Shipping Lumber Freight Class Guide
Lumber typically classify around Class 60, in the 25-35 lb/ft³ density range. Bundled dimensional lumber.
Calculate Lumber Freight Class
Enter your actual shipment dimensions and weight below. Typical lumber run 2,000-3,500/bundle lb, but your exact class depends on your specific shipment's measured density.
Measure the full footprint including packaging, and include pallet weight in your total. Carriers will re-measure at the terminal.
Shipping Lumber the Right Way
Flatbed, Not Dry Van
Lumber almost always moves on flatbed or step deck rather than dry van, both for loading practicality with a forklift and because bundled lumber doesn't need an enclosed trailer the way finished goods do.
Weather Protection Still Matters
Even though lumber ships on open equipment, tarping protects against rain and UV exposure that can warp or discolor boards, which matters more for finish-grade lumber than construction-grade framing stock.
Weight, Not Class, Drives Planning
Because lumber runs dense and heavy, a full flatbed load often hits legal weight limits before it hits the trailer's physical capacity, so dispatch plans lumber loads around axle weight distribution more than cubic space.
Lumber: What Carriers and Shippers Look For
Lumber is about as far from a typical freight-class conversation as building materials get: it's dense, heavy, and ships almost exclusively on flatbed rather than dry van, so the freight class conversation matters less than load securement, weather protection, and weight distribution. Bundled dimensional lumber runs dense enough to land in one of the cheapest classes on the table, but the practical challenges of hauling it are all about the equipment and the tie-down, not the paperwork.
Why Lumber Classifies Around Class 55
Bundled dimensional lumber typically runs 25 to 35 pounds per cubic foot, dense enough to land in the Class 55 to Class 60 range, among the cheaper end of the freight class table. In practice, though, lumber shipments are rarely priced by classified LTL rates the way boxed retail goods are. Most lumber moves as full truckload flatbed freight, where the class matters mainly for occasional LTL moves or for insurance and documentation purposes rather than day-to-day rate negotiation.
Load Securement and Weather Protection
Lumber bundles need proper chain or strap securement rated for the load weight, along with edge protection where straps cross bundle corners to prevent damage to the outer boards. Most carriers running lumber regularly keep dedicated tarps on hand, since even construction-grade lumber can warp or stain from prolonged rain exposure during a multi-day haul.
Weight distribution across the trailer's axles matters as much as securement itself, since a poorly distributed lumber load can put a truck over its legal axle weight even when the total load is under the trailer's rated capacity.
Equipment and Handling Notes
Flatbed and step deck dominate lumber freight, since loading and unloading with a forklift or overhead crane is far more practical on open equipment than through a dry van's rear doors. Carriers running building-materials freight regularly tend to carry the chains, straps, and tarps needed for lumber as standard equipment rather than sourcing them load by load.
Common Shipping Mistakes
The most common mistake is treating lumber like standard dry van freight and underestimating the securement and weather protection it actually needs on open equipment. The second is overlooking axle weight distribution, since lumber's density means a visually half-empty flatbed can already be at or near its legal weight limit.
Related Building Materials
Carriers Hauling Lumber
“Lumber runs are all about the tie-down. I've never had a class issue, but I've seen loads shift because someone rushed the chains.”
“Weight distribution catches new flatbed drivers off guard on lumber loads. The trailer looks half-empty but you're already near your axle limit.”