Easy Board Product Testing
Below are some U-Values you can achieve with Internal Insulation and also interstitial condensation risk assessment.
The U-values of the walls on which the Easy Board panel is used are not affected by the integrated service channels. The U-value of uninsulated walls that have the Easy Board panel installed is between 0.22 and 0.23 W/m²K, depending on the precise substrate.
Regarding the risk of interstitial condensation, in all three wall constructions some interstitial condensation occurs between the outermost foil of the product and the 60 mm thick insulation. Assuming the foils on both sides of the thicker insulation board next to the wall substrate are intact and, provided the butted panel joints are taped with a high vapour resistive tape (subsequent to the fixing of the boards to the wall, but prior to the inner insulation and plasterboard insert being fixed in place) as described in the sketch in Annex
C, then the small amount of condensation that is predicted between the cold-side foil of the thicker insulation board and the insulation itself is not significant. Any build-up of condensate all evaporates as the external climate improves, i.e. there is no year-on-year accumulation of condensate. It will nevertheless be prudent to ensure that the fixings that fasten the board to the wall are made of stainless steel.
Results of the U-value and interstitial condensation calculations
|Wall Construction||U-value (W/m2K)||Interstitial Condensation|
|Location||Duration||Maximum Accumulation (g/m2)|
|Brick/cavity/block/ plus EasyBoard||0.22||Between outmost foil and insulation||November to May||2.11 in March|
|Solid stone plus EasyBoard||0.22||Between outmost foil and insulation||November to June||2.82 in March|
|Solid brick/concrete plus EasyBoard||0.23||Between outmost foil and insulation||November to June||2.97 in March|