What Are Rectified Tiles?

Rectified tiles are ceramic or porcelain tiles that have been precision machined after firing to produce perfectly straight, uniform edges and highly accurate dimensions. This additional manufacturing step allows rectified tiles to be installed with narrower grout joints, creating a cleaner, more contemporary appearance.

During firing, ceramic and porcelain tiles naturally shrink as they cool. This shrinkage can produce very slight variations in the final dimensions of each tile. While these differences are usually small and within recognised industry tolerances, they can become noticeable when tiles are laid side by side, particularly with narrow grout joints.

Rectification solves this problem by grinding or cutting the edges of each tile to an exact, consistent size after firing. The result is a tile with sharp, precise edges and highly uniform dimensions, allowing tighter joints and a more refined finished appearance.

How Are Rectified Tiles Made?

The rectification process takes place after the tiles have been fired and cooled:

1. Tiles are fired using standard ceramic or porcelain manufacturing processes.
2. After cooling, tiles are passed through precision grinding or cutting equipment.
3. Diamond-tipped blades or grinding wheels remove a small amount of material from each edge.
4. The finished tile has perfectly straight edges and highly consistent dimensions.
5. Tiles are inspected and graded.

This additional step adds to the manufacturing cost but significantly improves dimensional accuracy.

Why Does Rectification Matter?

Rectification matters because it directly affects how tiles can be installed and how the finished surface appears.

Non-rectified tiles have slightly rounded or uneven edges resulting from the firing process. These natural edges require wider grout joints to accommodate the variation.

Rectified tiles, with their precise edges, allow installers to use narrower grout joints, typically as narrow as 1.5 mm to 2 mm, depending on the tile and manufacturer's recommendations.

Advantages of Rectified Tiles

• Highly accurate dimensions.
• Perfectly straight edges.
• Narrower grout joints possible.
• Cleaner, more contemporary appearance.
• Better suited to large-format installations.
• More consistent tile-to-tile alignment.
• Professional, refined finish.

Rectified vs Non-Rectified

Non-rectified tiles are not inferior products. They are simply tiles that have not undergone the additional edge-grinding process.

Non-rectified tiles typically have:

• Slightly cushioned or rounded edges.
• Minor dimensional variation between tiles.
• Wider grout joints, often 3 mm or more.

Non-rectified tiles remain popular for many applications, particularly where a softer, more traditional appearance is desired or where wider grout joints complement the design.

Do Rectified Tiles Still Need Grout?

Yes. All tiled installations require grout joints.

Grout joints accommodate slight movement within the substrate, allow for thermal expansion and provide a finished appearance. Even rectified tiles should never be installed without grout joints.

Where Are Rectified Tiles Used?

Rectified tiles are commonly specified for:

• Contemporary bathrooms.
• Modern kitchens.
• Open-plan living spaces.
• Large-format floor installations.
• Feature walls.
• Commercial interiors.
• Hotels and restaurants.

They are particularly popular where a clean, minimalist aesthetic is desired.

Common Misunderstandings

Frequently Asked Questions

Conclusion

Rectified tiles offer a precision-finished edge that allows narrower grout joints and a cleaner, more contemporary appearance. They are particularly popular for large-format installations and modern interiors where minimal grout lines are desired.

While non-rectified tiles remain an excellent choice for many traditional and decorative applications, rectification provides an additional level of dimensional accuracy that is valued by architects, designers and homeowners seeking a refined, seamless finish.