Freight Class for Lumber
A tight unit of lumber is almost solid wood, so it rates close to the wood's own density, usually freight class 55 to 65. A unit of 294 eight-foot 2x4s at 30 lb per cubic foot weighs about 2,573 lb and measures 30 lb/ft³, right on the class 60 line. Panels are denser: 70 half-inch AdvanTech panels measure about 41 lb/ft³, class 55. Most lumber is 8 feet or longer, so expect a length charge on LTL.
A lumber unit is nearly solid wood
The American Wood Council's design tables give the weight per foot of each lumber size at densities from 25 to 50 lb per cubic foot. A 2x4 weighs 0.911 lb per foot at 25 lb/ft³ and 1.094 lb at 30 lb/ft³, so an 8-foot 2x4 weighs about 7 to 9 lb, depending on the wood.
Distributors sell 2x4s in units of 294 pieces, for example 14 across and 21 high. Packed that tight, the unit is almost all wood, so its density is simply the wood's density: about 30 lb/ft³ (class 60) for wood at that weight, or 25 lb/ft³ (class 65) for lighter wood. The Southern Pine Inspection Bureau and University of Wisconsin Extension both stress that moisture changes the weight a lot, even within one species.
Worked examples
Weights per foot come from the American Wood Council's design tables, panel weights from Huber, and unit counts from distributors and Huber.
Unit of 294 2x4s, 8 feet — class 60
294 pieces at 1.094 lb per foot (30 lb/ft³ wood): about 2,573 lb in a block 49 × 31.5 inches by 8 feet.
49 × 31.5 × 96 = 148,176 in³ ÷ 1,728 = 85.8 ft³. Density = 2,573 lb ÷ 85.8 ft³.
30.0 lb/ft³ → class 60, right at the line; lighter wood rates class 65. Add the 8-foot length charge.
Unit of 70 AdvanTech panels — class 55
70 half-inch 4 × 8 panels at about 55 lb each: 3,850 lb, 35 inches high.
48 × 96 × 35 = 161,280 in³ ÷ 1,728 = 93.3 ft³. Density = 3,850 lb ÷ 93.3 ft³.
41.2 lb/ft³ → class 55.
Sheet goods
Huber publishes the weights of its AdvanTech panels: a ½-inch 4 × 8 sheathing panel weighs about 55 lb and comes 70 to a unit; a 23/32-inch subfloor panel weighs about 72 lb and comes 45 to a unit. Weyerhaeuser lists its OSB floor panels at 2.0 lb per square foot for 19/32-inch and 2.4 lb for 23/32-inch.
A unit of 70 half-inch AdvanTech panels is 3,850 lb in a block 4 × 8 feet and 35 inches high, about 41 lb/ft³, class 55. Like drywall, a 4 × 8 unit is 8 feet long, which adds a length charge at many LTL carriers ($460 at XPO, $375 at FedEx Freight).
Handling and storage
APA, the engineered wood association, says panels should go on pallets or bunks before a forklift moves them, be covered with a tarp on open trucks, and have their ends and edges protected, especially tongue-and-groove panels. It also says to store panels under a roof, and to cut the steel bands on a bundle if it may take on moisture, to avoid edge damage.
For exports, note that pallets made of engineered wood such as plywood are exempt from the ISPM 15 rules for wood packaging, as Georgia-Pacific points out; solid-wood pallets must be treated and marked.
Check your lumber unit
Enter the unit's length, width and height and its weight. Lumber weight changes with moisture, so weigh the real unit if you can.
Density-based estimate. Some commodities carry a fixed NMFC class — check our freight class by commodity pages.
Estimated Freight Class
Density
42.51
lb/ft³
Volume
53.33
ft³
Weight
2,267
lb
35–50 lb/ft³ → Class 55
NMFC density scale (Docket 2025-1, effective July 19, 2025)
Free PDF includes a watermark. Pro removes it & adds your brand.
Estimates only — verify freight class/NMFC and chargeable weight with your carrier.
Uses the 13-tier NMFC density scale (Docket 2025-1). See the full freight class chart.
Frequently asked questions
What freight class is lumber?
Usually class 55 to 65. A tight unit of lumber is almost solid wood, so its density is about the wood's own, 25 to 40 lb per cubic foot.
How much does a 2x4 weigh?
An 8-foot 2x4 weighs about 7.3 lb at 25 lb/ft³ wood and 8.8 lb at 30 lb/ft³, based on the American Wood Council's weight per foot. Wet wood weighs more.
How many 2x4s are in a unit?
Distributors commonly sell 2x4 units of 294 pieces.
How much does a sheet of OSB or AdvanTech weigh?
Huber lists ½-inch AdvanTech sheathing at about 55 lb per 4 × 8 panel and 23/32-inch subfloor at about 72 lb. Weyerhaeuser lists 23/32-inch OSB at 2.4 lb per square foot.