Putney roof insulation

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. 

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Original insulation showing the gaps and missing sections

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.

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Starting to insert insulation between the rafters. Still some gaps to fill.

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

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100mm of rockwool going between the rafters in the eaves storage area.

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.

One Reply to “Putney roof insulation”

  1. great blog mate ,you really know how to go into fine detail when explaining the job you can almost picture the work lol . i se you have had th blog along whil so plebty of practice 🙂 bookmarked !

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