Wall U-Value Calculations

Wall Type 1 - Description: 

102mm brick, 60mm cavity, reflective membrane, SIP at specified thickness, reflective Vapour Control Layer (VCL), 25mm Service void, 12.5mm plasterboard

U-Value

0.12W/m²K

0.13W/m²K

0.15W/m²K

0.17W/m²K

0.19W/m²K

U-Value Calculation

SIP Thickness

219mm

194mm

169mm

144mm

119mm

Total Wall Thickness

419mm

394mm

366mm

344mm

319mm

Condensation

Calculation

Wall Type 2 - Description:

5mm smooth render, 12mm Magnesiun Oxide Board (MgO), non reflective breather membrane, SIP at specified thickness, reflective VCL, 25mm service void, 12.5mm plasterboard

SIP Thickness

219mm

194mm

169mm

144mm

119mm

U-Value

0.13W/m²K

0.15W/m²K

0.17W/m²K

0.19W/m²K

0.23W/m²K

U-Value Calculation

Total Wall Thickness

271mm

246mm

221mm

196mm

171mm

Condensation Calculation

Wall Type 3 - Description: 

18mm timber cladding, 50mm cavity, reflective membrane, SIP at specified thickness, reflective VCL, 25mm   Service void, 12.5mm plasterboard

Total Wall Thickness

325mm

300mm

272mm

250mm

225mm

U-Value

0.13W/m²K

0.15W/m²K

0.17W/m²K

0.19W/m²K

0.23W/m²K

U-Value Calculation

SIP Thickness

219mm

194mm

169mm

144mm

119mm

Condensation

Calculation