I’ll say it plainly: I’ve made more mistakes specifying tile in the last four years than I care to admit. But owning them has saved my firm a lot of money.
I’m a project manager handling material specifications for a mid-sized commercial architecture firm. In my first year (2021), I submitted a tile specification with a shade variation note that didn’t match the actual production run. The result? A $3,200 order of beautiful porcelain tile that had to be pulled from a lobby floor because the color shift between boxes was visually jarring. Straight to the trash. That was my first big error.
Since then, I've personally made (and documented) seven significant specification mistakes, totaling roughly $8,400 in wasted budget on tile alone. I now maintain our team’s pre-installation checklist to prevent others from repeating my errors. This isn’t a guide to Marazzi’s entire catalog—it’s a guide to the pitfalls I’ve fallen into, and how you can avoid them.
My Core Argument: The Specification is Not Just a Product Code
I believe the single most expensive mistake in commercial tile work is treating the specification as a simple “pick a color and a size” exercise. The spec is the contract between the designer’s intent and the installer’s reality. A vague spec invites interpretation. Interpretation leads to mismatch. Mismatch leads to redo. I’ve seen this exact chain of events unfold on three separate projects.
Mistake #1: Ignoring Shade Variation
My $3,200 mistake was on a Mediterranean-inspired porcelain floor tile, a type like a Marazzi Montagna or Materia series, which has intentional shade variation. The manufacturer’s website showed a beautiful, subtle blend. I specified it. But I didn’t specify “V2” shade variation or include a note to blend boxes.
The installer, efficiently installing from one box at a time, created a checkerboard effect where some areas were distinctly darker and others lighter. It looked like a patchwork quilt, not a continuous floor.
The lesson: Always specify the shade variation level (V1-V4) and include a line in your spec saying “Install with boxes blended to avoid abrupt color changes. For V2 or higher variation, request a mock-up panel.”
I learned this the hard way. A simple, two-line addition to my spec now prevents this. It cost me $3,200, a one-week delay, and a lot of professional embarrassment.
Mistake #2: Assuming Rectified Edges on a Non-Rectified Product
This one is more technical but equally painful. On a project in San Diego (which brought up the search for “Marazzi tile San Diego”), I specified a large-format porcelain tile for a shower wall. The tile was beautiful, a concrete-look series like Marazzi’s Urban Loft. I assumed all large-format tile has rectified edges (meaning perfectly square edges that allow for very thin grout lines). It didn’t.
The tile had a slight “pillowing” effect on the edges. The result? When the installer laid them with the 1/16-inch grout line I had specified, the lips (edges) didn’t line up. The wall looked like a series of gentle hills and valleys. We had to redo the entire shower. That one cost $1,800 in labor and materials, plus a 2-week project delay.
The lesson: Always check the technical data sheet (like those on Marazzi’s site) for “rectified” vs. “non-rectified” status. If it’s non-rectified, specify a wider grout joint (typically 1/8 to 3/16 inch). Do not assume. (Note to self: I really should have this data sheet printed out for every new product we specify.)
Mistake #3: Forgetting the Highball Glass Test (The “Finish” Factor)
This is a weird one, but stick with me. I had a client who wanted a bar countertop in a high-end residential project. They loved the look of a honed, matte-finish porcelain tile—something like a Marazzi Highball series (a glass-and-metal look that’s very popular). It looked perfect on the sample. But we didn’t test it in context.
The client’s bar was right next to a window. Under natural light, the matte finish showed every single water spot and fingerprint. The client compared it to a “dirty highball glass.” They hated it. We ended up replacing the countertop with a polished finish at a significant cost.
The lesson: Always perform a “finish test” under the actual lighting conditions of the space. Bring a sample to the job site. Look at it at different times of day. Simulate the use-case. If it’s a bar or a high-touch surface, a matte finish might not be the right choice. The client’s aesthetic preference is important, but it has to work in the real world.
Addressing the Obvious Objection: “Isn’t This Just Basic Due Diligence?”
You might be thinking: “This is just common sense. Why are you making these mistakes?” And you’d be right. But here’s the thing— the pressure of deadlines and the noise of a busy project schedule make it easy to skip the “obvious” steps. We’re all in a rush. I’ve seen experienced architects make version of these same mistakes because they were relying on “tribal knowledge” rather than a written checklist.
The question isn’t “Are you smart enough to avoid this?” It’s “Do you have a system that prevents it when you’re stressed?” My system is now a three-question checklist before any tile spec leaves my desk: 1. Have I specified the shade variation? 2. Have I confirmed rectified vs. non-rectified? 3. Have I tested the finish under actual light?
I’d rather spend ten minutes explaining those three questions to a junior designer than deal with a $3,200 redo. An informed specification is a good specification. It saves time, money, and professional credibility.
My advice? Adopt that checklist. Don’t be like me.
