- Example U Value Calculation -
Typical Kenkast Bungalows
 
 
Construction Type
Element: Wall - Concrete Panel
Exposure: Normal
Internal Surface Emissivity: High
External Surface Emissivity: High
Building Use: Domestic House / Flat


Prior to WBS system application
Thickness
Thermal Conductivity
Thermal Resistance
Vapour Resistivity
Vapour Resistance
 
(mm)
(W/m²K)
(m²K/W)
(MNs/gm)
(MNs/g)
Outside surface resistance
-
-
0.040
-
-
Traditional Render
20.00
0.556
0.036
100.00
2.00
Kenkast concrete panel
150.00
1.667
0.090
200.00
30.00
Plasterboard & skim
16.00
0.160
0.100
60.00
0.96
Inside surface resistance
-
-
0.130
U-Value, Proportionate Area Method:
2.525 (W/m²K)


90mm Mineral Wool
Thickness
Thermal Conductivity
Thermal Resistance
Vapour Resistivity
Vapour Resistance
 
(mm)
(W/m²K)
(m²K/W)
(MNs/gm)
(MNs/g)
Outside surface resistance
-
-
0.040
-
-
WBS Polymer Cement Render
10.00
0.115
0.087
0.00
0.00
WBS Mineral Wool Insulation
90.00
0.036
2.500
0.00
0.00
Traditional Render
20.00
0.556
0.036
100.00
2.00
Kenkast concrete panel
150.00
1.667
0.090
200.00
30.00
Plasterboard & skim
16.00
0.160
0.100
60.00
0.96
Inside surface resistance
-
-
0.130
U-Value, Proportionate Area Method:
0.335 (W/m²K)


60mm Phenolic
Thickness
Thermal Conductivity
Thermal Resistance
Vapour Resistivity
Vapour Resistance
 
(mm)
(W/m²K)
(m²K/W)
(MNs/gm)
(MNs/g)
Outside surface resistance
-
-
0.040
-
-
WBS Polymer Cement Render
10.00
0.115
0.087
0.00
0.00
WBS Phenolic Insulation
60.00
0.021
2.857
240.00
14.40
Traditional Render
20.00
0.556
0.036
100.00
2.00
Kenkast concrete panel
150.00
1.667
0.090
200.00
30.00
Plasterboard & skim
16.00
0.160
0.100
60.00
0.96
Inside surface resistance
-
-
0.130
U-Value, Proportionate Area Method:
0.229 (W/m²K)



 

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Provided strictly for guidance purposes only. WBS accept no liability for errors or omissions.
For a full U-value calculation, including Condensation Risk Analysis and Temperature Profiles,
please contact WBS Technical Support on 08458 382380.