Grooved XPS Underfloor Heating Board
Your loop plan, our router. High-density XPS board with pipe grooves routed to your drawing — serpentine, spiral, or return patterns — so the pipe lands exactly where the heat-loss calculation put it. Ships ready for press-fit pipes and screed.
| Core: | High-density XPS |
| Thermal conductivity: | 0.030 W/(m·K) |
| Grooves: | Routed to your loop plan |
| Sizes: | Custom, cut to drawing |
Overview
A water underfloor floor heats evenly for one boring reason: the pipe is exactly where the plan put it, and it stays there while the screed cures around it. Shift the pipe 40 mm and that stretch of floor runs cool for the life of the building. The board under the pipe is what decides whether the layout survives the install.
This is the grooved version of the same high-density XPS we build our backer boards on: 0.030 W/(m·K) thermal conductivity, batch-tested production, roughly 30% lighter than a cement-based board of the same size. The difference is the cut. Send us your loop plan and the grooves are routed at the factory — serpentine runs, spiral patterns, return bends — matched to your pipe diameter so the pipe presses in firm instead of floating loose in an oversized channel.
Installation follows our floor method: boards laid on a level substrate, joints taped and sealed, pipes pressed into the grooves, then a mortar screed with mesh embedded over the top. Tile or stone finishes go onto the screed once it has cured on its own schedule. The board holds the geometry; the screed does the curing. Neither rushes the other.
One honest boundary: this board does not set your pipe spacing — the heat-loss calculation does. And if your project is electric cable rather than water pipe, check the cable maker’s embedment specification before routing anything. We route to your drawing; we do not second-guess it.
Applications
Water underfloor heating under tile and stone
Custom loop layouts from drawings
Whole-floor renovation and new build
Overlay panels for screed systems
Fixing
Level the substrate first — the board follows it, groove depth does not forgive humps. Lay the boards, tape and seal every joint, press the pipes into the routed grooves, then screed over with mesh embedded. Pipe spacing stays where the plan put it. Send the drawing with your order and the grooves arrive already cut.
Complete the System
One material system, one fixing pattern — these usually ship together.