Styrofloor® thickness (mm) & thermal resistance (m2k/W)

P / AUninsulated Floor436893118168
Ratio'U' Value0.991.852.713.585.30
(W/m2K)Improved 'U' Value by the addition of Styrofloor
0.100.210.170.150.130.120.10
0.200.360.260.210.180.160.12
0.300.490.330.260.210.180.14
0.400.60.380.290.230.190.14
0.500.730.420.310.240.200.15
0.600.820.450.330.250.210.16
0.700.910.480.340.260.210.16
0.800.990.500.350.270.220.16
0.901.050.510.360.270.220.16
1.001.100.530.360.280.220.16
P= Exposed Perimeter of Floor (Metres) A= Area of Floor (Sq. Metres)

Area calculator

Thermal Calculations

In order to calculate how much floor insulation is needed, please refer to the P/A (Perimeter / Area) table above.

The perimeter / area ratio is calculated by dividing the length of exposed perimeter wall (in Meters) by the floor area of the room to be insulated (in square meters).

The exposed part of the wall is any wall which is connected to an unheated space e.g., the outside of the building.
Rooms with less exposed perimeter will require less insulation and vice versa.

Example Calculation

A living room to be insulated has a total floor area of 16.4 square meters. Along the perimeter of the room, there is 5.3 meters of wall which is attached to the outside of the building.

Therefore, the p/a ratio is: 5.3 divided by 16.4 = a p/a ratio of 0.33. This figure is rounded up to the nearest figure on the table which is 0.4

If the U Value requirement for the room is 0.22W/m2k, the 118mm Styrofloor® board would be required which achieves a slightly better U Value at 0.21W/m2k.

If you require assistance with thermal calculations, please contact our technical department on 0114 249 5626.

Insulation Properties

Board Dimensions
Length2400mm
Width600mm
Standard Overall Thickness* (18mm Chipboard)Thermal Resistance (M2K/W)
43mm0.89
68mm1.56
93mm2.27
118mm2.83
168mm4.36
*Other thickness available on request
  
XPS Properties
Compressive Strength300kPa
  
Chipboard Properties
Density695kg/m3
Moisture Content5-13%