What Is the 1/3 Rule for Tiles (And When Should You Use It)?

⏱ Estimated reading time: 2 minutes · ✍️ By Dipak Patel

Short Definition

The 1/3 rule recommends staggering rectangular tiles by no more than one‑third of their length. For a 900mm plank, offset ≤ 300mm. This reduces lippage (height differences between tile edges) caused by slight manufacturing bow in long tiles.

Why the 1/3 Rule Exists

Many long tiles have subtle curvature. At a 50% brick‑bond, the highest point of one tile meets the lowest point of the next, exaggerating unevenness. A ≤ 33% offset distributes curvature and maintains a flatter plane.

Where It Helps Most

• Wood‑effect planks (e.g., 900×200, 1200×200).
• Large‑format rectangles (e.g., 600×300).
• Rooms with raking light (sunlight across the surface shows lips).

Alternatives to Consider

• Straight lay: Minimal, crisp, and quick to install.
• Random stagger ≤ 1/3: Creates flow without hitting 50% overlap.
• Herringbone: Great for smaller planks; avoid with very long tiles unless approved by the manufacturer.

Layout Example

With 900×200mm planks:

• 50% offset: 450mm (riskier for bowing).
• 1/3 max: 300mm (preferred to reduce lippage).
• Random offsets ≤ 300mm maintain variety without increasing risk.

Pro Tips

• Check the box: many manufacturers specify ≤ 33% offset for long tiles.
• Use levelling clips and ensure consistent trowel technique.
• Dry‑lay rows before mixing adhesive to confirm the pattern looks balanced.

Takeaway

The 1/3 rule is a practical way to achieve smoother, more professional results with long planks and big rectangles—without sacrificing style.