We knew that the volume of material Pegasus, the external insulation system installers, would use was large but seeing the first delivery fill up about half of the volume of the ground floor was still a shock. Another delivery of material is scheduled for next Wednesday by which time most of Friday's material will be installed on the gable wall. Progress will then be slowed down by the need to readjust the scaffolding before the insulation can be applied to the rear walls. Liam and Glenys provide scale in the photo below. the boxes behind Liam contain the mechanical fixings for the 300mm Graphite EPS.



I was pleasantly surprised by the thermal conductivity λ=0.030W/mK - I was expecting a rating of λ=0.032W/mK. This 'small' difference drops the annual heating demand by 44kWh. Yesterday I looked at the VIP panel labels that have been waiting installation for several weeks and was again pleased by the lower than expected rated thermal conductivity. Some months ago I had spent a long time searching for the CE rated U value on the internet without success. The figure I had been using in the PHPP software was 0.0077W/mK which was an aged value supplied by the supplier. The 'correct' figure of 0.0066W/mK which made a saving of over 60kWh/a.



I am anxious to make the most of the Kingspan offcuts and this also reduces costs by reducing the number of skips required. The offcuts are being used to good effect in the weaker areas of the roof space - over the tops of the walls at the rear of the property and the valley between the two roof planes - where the specified fill of 750mm Warmcell 300 cannot take place. Of course the critical areas are the most difficult to reach but Henry doesn't seem to mind.