GroutConsult
Most tile failures are
specced in, not installed in.
The contractor didn't fail.
The specification did.
Every case below came through a referral. A homeowner, a designer, or a builder who needed someone to walk the site and read what the tile was telling them. The failures are predictable. So are the fixes — when you know what to spec before the installer ever loads a trowel.
The Problem
Wrong Trowel Notch
Contractor used a 3/16″ V-notch on 24×48 porcelain slabs.
Large-format tile requires ≥95% mortar coverage. A V-notch leaves parallel ridges — air pockets that crack under thermal cycling and foot traffic within 18 months.
Full tile replacement. Estimated cost: $8,400.
The Fix
Spec: 1/2″ × 1/2″ × 1/2″ Square-Notch
Specification Sheet
The Problem
Uncoupling Membrane Skipped
Tile set directly over wood subfloor with modified thinset.
Wood flexes seasonally. Without an uncoupling membrane, the rigid tile bond transfers that movement directly into grout and tile edges. Cracking begins at the joints within one heating season.
Substrate rebuild + retile. Estimated cost: $14,200.
The Fix
Spec: Schluter DITRA Uncoupling Layer
Specification Sheet
The Problem
No Slope to Drain
Shower floor tiled flat. Standing water pooling at the threshold.
Code requires 1/4″ per foot slope to drain. A flat shower floor traps water, saturates the substrate, and — without a pre-sloped mortar bed or foam pan — drives water through grout into the framing. Mold follows within 6 months.
Structural water damage, mold remediation, full rebuild. Estimated cost: $22,000–$35,000.
The Fix
Spec: Pre-Sloped Foam Pan + Linear Drain
Specification Sheet
Four phases.
Zero surprises.
Issues caught before a tile is set cost nothing to fix. Issues caught after a tile is set cost the project. The process below is designed to find every problem at the cheapest possible moment.
Site Audit
2–3 hours on-site
Walk every surface that will hold tile. Probe for hollow spots, check substrate deflection, measure slope to drain, assess moisture with a pin meter. No assumptions.
Deliverables
Material Specification
3–5 business days
Specify every product by brand, model, and ANSI standard. Thinset type (modified vs. unmodified), mortar coverage requirement, membrane system, grout joint width, movement joint locations.
Deliverables
Installer Vetting
1 week
Review installer credentials, request references on comparable work, and conduct a 20-minute phone interview covering lippage tolerance, trowel selection, and waterproofing protocol. Most contractors fail this call.
Deliverables
On-Site Quality Checks
2–4 site visits
Visit at substrate stage, membrane stage, and mid-install. Check mortar coverage with lift tests, verify slope, confirm lippage is within tolerance. Issues caught here cost $0 to fix.
Deliverables
Most projects are scoped and spec'd within two weeks of the initial call. Availability is limited to 4 active projects at a time.
Schedule a Site AuditBuilders and designers
who avoided the tear-out.
Projects Consulted
In Repairs Prevented
Field Experience
We were three weeks into a $90,000 master bath renovation when the tile setter started laying 48×48 porcelain directly over our subfloor with modified thinset. One call to GroutConsult, one site visit, and we had a full spec sheet in hand. We stopped the job, added DITRA, and the installer followed the spec exactly. That bathroom has been perfect for two years.
$18,000 in projected repairs avoided
Margaret Holloway
Homeowner · Custom Renovation, Westchester County
Master Bathroom
I source large-format stone for commercial lobbies and hospitality projects. Lippage on a 48×96 slab in a hotel corridor is a lawsuit waiting to happen. Having a consultant who can spec the mortar bed, verify substrate flatness tolerances, and put it in writing has changed the way I work with GCs. I won't quote a commercial floor without this step.
Specification sign-off on 12 commercial projects
Rafael Dominguez
Senior Associate · Meridian Interior Design, Chicago
Commercial Lobby
We build 8–12 custom homes a year. I used to find out about tile problems at the punch list — tenting floors, grout cracking in the shower after the first winter. Now I bring in a tile consultant before the waterproofing stage on every bathroom. The installer vetting alone has paid for itself. We've stopped using two installers who couldn't answer basic questions about modified versus unmodified thinset.
Eliminated tile-related callbacks across 22 bathrooms
Thomas Abernethy
Principal · Abernethy Custom Homes, Nashville
Custom Home Builder
Get Your
Tile Audit.
Tell us what you're working with. A 15-minute review of your project details determines whether a site visit makes sense and what it would cover. No obligation.
The 9-Point
Tile Spec Checklist
The same checklist used on every site audit. Walk your project against it before the installer starts — or use it to evaluate work already in progress.
Start with the
free checklist.
Nine questions that reveal whether your tile job is being set up for success or failure. Most homeowners read it and call within a week.