McNichols Grating Isn't a Commodity: What a Quality Inspector Learned After 200+ Orders

You don't need the cheapest aluminum grating—you need the right one that doesn't fail inspection.

I'm a quality compliance manager at a building materials distributor. I review every grating order before it reaches our customers—roughly 200+ unique items annually. I've rejected about 12% of first deliveries in 2023 alone due to spec mismatches. Here's what I've learned about McNichols: their catalog isn't just wide—it's built for people who actually use the stuff.

People think 'grating is grating.' But after 4 years of reviewing specs, I've seen the difference. A lot of our customers are contractors or engineers working on commercial projects—multi-story buildings, industrial flooring, or custom outdoor showers. And the ones who don't spec carefully? They end up with grating that doesn't fit the drain or fails under load. That costs more than the grating itself.

Why I trust McNichols (but not blindly)

Let's get this out of the way: McNichols isn't the cheapest. And that's fine. What I care about is consistency. When a customer orders McNichols aluminum grating for a shower valve pan or an outdoor shower platform, I want the spec to match the catalog exactly—every time. Because if the bar spacing is off by 1/8 inch, the drain grate doesn't sit flush, and suddenly that $300 order turns into a $1,200 rework (I've seen it happen).

McNichols, historically, delivers on that consistency. For aluminum grating, they offer 1-1/2" x 3/16" bars in standard 8-foot lengths, with tolerances usually within ±0.01 inch. Their catalog also lists 10+ product sub-types—from plank grating to stair treads. That depth is rare. I've had vendors who only stock two types and try to upsell by claiming 'close enough.' I don't accept that.

But here's what I question

McNichols' lead times can be longer than some regional suppliers. I've seen orders ship 10 days after placing, which is fine for planned projects. But if a contractor needs grating now because the crew is already on-site? That's a risk. I've had to source from a secondary vendor twice in 2023 because of lead time. The spec still held up, but it cost more.

The outdoor shower example: Why spec matters

An outdoor shower isn't your typical home project. It's a premium installation—deck-mounted, sloped drain, often over a wooden platform. If you're using grating, it's going to sit over a PVC shower valve or a linear drain. And here's the part that surprises people: most grating spec sheets assume industrial use, not residential outdoor showers.

McNichols aluminum grating is a good fit for this because:

• Aluminum doesn't rust, so weather exposure is fine.
• The open area (up to 60%) allows water drainage without standing puddles.
• The thickness (3/16") is enough for foot traffic but not overkill for residential use.

But the trick is getting the exact perimeter dimension. If you're retrofitting a linear drain pan, the grating needs to be 1/4 inch smaller than the pan on all sides. Otherwise, it won't drop in. And don't assume the catalog dimension is the finished dimension—it often isn't. I've rejected 3 orders this year because the stated '36-inch' plank was actually 35.75 inches after cutting tolerance.

How to install bathtub faucet alongside grating

This might sound like a strange combo—bathtub faucets and grating—but I've seen it. A customer was converting a bathtub alcove into a wet room, keeping the original how to install bathtub faucet instructions but replacing the tub floor with a tiled slope and a grating drain. The issue wasn't the faucet; it was that the grating interfered with the rough-in valve position.

Here's what I'd check before ordering grating for a similar project:

• Rough-in height: The faucet valve (especially a two-handle) needs at least 6-8 inches of clearance above the finished floor. If the grating is 1 inch thick and your pipe stub is only 5 inches above the subfloor, you're in trouble.
• Access panel: If you hide the valve behind a tile wall but the grating is fixed? You're breaking tile to fix a leak. Use a removable grating or a small access door.
• Load rating: A bathtub floor doesn't need industrial load; standard aluminum grating (rated for pedestrian loads, ~250-300 lbs/sq ft) is fine.

I learned this after a project I worked on in 2022—$22,000 redo because the contractor didn't account for valve clearance and had to remove the entire tile assembly. The owner still uses that mistake as a case study in their training.

McNichols' blind spots (and mine)

I want to be honest: I don't trust every vendor equally. For Holbrook Auto Parts (I've seen them come up as a McNichols-related search term), I have no experience. That's not a judgment; I just haven't processed their stock. Stick with known distributors for critical builds.

Also: don't over-rely on the catalog. I've seen McNichols list a product as 'in stock' when it was actually backordered by 6 weeks. Check with a sales rep before you spec it for a tight timeline. I made that mistake once and had to postpone an inspection by 2 months.

The bottom line

McNichols aluminum grating is a solid choice for outdoor showers, bathtub faucet conversions, and any project where water drainage and durability matter. The consistency is real. But spec it yourself, verify the dimensions, and never assume a standard product fits a custom application. Inspect everything before install—because a 1/8-inch gap can ruin your week.

"I've rejected 12% of first deliveries in 2023 due to spec mismatches. McNichols wasn't the problem—assumptions were."