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So we had our first meeting with the designer last week and when I asked about the u-value for the walls he said he had calculated it to .22 with a 125mm thick full fill mineral wool, block inner and outer, render finish, plastered inner walls. I stated I wanted it to be lower and asked about the advantages of using a foil faced eps. He then said if we used a foil faced then we need to leave a gap i.e. not full full?? Is this right? For example, using the Concrete Block Association Website u-value calculator a medium density block inner, plaster finish, brick outer with 150mm foil faced full fill cavity gives a figure of .15 which is more like the figure I was hoping for. Just found his comment about the gap was a little strange as it contradicts all my research, but he has me thinking I've missed something now? I was just curios to anyone's thoughts on the point to see if they had heard similar?
