McNichols Grating: How to Choose the Right Type for Your Project (A Decision Tree Approach)

There's No 'Best' Grating—Only the Right One for Your Job

I've been in quality control long enough to know the most common mistake buyers make: assuming one type of grating fits all. A contractor once ordered heavy-duty steel grating for a rooftop walkway because 'it's the strongest.' That added thousands in structural reinforcement costs they didn't need.

McNichols offers aluminum, fiberglass, steel, and even specialty grating. The question isn't which is 'best'—it's which fits your load, environment, and budget. Let's break it down into three common scenarios.

Scenario A: You Need Lightweight & Corrosion-Resistant for Outdoor or Wet Areas

If your project involves a boardwalk, platform, or catwalk exposed to rain, chemicals, or saltwater, fiberglass grating is often the smart choice. It won't rust, it's non-conductive, and it's about 1/4 the weight of steel.

I went back and forth between aluminum and fiberglass for a coastal pier project last year. Aluminum offered strength, but fiberglass was more cost-effective for the saltwater exposure. We ultimately chose fiberglass because the maintenance savings over 10 years justified the upfront cost. According to McNichols catalog, fiberglass grating is available in I-6000 and I-8000 series, with different resin systems for specific chemical resistance (Source: mcnichols.com, 2024).

Key specs to check:

• Load capacity—verify against your expected live load (e.g., 100 psf for pedestrian)
• Resin type—vinyl ester for high chemical resistance, polyester for standard uses
• Fire rating—check if your project requires Class 1 per ASTM E84

Scenario B: You Need High Load Capacity for Industrial Floors

For manufacturing plants or heavy equipment platforms, steel or aluminum grating is the go-to. Steel offers the highest load capacity per dollar, but it's heavy and requires galvanizing or painting for corrosion protection. Aluminum is lighter and naturally corrosion-resistant, but more expensive.

The decision between steel and aluminum kept me up at night for a 20,000 sq ft industrial floor project. On paper, steel was stronger. But my gut said aluminum would reduce installation costs and future maintenance. Hit 'confirm' on an aluminum order and immediately thought 'did I make the right call?' Didn't relax until the first test load passed inspection.

McNichols' aluminum grating comes in smooth or serrated surfaces for slip resistance. Steel grating includes standard welded, press-locked, and swage-locked options. Check bend strength tables in the catalog to match your required loading—typically in the 200-500 psf range (Source: mcnichols.com grating load tables, 2024).

Quick comparison:

• Steel: Max load, heavy, needs maintenance—ideal for heavy manufacturing
• Aluminum: 30-40% lighter, corrosion-resistant, moderate load—good for platforms
• Fiberglass: Lightest, non-corrosive, non-conductive—best for wet/chemical areas

Scenario C: You Need a Budget-Friendly Solution for Light-Duty or Temporary Use

If the project is temporary, residential, or light-duty (e.g., a garden bridge, small mezzanine), fiberglass or aluminum grating may still be appropriate, but there's a cheaper option: light-duty steel or even plank grating.

Most people assume you need thick grating for any walkway. The truth is, many light-duty applications require only 1/4-inch bearing bar depth. Using a heavy-duty product for a light-duty job wastes money and adds unnecessary weight. I've rejected first deliveries from contractors who spec'd heavy-duty steel for a temporary staging area—it cost them a $22,000 redo and delayed their launch by 3 weeks.

What to check for light-duty:

• Load requirement: pedestrian traffic (40-60 psf) vs. occasional vehicle
• Span: shorter spans allow thinner grating, saving material cost
• Finish: painted steel for indoor temporary use is fine; don't over-spec galvanized

McNichols' plank grating is a good candidate here—it's lighter and cheaper than structural grating but still rated for light industrial use (Source: mcnichols.com plank grating specs, 2024).

How to Know Which Scenario You're In

Here's a quick checklist to narrow it down:

1. Environment: Wet or chemical exposure? → Scenario A. Dry indoor? → Scenario B or C.
2. Load requirement: Heavy machinery (200+ psf) → Scenario B. Pedestrian only (100 psf or less) → Scenario A or C.
3. Budget sensitivity: Tight budget with no corrosion concern → Scenario C. Willing to invest upfront for long-term savings → Scenario A or B.
4. Installation factors: Need lightweight for rooftop or elevated? → Scenario A. Lifting equipment available? Steel is cheaper.

If you're still unsure, McNichols' customer service can help—I've called their catalog line and gotten a live, knowledgeable person who asked about my load, span, and environment before recommending a product. That's rare in this industry.

Pricing as of 2024: expect $20-50 per square foot for heavy-duty steel, $30-70 for aluminum, and $25-60 for fiberglass depending on load rating and span (based on mcnichols.com quotes, January 2024; verify current pricing).

One last thing: you might also need accessories like stair treads, or have a situation like removing a stripped screw in an existing installation—that's a separate decision. But for new projects, this framework should get you started.