McNichols Plank Grating or McNichols Mesh? A Quality Inspector's Guide to Choosing the Right Spec
If you're trying to choose between McNichols plank grating and McNichols mesh, here's the honest answer: it depends. Not because I'm dodging the question, but because I've seen both product families work brilliantly in one place and fail in another. I'm a quality compliance manager at an industrial materials distributor. I review every product submittal before it reaches a customer—roughly 600 items a year. I've rejected 11% of first deliveries in 2024 because the spec didn't match the application. And in almost every case, the rejection could have been avoided with one good pre-order conversation.
This guide is written from the quality side, not the sales side. I do not care which SKU leaves the warehouse. I care that the thing under someone's boots doesn't flex, corrode, or drop debris on whatever is below it.
The real choice is not “grating vs. mesh”
If you look at McNichols mesh and McNichols plank grating side by side, both seem like “metal with holes.” But they're not interchangeable. Plank grating is built to carry load over a span. It has bearing bars—usually steel, aluminum, or fiberglass—with openings that let water and debris fall through. You use it for walkways, trench covers, mezzanine floors, and platforms over equipment.
Mesh is a wider category: welded wire mesh, woven wire mesh, expanded metal, and perforated panels. It's for guards, partitions, screens, cages, and infill panels. Some mesh products can be engineered as a walking surface—actually, that's not quite right. They can be if they're framed and rated as a structural panel. But that's the exception, not the rule.
So before you choose, you need to answer one question. What is the worst thing that happens if the product fails?
That sounds dramatic, but it's the right filter. If failure means someone falls through a platform, you're in the plank grating world. If failure means someone reaches through an opening and gets hurt, you're in the mesh world. If failure means a small wrench drops onto a production line below, you're in a third world that a lot of people get wrong.
Scenario A: Load-bearing walkway or trench cover
This is the main job of McNichols plank grating. It's designed for pedestrian access, maintenance platforms, drainage trenches, and heavy-duty industrial walkways. Because it has structural bearing bars, it can span between supports and carry much higher loads than standard mesh.
When I compared our Q1 and Q2 order files side by side—same product family, different jobs—I finally understood why the details matter more than the material grade. A 2-inch bar spacing might be fine for a light-duty loading dock. Put the same product in a forklift aisle, and it'll flex under the wheel load. The load table is not a suggestion.
The objection I get most often is: “It's just a grating, what is there to check?” Actually, a lot. The checklist I use for plank grating looks like this:
- Bearing bar depth and thickness
- Bearing bar spacing
- Serrated vs. smooth surface
- Edge banding and cutouts
- Load and deflection per NAAMM MBG-534
- Material type and coating
If you skip the load check, you're not saving time. You're deferring it to the day after installation.
The 12-point checklist I created after my third mistake has saved us an estimated $22,000 in potential rework. I don't think that's an exaggeration. That number is from one rejected order alone.
When would mesh ever be the right walking surface?
If the surface is framed and the mesh is engineered as a structural panel, some expanded metal and welded wire mesh products can work for light-duty access. But in my experience, that's rare. Most failures I've reviewed happened because someone used a mesh panel as a shortcut around ordering real grating. It happened to me in 2022. I approved a heavy expanded metal panel as a temporary platform because it was in stock. It held, but the vibration was wrong—every step felt like walking on a speaker cone. We replaced it with serrated plank grating before it became an incident report.
I only believed “check deflection before you approve” after ignoring that warning once. That was my one free lesson.
Scenario B: Security screening, guarding, or containment
McNichols mesh is the right starting point when you're not asking the material to carry a load. You're asking it to hide an opening, keep people out, stop parts from moving, or let airflow happen while maintaining visibility.
The challenge is that “mesh” is a small word for a huge family. Welded wire mesh has square openings and rigid joints. Woven wire mesh is more flexible and usually finer. Expanded metal is made by slitting and stretching sheet metal, so it has diamond-shaped openings and no separate wires to break. Perforated metal is stamped or punched, so it gives you round holes, square holes, slot holes, decorative patterns, and a wide range of open areas.
And here's where the quality inspector in me gets loud: the product category is less important than the opening size and wire diameter.
For security partitions, smaller openings are better, but they also reduce airflow and visibility. For machine guarding, you need to comply with relevant safety standards for reaching hazards. For containment, you might need a tight enough mesh to hold small parts while still letting cutting fluid drain. You can't decide that by looking at a photo on a website.
I ran a blind test with our engineering team in 2023: same panel size, same frame, but one side welded wire mesh and the other side perforated metal. 73 percent of the team chose the perforated panel as “more professional” without knowing which was which. The cost difference was meaningful on a 200-panel order. But that didn't make the welded wire mesh the wrong choice—it made the perforated panel the right choice for a customer-facing installation.
This is the part I have to remind myself every time: our preferences don't matter. The environment, the hazard, and the maintenance plan decide.
Scenario C: Drainage plus small-object containment (the one most people get wrong)
Here's the contrarian take. If your project involves drainage over an occupied area, you might not want traditional bar grating at all. A standard plank grating with 1-inch or larger openings lets water through, yes. It also lets a screwdriver, a bolt, a box cutter, a coin, or a piece of scrap metal through.
I only noticed this after our own maintenance team dropped a small hand tool through a parking garage trench grate. It was a $90 wrench. It fell onto the drainage sump below, we got it back, and everyone laughed. Then I thought about what happens when it's not a wrench but a screwdriver falling onto a worker in a pit. That's not a funny story anymore.
If the space below a drain or walkway is occupied by people, equipment, or a food production line, you need a two-layer approach: structural support underneath, and a small-opening screen or mesh on top. Or you need a perforated panel engineered for the load. This is not a common recommendation, and it costs a bit more. It's also the only way I know to get drainage and debris containment without making the surface a slip hazard.
This approach works for us because our facility has predictable access and we can control maintenance. If you're building a public plaza where someone will park a delivery truck or drive a maintenance vehicle over the surface, the calculus is different. You have to design for the heaviest vehicle, not the cleanest story.
How to tell which scenario you're in
You might be reading all three scenarios and still feel unsure. Let me give you a quicker path. Answer these five questions in order:
- Is the product going to be walked on or driven over? If yes, start with load-bearing plank grating or an engineered structural panel. Do not start with wire mesh.
- Is the space below the product occupied or sensitive? If yes, add a small-opening layer or choose a perforated panel. This overrides almost everything else.
- Do you need to see through the product? If yes, look at welded wire mesh, woven wire mesh, or expanded metal with high open area.
- Is the environment corrosive or chemical-heavy? If yes, consider McNichols fiberglass grating or stainless steel options before carbon steel.
- Does the aesthetic matter? If yes, treat perforated metal and decorative mesh as a separate choice, not an afterthought.
If you reach the end of that list and still can't choose, you probably need a structural engineer to review the load path. I know that sounds like the expensive answer. It's not. I've seen a $22,000 redo happen because nobody checked whether a trench cover could handle a scissor lift. The engineering review for that would have cost about $400.
As of Q1 2025, McNichols offers both plank grating and mesh options cut to size at their service centers, with different materials, finishes, and bar spacings. Lead times and minimums change, so verify current stock before you finalize a schedule. And if someone tells you “no one checks this stuff,” smile, ask for it in writing, and then check it anyway.
That last bit might sound like a joke. It's not. The whole reason I write these guides is because I'm the person who sees the products after they've been specified and before they're installed. A 5-minute verification beats a 5-day correction. Every time.
