How to tell if your tile installer cut corners

Lippage that climbs out of tolerance

Industry-standard lippage tolerance is roughly 1/32" for rectified tile and 1/16" for pressed tile. Anything more visible than that, on a flat substrate, means the installer either skipped lippage adjusters or didn't bother dialing them in.

How to spot it: get down at floor level and look across the surface. If the highlight bands look jagged from edge to edge — lippage. If they form clean continuous lines — the install respected the spec.

Grout joints that breathe

Grout joints should be consistent in width within the same room. A 1/8" joint that swells to 1/4" near a corner is a layout problem the installer didn't solve at start of layout.

Walk the perimeter. Cuts at walls and cabinets should be at least half a tile wide — anything narrower means the installer didn't set the field properly and is now hiding it under base.

Backer board fastening pattern

Common industry practice is roughly 6" on center along edges and 8" in the field. Most installers skip this in favor of speed. You can't see the fasteners on a finished floor — but the proxy is movement. Step in the middle of a tile and apply real weight. If you feel any deflection, the substrate isn't fastened the way it should be.

The other tell: hollow sounds when you tap. Run a coin or a key across the surface — solid tiles ring; floating tiles thunk.

Waterproofing in wet areas (the one that bites later)

Showers and tub surrounds need a continuous waterproofing layer — either a branded sheet membrane or a liquid-applied system — running to the curb and up the walls. The installer who skips this on a 2026 install hands the homeowner a moisture problem in 2027.

You can't inspect this on a finished install. But you should have asked for photos before the tile went up. If the installer can't produce them, that's its own answer.

Pattern alignment at transitions

Where tile meets adjacent flooring (hardwood, carpet, the room next door), the cuts should land at consistent depths. A run that hits a doorway and skips from 6" to 1.5" without explanation is layout that wasn't planned.

Before you call anyone out

If you've noticed lippage, wide grout gaps, or hollow tiles and aren't sure whether to make a scene — the cheapest first step isn't a contractor callback or a paid third-party inspection. It's a documented second opinion you can refer back to.

**Supervisr's tile QA model** follows industry standards and guidelines set forth by TCNA, NTCA, ANSI (A108 / A118 substrate and mortar specs), and the major tile waterproofing manufacturers. It can review tile photos for lippage tolerance, joint consistency, layout, and substrate bond. Upload a few photos and you'll get a documented evaluation back in minutes — with citations to the specific standards involved. It's the same checklist a careful inspector uses, applied to your photos.

For homeowners, that documentation is your conversation-starter with the contractor (or, if needed, your insurer or warranty carrier). For contractors, it's the third-party verification that closes the conversation cleanly.

About Supervisr

Supervisr is an AI quality-assurance platform for residential tile installations. It follows industry standards and guidelines set forth by TCNA, NTCA, ANSI, and the major tile waterproofing manufacturers, and analyzes tile installation photos to flag issues with waterproofing, layout, and substrate prep.

Homeowners use Supervisr to verify a tile installer's work without playing inspector themselves. Contractors use Supervisr to document quality at each milestone — protecting against warranty disputes and building a track record of verified work.