Heating guide

Laying tiles on underfloor heating

Tiles and underfloor heating are a good team: tiles conduct heat well and store it for a long time. But the build-up, expansion joints and the right adhesive decide whether the floor lasts. We show what really matters.

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By the floorplanning.app editorial team

Build-up height: every millimetre counts

Underfloor heating eats height: heating pipes, screed, adhesive and tile quickly add up to 8–12 cm. Plan the build-up before installing doors, otherwise they will not fit in the frame later.

What matters in practice

Expansion joints are mandatory

Tiles expand when heated. Without movement joints the covering cracks. Rule of thumb: one expansion joint every 8 m of room length or 40 m² of area, closer with underfloor heating. The joints in screed and tile covering must line up.

Flexible adhesive and slow heating phase

Not every tile adhesive tolerates constant temperature changes. Use a flexible adhesive approved for underfloor heating. After grouting heat up slowly: maximum 5 °C per day, never from cold.

Format choice affects heat conduction

Large-format tiles have fewer joints and conduct heat slightly better, but tile thickness matters more than format. More important is that the format fits the dimensions well and produces little waste.

Checklist: tiles on underfloor heating

So that the heated floor lasts and heats evenly.

• •Clarify build-up height before door installation
• •Plan expansion joints per manufacturer and screed specifications
• •Use flexible adhesive suitable for heated floors
• •Choose format with low waste
• •Plan 10–15% reserve

How to plan heated floors

1. 1. Check heating system and screed data

   Ask for build-up height, heat output and screed drying phase.

2. 2. Align build-up height with doors and skirting

   Shorten doors before tiling or order new doors to fit.

3. 3. Test tile format and joint width in the tool

   Compare waste and cuts for different formats.

4. 4. Draw expansion joints into the floor plan

   Mark joint positions so they are cut correctly later.

5. 5. Order material including reserve

   Quantity including 10–15% reserve for breakage and repairs.

Examples from the tool

This is what it looks like planned out

The numbers above do not come from a spreadsheet but from a real layout. You can open these example projects directly – floor plan, laying plan and material list, exactly as the tool outputs them.

Flat with underfloor heating

Several rooms with one continuous tile layout – an example of planning room transitions, movement joints and material quantities together.

• •63.79 m² across 6 rooms
• •60 × 60 · 3 mm joint
• •10% reserve for material planning

Open example→

Three-room flat, one grid

Six rooms, eleven walls, five doorways – and a single herringbone grid running through every opening. Material is calculated for the whole flat at once.

• •63.79 m² across 6 rooms
• •90 × 30 herringbone, one grid
• •334 planks · 199 cuts

Open example→

Common questions