Large-format tile—15″ or greater on any side—delivers a seamless, modern aesthetic. But performance and longevity depend on strict adherence to TCNA and ANSI standards. At Tillerstead LLC, we don't cut corners: every step is engineered for lasting results and New Jersey HIC compliance.
⚖️ Flatness: The Foundation of Success
Tile only performs as well as the surface beneath it.
TCNA Handbook (Methods TR115 & TR117) mandates:
- ≤1/8″ variation in 10 ft (≤1/16″ in 24″) for tiles <15″
- ≤1/8″ in 10 ft for tiles ≥15″
- Flatness verified with a 10 ft straightedge per TCNA tolerance
Our process:
We mechanically grind or float high/low spots, using self-leveling
underlayments or patching compounds as needed. This eliminates lippage and
hollow spots—common failures with large-format tile.
Pro Tip: The larger the tile, the tighter the flatness tolerance. Substrate prep is non-negotiable.
🧱 Mortar Selection: Bond Strength That Lasts
Large-format and gauged porcelain panels require improved bond strength and
non-sag performance.
We specify mortars that meet or exceed:
- ANSI A118.4 — Modified thin-set mortars
- ANSI A118.15 — High-performance mortars for demanding applications
Preferred mortars:
- LATICRETE® 4-XLT, MAPEI® Ultraflex LFT, Custom® ProLite®
- Extended open time for precise layout
- Non-sag/medium-bed properties to support heavy tiles
Why it matters:
Standard thinset (A118.1) can slump, causing uneven bond lines and voids. We use
only mortars proven for large-format installations.
🔧 Trowel & Coverage: No Voids, No Excuses
Coverage is critical:
TCNA & ANSI A108.5 require:
- ≥80% coverage (dry areas)
- ≥95% coverage (wet areas: showers, floors)
- No voids >2 in²; none within 2″ of tile edges
Our method:
- Select trowel size to match tile back (typically 1/2"×1/2" or Euro-notch)
- Apply mortar with parallel ridges (one direction)
- Back-butter all large tiles to fill depressions
- Lift and check initial tiles for full coverage and ridge collapse
Proper ridge orientation and a 45° trowel angle allow air to escape, ensuring continuous contact and eliminating weak spots.
🧩 The Tillerstead Difference
- Tight joints with minimal lippage
- Consistent grout lines and flat transitions
- Full bond—no hollow sounds, no callbacks
- Floors and walls that meet or exceed TCNA/New Jersey HIC standards
Summary:
Precision is non-negotiable with large-format tile. Whether it's a porcelain
floor in Egg Harbor Township, a shower in Galloway, or a full bath
remodel in Atlantic County, Tillerstead delivers compliant, durable, and
beautiful results—every time.
Ready to start?
Email us at support@tillerstead.com or
schedule a consultation. We'll verify your substrate and recommend the right
system for your project.
Do the work with integrity and care.
Tillerstead LLC—where standards aren't optional.