BABA construction materials: what counts (and what doesn’t)

Build America, Buy America’s construction-materials category is easy to over-read. Desks treat “construction materials” as everything that is not steel. 2 CFR Part 184 does the opposite: it is a closed list, it uses an all manufacturing processes in the United States test, and it carves cement, aggregates, and aggregate binders out of the preference entirely.

This briefing is for buyers and suppliers who have to classify an item before the shop-drawing fight. Use the BABA / Buy America applicability check for a funding-type sketch, then read the award. It is educational, not legal advice and not official OMB or agency guidance. See BABA basics for infrastructure projects for the three-category map.

Construction materials are a closed list

Under 2 CFR 184.3, a construction material is an article, material, or supply that consists of only one of the listed items — except that minor additions of other articles, supplies, or binding agents do not change the category. If one listed item contains another listed item as an input, it is still a construction material.

The listed items are:

• Non-ferrous metals
• Plastic and polymer-based products, including polyvinylchloride, composite building materials, and polymers used in fiber optic cables
• Glass, including optic glass
• Fiber optic cable, including drop cable
• Optical fiber
• Lumber
• Engineered wood
• Drywall

That is the list. Paint, fasteners that are not themselves a listed item, a pump, a control cabinet, and a precast structure are not construction materials just because they show up on a jobsite. Classify those under iron or steel, manufactured products, or — if they qualify — section 70917(c). Do not invent a ninth construction-material noun.

2 CFR 184.4(e) says an article should fall into one category only: iron or steel products, manufactured products, construction materials, or section 70917(c) materials. Classification is made on the item’s status when it is brought to the work site for incorporation — generally the project location, not the mill or the warehouse.

The test is “all manufacturing processes,” not 55 percent

For construction materials, “produced in the United States” means all manufacturing processes for that material occurred in the United States. 2 CFR 184.6 is the process standard. There is no component-cost percent for a construction material.

That is the opposite of the manufactured-product rule. A manufactured product must be manufactured in the United States and the cost of components mined, produced, or manufactured in the United States must be greater than 55 percent of the total cost of all components, unless another law sets a higher bar for that award. Component cost lives in 2 CFR 184.5. The domestic content helper runs that arithmetic and the all-processes screens. It does not classify your item.

What 2 CFR 184.6 actually asks

Each listed material has its own process window. Except where the rule says otherwise, apply one standard to one construction material:

• Non-ferrous metals — initial smelting or melting through final shaping, coating, and assembly.
• Plastic and polymer-based products — initial combination of constituent plastic, polymer, or composite inputs until the item is in its final form.
• Glass — initial batching and melting of raw materials through annealing, cooling, and cutting.
• Fiber optic cable (including drop cable) — initial ribboning (if used) through buffering, fiber stranding, and jacketing. The rule also pulls in the glass and optical-fiber standards, but not the non-ferrous-metal or plastic/polymer standards.
• Optical fiber — initial preform fabrication through completion of the draw.
• Lumber — initial debarking through treatment and planing.
• Drywall — initial blending of mined or synthetic gypsum plaster and additives through cutting and drying of sandwiched panels.
• Engineered wood — initial combination of constituent materials until the wood product is in its final form.

A supplier who extruded PVC in the United States from imported resin, or planed lumber from imported cants, still has to walk the process window in 184.6 — not a 55 percent spreadsheet. A buyer who only asks “was it assembled here?” is asking the manufactured-product question.

How this differs from iron or steel

Iron or steel products are articles that consist wholly or predominantly of iron or steel or both. “Predominantly” in 2 CFR 184.3 means the cost of the iron and steel content exceeds 50 percent of the total cost of all components.

The production test is also all-processes, but the window is different: from the initial melting stage through the application of coatings. That is the mill-and-coat rule desks already know from FHWA 23 U.S.C. 313. A copper conductor is not iron or steel. Rebar is not a construction material. Do not run a drywall panel through the melt-and-coat test, and do not run a steel beam through 184.6.

Highway lettings can still be FHWA Buy America jobs and BABA jobs. Construction-material coverage is the piece older DOT statutes often lacked. See FHWA Buy America nonavailability waivers.

How this differs from manufactured products

A manufactured product, in 2 CFR 184.3, is an article that has been processed into a specific form and shape, or combined with other articles to create a product with different properties. If the item is already classified as iron or steel, a construction material, or a section 70917(c) material, it is not a manufactured product.

The practical split:

• Construction material — one item on the 184.3 list. Test: all manufacturing processes in the United States (184.6).
• Iron or steel product — wholly or predominantly iron or steel. Test: melt through coating in the United States.
• Manufactured product — processed or combined, and not in the other three buckets. Test: U.S. manufacture and greater than 55 percent domestic component cost (184.5).
• Section 70917(c) — cement, cementitious materials, aggregates, or aggregate binders. Outside the BABA preference unless another program says otherwise.

A manufactured product may contain construction materials, iron or steel, or 70917(c) materials as components. The 55 percent test then applies to the manufactured product as a whole, not to each input as if it arrived at the site alone. Classify at the work site, not in the bill of materials abstract.

The section 70917(c) carve-out

Section 70917(c) of the Build America, Buy America Act — restated in 2 CFR 184.3 — takes these items out of the construction-materials preference:

• Cement and cementitious materials
• Aggregates such as stone, sand, or gravel
• Aggregate binding agents or additives

Those are section 70917(c) materials. They are not construction materials. On their own they are also not manufactured products. Ready-mix, bagged cement, and pit-run aggregate do not pick up a BABA construction-material label just because they are incorporated into infrastructure.

They can still appear inside a manufactured product (a precast unit, a treated assembly) once they have been combined and brought to the site as that product. The preference then follows the manufactured-product test, not 184.6. Other program rules — State specs, agency-specific domestic preferences — can still apply. Read the award. Do not assume “cement is always free of every domestic preference.”

What buyers and suppliers should check

Before you write a spec note, a bid exception, or a waiver request, walk the item — not the CSI division.

• Funding. Federal financial assistance for an infrastructure project in the United States is the BABA on-ramp. Direct FAR procurement is a different statute. The applicability tool sketches the regime; the assistance agreement controls.
• Category at the work site. One of four: iron/steel, manufactured product, construction material, or 70917(c). Not two. Not “construction materials” as a synonym for the jobsite pile.
• If it is on the 184.3 list. Apply the matching 184.6 process window. Ask where smelting, batching, preform, debarking, or gypsum blending happened — not only where the truck loaded.
• If it is iron or steel. Melt through coating. Predominantly iron/steel is a cost test (>50 percent of component cost), not a vibe.
• If it is a manufactured product. U.S. manufacture plus the 55 percent component-cost math in 184.5. Keep invoices and a good-faith iron/steel content estimate if the item is close to the “predominantly” line.
• If it is cement, aggregate, or an aggregate binder. Treat it as 70917(c) unless the award or another statute says otherwise. Do not force it into 184.6.
• Waivers. Agencies can still waive construction materials for public interest, nonavailability, or unreasonable cost through the Made in America process. A proposed waiver is a chance for a domestic producer to show supply. See how Buy America waivers work and how a waiver desk helps suppliers. The comment-deadline countdown and batch helper count Eastern Time calendar days; they do not replace the cutoff on the notice. The keyword note builder is for one-off research strings, not a filing.

Buyers: put the preference in the bid documents, flow it to subcontractors, and classify before procurement locks a foreign mill. Suppliers: know whether you sell a listed construction material or a manufactured product, and keep process or component-cost records that match the test you are actually under.

None of this is a coverage opinion. Confirm 2 CFR Part 184, the agency’s implementing guidance, and the award clause. The articles are background. The tools hub is arithmetic. A Flagcup desk emails the official notice when a matching waiver posts.

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