The first stage of this project was replacing the insulation in the sloping roof of the dormer and adding storage to the eaves. The loft conversion has been done reasonably well and the flat roof area and rear wall properly insulated.
However the existing sloping roof was not so successful. Polystyrene insulation had been installed between most of the joists, but not all, not sure why but they had missed some areas leaving big gaps in the insulation envelope.
We replaced the 50mm of polystyrene with 50mm of KIngspan between the joists to create an airtightness barrier we filled all the gaps with Isocynate free expanding foam and then taped
them with aluminium tape. Then we added a further 50mm of insulated plasterboard below the joists.
Many loft conversions leave the eaves storage area uninsulated and the doors can prove a weak
point with the wind whistling through them. We had already added rockwool to the floor area and we took the wall/roof insulation down to meet this and insulated the end walls as well creating a ‘warm’ storage area.
I am currently refurbishing this gorgeous two bedroom flat in Putney. The client is very keen to improve the performance of the house and I am working on the structure to ensure it will be warm, airtight and condensation free for the future. A Parity Home Energy Masterplan has also been carried out for the property and we are using this to inform the refurbishment.
The flat is spread over two floors with two roof terraces and the top floor is a loft conversion, this means there are lots of different types of construction and different opportunities to add different insulation types suitable for that construction.
We are also working very hard to minimise the VOC level in the flat and using appropriate
materials to combat this. I have been been checking all the materials before they come on site and consulting with the client to ensure she is happy. We have had to compromise in some areas, for instance the ceiling height is restricted in the loft conversion so we are using PIR insulation to keep as much space as possible, we have managed to source Isocynate free expanding foam to fill the gaps though so won’t be adding anymore chemicals to the air in the installation.
I will be adding updates and photos as this fascinating project progresses. I will mark them all #putneyretrofit