In a renovation the floor is a budget you cannot exceed: raise it too far and every door binds, every threshold ramps, every step becomes a trip. The win goes to the system that delivers insulation and heat in the thinnest honest stack. That is exactly what dry systems are built for.
Where the millimetres go
A traditional warm floor is: existing slab + insulation + screed (50–70 mm) + UFH + screed + adhesive + tile. A dry UFH panel collapses the middle: existing slab + 20–30 mm grooved panel + thin adhesive + tile. You keep the warmth, lose the screed cure, and protect the height.
Build a thin, warm stack
| Layer | Dry build-up |
|---|---|
| Existing slab | As found, clean and level |
| Insulation / panel | 20–30 mm XPS grooved panel |
| Heating | Pipe/cable in the groove |
| Finish | Thin-set + tile (≈8–12 mm) |
| Total added | ~30–45 mm vs 70–100 mm screeded |
Steps to protect the height budget
- Measure first. Door clearance, threshold height and adjacent room levels set your ceiling for added height.
- Choose dry panels. A closed-cell XPS panel insulates and routes the heating in one 20–30 mm layer.
- Overboard, do not rip out. Where the old surface is sound, a 6 mm backer board overboarding saves height versus demolition.
- Balance the adhesive. Use a thin, reinforced bed; a fat one eats the budget you just saved.
- Check transitions. Plan ramps or trims where the new floor meets unchanged rooms.
Where thin systems pay off most
- Upper-floor renovations where load and height are both tight.
- Period homes with original doors and skirtings worth keeping.
- Quick-turnover rentals that cannot afford weeks of screed cure.
Mistakes that blow the budget
- Discovering the door bind after tiling — measure the full stack before ordering.
- Using a thick insulation "just in case" when a graded 20–30 mm XPS already meets spec.
- Forgetting the adjacent room, so you build a step you then have to ramp.
Frequently asked questions
How thin can a warm floor be?
A dry panel build adds roughly 30–45 mm total (panel + adhesive + tile) versus 70–100 mm for a screeded system.
Can I keep my existing floor?
If it is sound and level, overboard with a thin backer board instead of ripping out — it saves height and time.
Will a thin build still insulate?
Yes — closed-cell XPS panels insulate and route the heating in one 20–30 mm layer; thickness is matched to the R-value you need.
Do I lose heat without screed?
No. Dry panels conduct heat up into the tile efficiently; the screed was structural mass, not a heater.
What breaks the height budget?
A fat adhesive bed, over-thick insulation, or forgetting to measure door and threshold clearance before ordering.
Warm floor, same door height
TANYTE dry underfloor heating panels and XPS boards deliver insulated, heated floors in a 20–30 mm layer — built for renovation height budgets.