The figures below are anticipated U-values calculated through a typical external wall make-up. Calculations can be provided on request, these should then be passed to your SAP assessor and used as part of their overall dwelling calculations.

U-Value = 0.21W/m2K

  • 20mm Render on external blockwork with a 50mm clear cavity
  • 9mm OSB3 Category 1 racking board
  • 040 Timber frame batt semi-rigid insulation installed between 140mm timber frame
  • 38mm Service battens to inside face

U-Value = 0.17W/m2K

  • 20mm Render on external blockwork with a 50mm clear cavity
  • 9mm OSB3 Category 1 racking board
  • 035 Timber frame batt semi-rigid insulation installed between 140mm timber frame
  • Photon Foil vapour control layer to inside face of frame
  • 38mm Service battens to inside face

U-Value = 0.15W/m2K

  • 20mm Render on external blockwork with a 50mm clear cavity
  • 9mm OSB3 Category 1 racking board
  • 035 Timber frame batt semi-rigid insulation installed between 140mm timber frame
  • Photon Foil vapour control layer to inside face of frame
  • 38mm Service battens to inside face

U-values supplied by TSK Ltd, calculated by the SIG360 Technical Centre