Buying Steel Building Materials: Lessons Learned From Metal Grating, Stair Systems, and Bulk Siding Orders

I've been handling purchasing for steel building materials and fabricated metal components for the past eight years. I've personally made and documented six major order mistakes that totaled roughly $31,000 in wasted budget. I keep that list on my desk, not to feel bad, but to stop the same errors from happening again.

This article isn't a sales pitch. It's a set of questions I now use before buying metal grating, stair systems, siding, and similar steel building materials. If you can learn from my rework instead of paying for your own, that's a win.

Questions I'll answer:

• What should I look for in a stair systems supplier?
• What does a metal grating order really need?
• Does private label mean lower quality steel building materials?
• What goes wrong with bulk metal siding?
• Is McNichols steel just a middleman?
• What do I check before every order now?

1. What should I look for in a stair systems supplier?

Price and lead time are easy to compare, so those get most of the attention. The problem is that two stair system quotes can look identical and still be completely different projects.

Back in 2017, I approved a stair package mainly because the bid was $6,200 lower than the next one. Later, the field inspector asked for load data on the guardrails. The supplier sent a generic catalog sheet instead of project-specific calculations. We paid a local engineer $1,850 to review and stamp the shop drawings, then waited nine days for the correction. The low price wasn't low. It was just incomplete.

If you're asking what to look for in a stair systems supplier, ask these three questions before you commit:

• Do you provide project-specific shop drawings, not just catalog details?
• Can you confirm compliance with the applicable code? I usually reference OSHA 1910.25 for fixed industrial stairs or IBC Chapter 10 depending on the building type.
• Will the stair treads and landings work with the floor plate or grating I've specified?

A good supplier should ask about your site conditions, load requirements, finish, and code jurisdiction before cutting steel. If they don't ask, they're selling boxes, not systems.

2. What does a metal grating order really need?

The word grating hides a lot of complexity. There is welded bar grating, pressure-locked grating, swage-locked grating, aluminum grating, stainless steel grating, serrated grating, plain grating, and dozens of bar spacing combinations. A panel size alone is meaningless.

In 2018, I ordered welded steel grating for a maintenance platform. I specified length, width, and quantity, but I didn't specify bearing bar direction. In my mind it was obvious. When the panels arrived, the bearing bars ran the wrong way relative to the supports. The fabricator hadn't made an error; I had created ambiguity. We paid an extra $1,200 to rework the supports instead of spending five minutes on the PO.

That's why I now treat metal grating like a structural component. At minimum, I provide:

• Bearing bar depth and thickness, e.g. 1-1/2 x 3/16 inches.
• Bearing bar spacing and crossbar spacing.
• Clear span or support location.
• Required load or allowable deflection.
• Material, finish, and whether galvanizing is done after fabrication.
• Cutout requirements and edge banding.

If a supplier can't provide load data or reference the NAAMM Metal Bar Grating Manual (ANSI/NAAMM MBG 531), I don't use them for structural applications.

3. Does private label mean lower quality steel building materials?

No. Private label in steel building materials isn't the same as buying a grocery store brand. It's a supply arrangement where a distributor, fabricator, or manufacturer produces material that carries your brand, your item number, or your company's documentation system.

I used to think private label was only for retail products. Then our team started exploring a steel building materials private label strategy for an OEM customer who didn't want a third-party name appearing on their submittals. What surprised me was not the quality but how much specification detail had to be locked down before the first order.

Private label support only works when the buyer knows exactly what they are specifying. You need agreed tolerances, finish requirements, testing or certification requirements, packaging rules, and a clear process for non-conforming material. If you don't define those things, private label simply becomes a way to hide material substitutions until it's too late.

4. What goes wrong with bulk metal siding?

Bulk metal siding orders can save a serious amount of money per square, but the savings disappear fast when field crews are waiting on missing trim or the wrong coating class.

In 2022, we ordered 16,000 square feet of 26 gauge painted steel wall panels. The price per square was great. The contract specified galvanized steel, but we didn't put the coating class in the PO. The supplier sent panels with G60 coating when the project spec required G90. An inspector caught it after panels had already been staged across the site. That setback cost us one week of schedule and extra freight.

Bulk metal siding quotes should always confirm three things:

• Exact profile and coverage width, because accessories and flashings are profile-specific.
• Steel substrate and coating class, not just the word galvanized.
• Color, finish system, and traceability for touch-up and future repairs.

The irony is that a complete bulk siding order doesn't require much extra paperwork. It just requires the seller and buyer to use the same precise language.

5. Is McNichols steel just a middleman?

No, but don't expect a service center to fix a poorly written specification either.

A full-line supplier like McNichols functions as both a distributor and a fabricator. They stock metal products, cut them, process them, and often provide technical guidance. In practice, McNichols steel and metal product orders can be a good option when you need grating, perforated panels, expanded metal, stair treads, handrail components, and siding in one consolidated order. The value isn't always a lower price per pound. The value is fewer freight bills, fewer document gaps, and one supplier who can answer questions before production.

One thing I've learned from quoting metal products through McNichols is to search the catalog for a McNichols grating style or product code and use that exact reference on the RFQ. Don't write just steel grating. Write the product code, the bar spacing, the material, and the finish. A service center can only help you if you give them usable information.

6. What do I check before every steel building material order now?

After enough expensive surprises, I built a checklist. It sounds boring, but it catches real problems before they become field delays.

• Exact product identification, including profile, item code, and ASTM or other applicable standard.
• Quantity in units, plus a second check of total square footage or linear footage.
• Finish and coating class, including whether galvanizing happens before or after fabrication.
• For metal grating, every structural detail: bearing bar depth, thickness, spacing, and support span.
• For stair systems, the code reference, handrail load criteria, and connection requirements.
• For siding, the panel coverage, side lap/end lap, trim schedule, and accessories.
• Certs and submittals required, such as mill test reports, coating certifications, and shop drawings.
• Delivery and unloading constraints, especially when panels are long or crated.

It's not about making procurement feel complicated. It's about catching predictable mistakes while they are still cheap. Five minutes of verification has saved me far more than five days of correction.