Two identical roofing tiles — one steel, one clay — file in two different trademark classes purely because of what they're made of. That's the entire logic of Nice Class 19: it's the non-metal mirror of Class 6, covering lumber and timber, cement and concrete, stone, brick, ceramics and tiles, building glass, asphalt, and non-metal pipes and prefabricated components. Anything metal doing the same structural job belongs in Class 6 instead.
| Material | Class |
|---|---|
| Wood, concrete, stone, ceramic building products | 19 |
| Steel, aluminum, metal building products | 6 |
| Construction, installation, repair services | 37 |
| Building glass (windows, facades) | 19 |
| Household glassware | 21 |
Goods Versus Services: The Line That Actually Trips People Up
The material distinction is the obvious one; the one that catches more brands off guard is goods versus services. Building materials are Class 19 (non-metal) or Class 6 (metal) as physical products. The act of construction, installation, or repair is an entirely separate registration in Class 37. A company that manufactures roofing tiles and also installs roofs needs both Class 19 and Class 37 — filing only one leaves either the product or the service side of the business unprotected, and this is a genuinely common gap for building-products companies that grew from a manufacturing operation into an installation one, or vice versa.
The Full-Line Building Brand
Companies with a broad building-products catalog often end up filing across all three corners of this triangle — Class 6 for anything metal, Class 19 for anything non-metal, Class 37 for any installation or repair service — because their actual business spans all of it. Our Class 6 guide covers the metal side and our Class 37 guide covers the services side of this same relationship. A smaller detail worth flagging: rigid non-metal pipes for building are Class 19, but flexible non-metal pipes and hoses are actually Class 17, and rigid metal pipes are Class 6 — piping manufacturers in particular may need to file across three classes rather than one.
Class 19 is largely a B2B, trade-focused category — sold to builders, contractors, and distributors rather than consumers — so brand names tend to be coined or arbitrary and descriptiveness refusals are comparatively rare, though generic geographic names like "Quality Lumber" still get refused for the same reasons descriptive names always do.
Prefabricated Structures: A Category That Splits Three Ways
Prefab and modular building components deserve their own callout because they sit at an unusually complicated junction. A non-metal prefabricated building or building section — a modular home shell, a prefab wall panel — is Class 19 as a building material in its own right. But the moment that same company also handles the on-site assembly and installation, that service work is Class 37, not Class 19, regardless of how integrated the sale feels to the customer buying a "turnkey" prefab home. And if the structure incorporates significant electronics or smart-home wiring sold as part of the package, a further Class 9 filing may be warranted for that component. Modular-building companies in particular tend to under-file here because their business genuinely reads as a single product to the customer, even though it's legally three separate categories of goods and services.
Why Descriptive Refusals Still Happen in a B2B Class
Even though Class 19 is dominated by trade buyers rather than retail shoppers, descriptive refusals aren't rare here the way they might be expected to be — they just take a different shape. Rather than "Cool Air Systems"-style consumer-facing genericism, the Class 19 version usually looks like a material name plus a quality claim: "Premium Concrete," "Strong Lumber," "Best Brick." Examiners treat these the same way regardless of audience sophistication, because the legal test is whether the mark merely describes a characteristic of the goods, not whether the buyer is a contractor or a homeowner. A geographic descriptor stacked on top of a generic material term — "Texas Lumber Co." for an actual Texas-based lumber company — compounds the problem, since geographic descriptiveness and generic material descriptiveness reinforce rather than offset each other in an examiner's analysis.
Search registered Class 19 trademarks before you file, and settle your Class 6 / 19 / 37 filing strategy up front if your catalog spans both materials and installation services.