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 Ratio||U-Value (with 50mm Cavity)||U-Value (with 100mm Cavity)|
|0.2||0.24 W/m²K||0.22 W/m²K|
|0.4||0.35 W/m²K||0.30 W/m²K|
|0.6||0.41 W/m²K||0.35 W/m²K|
|0.8||0.44 W/m²K||0.38 W/m²K|
|1||0.47 W/m²K||0.40 W/m²K|