is adequate for framing, workbench construction, and structural projects. Hand-pick boards for straightness and minimal defects — the quality within a grade varies enormously.

For trim and visible applications, buy “Select” or “Premium” grade from the moulding and millwork aisle.

Hardwood Grades (NHLA System)

The National Hardwood Lumber Association (NHLA) grades hardwoods by the percentage of clear (defect-free) cuttings obtainable from each board. This system determines how much usable wood a board yields for furniture, cabinet, and millwork applications.

FAS (First and Seconds)

The highest hardwood grade. Minimum 6 inches wide, 8 feet long. At least 83.3 percent clear cuttings. Both faces must meet FAS requirements.

FAS lumber is what furniture makers want — wide, long, clear boards with minimal waste. It commands a premium: 30 to 50 percent more than lower grades. Worth it when the project is visible and you cannot hide defects.

FAS One Face (F1F)

One face meets FAS quality; the other meets #1 Common. The good face goes outward on cabinet panels, tabletops, and furniture sides. The lesser face is hidden. This grade saves significant money (10 to 20 percent less than FAS) with no visible quality difference in most applications.

Select

Similar to FAS One Face but available in narrower and shorter boards (minimum 4 inches wide, 6 feet long). Good for smaller parts where width is not critical — door frames, drawer fronts, and trim.

#1 Common

Boards yield 66.7 percent clear cuttings. More knots, sapwood, and minor defects than FAS. Excellent for projects where you can cut around defects — short parts, narrow components, cutting boards (glued from short clear sections), and any project with small part requirements.

#1 Common is often the best value. You pay less per board foot and yield perfectly good clear lumber by cutting between defects. A skilled woodworker wastes less than 20 percent of #1 Common by planning cuts strategically around knots and defects.

#2 Common

Yields 50 percent clear cuttings. More sapwood, more defects. Used for rustic furniture, painted projects, small parts, and applications where character marks are desired.

Board Foot Pricing

Hardwoods are sold by the board foot (BF). One board foot equals a 12 x 12 x 1-inch volume. Calculate board feet: (thickness in inches x width in inches x length in feet) / 12.

Species	#1 Common ($/BF)	FAS ($/BF)
Red oak	$4-6	$6-9
White oak	$5-8	$8-12
Hard maple	$4-7	$7-10
Cherry	$5-8	$8-12
Walnut	$8-12	$12-18
Poplar	$3-4	$4-6

Prices vary by region, dealer, and market conditions. Local sawmills are typically 20 to 40 percent cheaper than retail hardwood dealers for the same species and grade.

Moisture Content

Lumber is sold as kiln-dried (KD) or air-dried (AD). Kiln-dried lumber is dried to 6 to 8 percent moisture content in an oven. Air-dried lumber reaches 12 to 15 percent through natural evaporation.

For indoor furniture and cabinetry, use kiln-dried lumber. The low moisture content matches indoor humidity levels and minimizes seasonal movement. Air-dried lumber in an indoor project shrinks as it acclimates to indoor humidity, causing joints to open and panels to warp.

For outdoor projects, air-dried lumber is acceptable since outdoor humidity is closer to the air-dried moisture level.

Check moisture with a pin-type moisture meter ($25 to $40) before starting any project. If the lumber is above 10 percent for indoor work, let it acclimate in the shop for 1 to 2 weeks before milling.

Selecting Boards at the Yard

Whether buying hardwood or softwood, inspect every board:

Sight down the length for straightness — reject bowed, twisted, or cupped boards
Check for checks (end cracks) and splits
Look for loose knots that may fall out
Feel for moisture — wet lumber is heavier and should not be used immediately
Check for warp types: cup (across the width), bow (along the length), twist (diagonal), and crook (edge bend)

At a hardwood dealer, you often select your own boards from the rack. This is an advantage — pick the straightest, clearest boards in the grade you are buying.

Bottom Line

Buy No. 2 or better softwood for framing and structural work. Buy Select or C and Better softwood for trim and visible applications. Buy FAS or F1F hardwood for furniture where wide, clear boards matter. Buy #1 Common hardwood when you can cut around defects — it is the best value in the hardwood yard. Always check moisture content and inspect every board before loading it in the truck.