Independent tools for healthier UK homes
Built from real building-survey experience
Mould
Safe
Damp, mould & heat tools
Home
Calculators
Dew point
Condensation risk
Mould risk
Surface humidity
Ventilation
Required airflow
EWI benefit
Warmer wall surfaces
Heat loss
Energy estimate
U-value
Fabric performance
How it works
Check your home
EWI Surface Temperature Benefit
Wall Type:
PRC Concrete Panel (U ≈ 2.1)
Solid Brick (U ≈ 1.8)
Stone Wall (U ≈ 1.5)
Single Skin Blockwork (U ≈ 1.2)
Uninsulated Cavity (U ≈ 1.0)
Cavity with Poor Fill (U ≈ 0.8)
Timber Frame (U ≈ 0.6)
Insulation Type:
EPS (λ = 0.038)
Graphite EPS (λ = 0.033)
Mineral Wool (λ = 0.035)
Phenolic (λ = 0.022)
Insulation Thickness (mm):
Internal Temperature (°C):
External Temperature (°C):
Calculate Surface Temp Benefit
Submit the form to view your results and graph.
Key Terms:
EWI = External Wall Insulation · λ = Insulation conductivity · U-value = Heat loss rate
Surface temp = Internal wall face temperature · Lower U-value = Better insulation
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