Ideal solution for under floorboards where height is a constraint.

The Profoil® JOIST Panel is a lightweight foil faces strip panel suitable for between joist application, the panel comes with a 100 micron foil, maximising heat transfer. Profoil joist is a zero build up panel suitable for installations that can’t afford the extra height build up!


Zero build up, existing joist compatible, even heat distribution.

ICONS – inexpensive, cut to size, light weight.


Especially suitable for older properties where floorboards need to come up for heating to be installed.


  • Panel Dimensions: 1200 x 350 x 50mm – (0.042m² = 1 Panel)
  • Material: Expanded polystyrene (100Kpa)
  • Pipe Diameter: 16mm
  • Thermal Conductivity: 0.036 W/mK
  • Foil Thickness: 100 Microns
  • Pipe Runs: 2 grooves at 200mm centres with radius returns + 3 cross runs at the top to return to manifolds.


All our systems are energy efficient, but to assist you with your selection we have graded them A to C, where A is the most energy efficient. Note floor coverings can impact heat output.

Energy efficient rating: C


View the following technical information for the Profix Joist Panel