Foil-Tec - Floating Timber

The heat loss in a floor is greater at the exposed perimeter edge of the floor. To calculate the U-Value, the exposed perimeter edge to area ratio needs to be worked out e.g. – a 100m² area, semi-detached house with 3 external walls of 10m each has a perimeter edge to area ratio of 0.3 (i.e. 30m ÷ 100m² = 0.3) which, using Foil-Tec Single, gives a U-Value of 0.3 W/m²K.

  • Foil-Tec Single is rolled out onto the concrete floor with the shiny side facing upwards – leaving enough edge overlap for 75mm lip to be left behind skirting
  • Timber battens/joists (min 50mm x 50mm) are then laid on top of the Foil-Tec Single, spaced at cebtres to suit the particular flooring.
  • The decking is then fixed with screws (at 200mm centres) into battens/joists providing 25mm penetration into the 50mm wide battens/joists.
P/A RatioU-Value (with 50mm Cavity)U-Value (with 100mm Cavity)
0.20.24 W/m²K0.22 W/m²K
0.40.35 W/m²K0.30 W/m²K
0.60.41 W/m²K0.35 W/m²K
0.80.44 W/m²K0.38 W/m²K
10.47 W/m²K0.40 W/m²K