Can You Use Zellige Tile With Radiant Floor Heating?

Yes, you can use zellige tile over radiant floor heating. Zellige is a fired clay tile, and fired clay conducts heat well, so a warm floor works under it the same way it does under ceramic or porcelain. What changes is the preparation: handmade zellige is thicker and less uniform than machine-made tile, so the setting bed, the heating system and the warm-up schedule all need to be planned around it.

The short version: choose bejmat or square zellige in a floor-suitable format, set it in a full bed of quality thin-set over a membrane or heating mat rated for tile, leave a joint of at least 1/8 inch on floors, and bring the heat up slowly after the mortar has fully cured. Always follow your heating system manufacturer's instructions where they are stricter than anything here.

In this article

• Does zellige tile work with radiant floor heating?
• Zellige vs standard tile over radiant heat
• How should you prepare the floor?
• How do you warm up a zellige floor safely?
• Which zellige is best for heated floors?
• FAQ

Does Zellige Tile Work With Radiant Floor Heating?

It does. Radiant systems, whether electric cable, electric mat or hydronic tubing, are designed to sit under tile, and tile is one of the best flooring surfaces for them because it passes heat upward and holds it. Zellige is a glazed terracotta body, so it behaves like other fired clay tile in this respect.

The difference is thickness. Handmade zellige is thicker than most machine-made wall tile, and that extra mass means a heated zellige floor can take a little longer to warm up. Once it is warm, it also holds the heat longer after the system cycles off. Our guide to how thick zellige tiles are explains why this matters for the installation as a whole.

Zellige vs Standard Tile Over Radiant Heat

How Should You Prepare a Heated Floor for Zellige?

Start with the heating layer. Most radiant installs under tile use either an electric mat or cable embedded in the mortar, or a heating system built into an uncoupling membrane. Whichever you choose, confirm it is rated for tile and that its thin-set requirements match what zellige needs.

Then plan the tile layer around three rules that apply to any handmade floor tile:

• Use a full bed. Butter the back of each tile and comb the floor so there are no hollow spots. Voids over a heating element trap heat and can lead to uneven stress.
• Keep joints at 1/8 inch or wider. Floors need more room than walls to allow for dimensional variation and movement. See our zellige grout spacing guide for color and joint choices.
• Seal unglazed tile first. Unglazed zellige needs a penetrating sealer before grouting. Our post on whether zellige needs sealing covers when it applies.

How Do You Warm Up a Zellige Floor Safely?

Do not switch the heat on right after tiling. Let the thin-set and grout cure for the time the manufacturers specify, and keep the system off during that period. Then raise the temperature gradually over several days instead of jumping straight to full heat, because rapid heating is hard on any tile floor.

Day to day, set a moderate floor temperature. Most heating manufacturers cap surface temperature, so check your system's limit and use a floor sensor rather than guessing. A zellige floor holds warmth well, so you can usually run it lower than you would a thinner tile.

Which Zellige Is Best for Heated Floors?

If you are shopping for zellige floor tile, bejmat is the natural choice. The 6x2 format has more joints and a smaller footprint per tile, which suits floors, and it lays in running bond, herringbone or stacked patterns. Our guide to bejmat laying patterns shows which hold up best on a floor. Square zellige also works where the tile is set carefully and the joint is wide enough. For more on the basics, read can you actually use zellige on the floor.

Planning a heated floor for a client? The Handtile Trade Program offers pricing and support for designers, architects and contractors. You can also browse our floor zellige tiles and read our guide to zellige installation cost and finding an installer.

Frequently Asked Questions

Can you put zellige tile over underfloor heating?

Yes. Fired clay tile transfers heat well, so zellige works over electric and hydronic radiant systems when installed with a full bed of thin-set and the correct joint width.

Is zellige too thick for radiant heat?

No, but it is thicker than many machine-made tiles, so it warms up a little more slowly and then holds heat longer. Plan for a slightly longer warm-up time.

Can zellige crack from floor heating?

Cracking is usually caused by heating too fast, poor mortar coverage or movement in the subfloor, not by the heat itself. Cure the mortar fully, ramp the temperature up gradually and use a membrane or mat designed for tile.

What grout joint should I use on a heated zellige floor?

Use at least 1/8 inch on floors. Wider joints give handmade tile room for natural size variation.

Does a heated zellige floor need sealing?

Unglazed zellige should be sealed before grouting and protected afterward. Glazed zellige generally does not need sealing. Check the finish of the specific tile you buy.

Should I hire an installer for a heated zellige floor?

Yes. Radiant heat plus handmade tile is a job for a setter with zellige experience and a tile-rated heating installer working together.