Manufactured from (EPS) Extruded Polystyrene Insulation, Underboard panels are faced with pre-bonded soft temper aluminium sheets; panels can be easily trimmed on-site. The system has been designed to eliminate air gaps between the base of the floor deck and the Underboard panel, direct contact with the heat diffuser ensures good thermal transfer. Underboard Acoustic Batten panels are 35mm thick, and sit between acoustic battens which ensure the panels have direct contact with the finished floor. Underboard panels transfer heat far more efficiently by more than 30% compared to aluminium diffuser plates making the system suitable for lower temperature heat sources. When the panels are in place the pipe is easily pressed into the channel piercing the foil, battens are notched where the pipe loop passes through battens to the next panel.