NMFC lookup/Category guide
Building materials freight classes and NMFC guide
Building materials are usually dense and stable, which makes them easier to classify than furniture. The trap is shipping partial units, mixed loads, or material that is wet, wrapped, or bundled differently from the norm.
Reviewed November 11, 2026 · Reference 2026.11 · 4 commodity guides
At a glance
What changes the class inside this category.
The class is not set by the category name. It is set by the form, packaging, and handling unit of the specific commodity. These are the variables that move a shipment between tiers.
4
commodity guides
4
density-rated
0
mixed or item-specific
What to watch
- Bundled, banded, and palletized units have different dimensions and weights.
- Moisture-sensitive material may need wrap that adds cube.
- Mixed loads may rate at the highest class in the shipment.
Start with the document, not the class. The NMFC item controls the description and any special provision. Confirm it in ClassIT+ or with the carrier, then measure the handling unit.
How to find an NMFC codeCommodity · basis · density · class span
4 entries
| Commodity | Basis | Typical density | Class span | Risk |
|---|---|---|---|---|
| Drywall Drywall is heavy, brittle, and usually shipped in large flat units. Density is high and stable, so the class is rarely a surprise — but damage and handling are. | Density | 40–55 lb/ft³ | Class 50–55 | Low |
| Insulation Insulation is extremely light for its cube, so it usually lands in the most expensive density tiers. Compression and packaging are the difference between a full load and a costly one. | Density | 0.7–2 lb/ft³ | Class 250–400 | Medium |
| Lumber Lumber is dense and stable, so density is rarely the hard part. The classification question is usually the species, grade, treatment, and whether the load ships as loose boards, a bundle, or a unit. | Density | 25–40 lb/ft³ | Class 55–65 | Low |
| Plywood Plywood is dense and ships in flat, stackable units. Density is stable, but the number of sheets per unit and the way the unit is banded can change the measured cube. | Density | 30–45 lb/ft³ | Class 55–60 | Low |
Class spans are derived from the endpoints of each typical density estimate. A measured shipment returns one class. Methodology & sources.
Turn it into a number
Measure the shipment, not the category.
Use the freight class calculator for the density math, the pallet calculator for the finished handling unit, and the linear feet calculator for trailer floor space.
Related categories
Keep browsing.
Furniture & fixtures
Furniture is one of the hardest categories to classify because the same item can ship assembled, knocked down, or nested. Density, packaging, and whether the carrier can stack the handling unit usually decide the class.
Browse category →Appliances & electronics
Appliances and electronics are bulky relative to their weight, so density usually lands in the middle of the scale. The packaging — foam, crates, and pallets — often matters more than the product itself.
Browse category →Metals & hardware
Metals and hardware are dense, so they usually sit at the low end of the class scale. The classification question is less about density and more about the exact form: plate, bar, extrusion, coil, or finished part.
Browse category →Category notes
One category, several density stories.
The table is a starting point. The detail page for each commodity explains what drives the density, how to measure it, and what to confirm before booking.
Corrections: hello@freightclasshub.com