Our house is a 1.5 storey detached, with dormers in the roof, built in 1983. The roof insulation installed between the rafters at that point (rockwool type) met the specifications in place at the time, and the whole roof space was then boarded out for storage. It is a cut roof, fully felted and with concrete tiles. We do occasionally get condensation on the underside of the felt on cool days.
When we bought the house 11 years ago our survey flagged that the roof insulation levels were lower than the specifications current at that point. We are now considering putting the house on the market and Im concerned that potential buyers will be put off, as the level of insulation could lower the EPC level assigned.
Is it worthwhile upgrading the roof insulation before putting the house on the market? If so, what is the best route for doing this? Weve identified a product called Eco Loft, which would provide chipboard bonded to rigid PIR foil faced insulation. I assume that this could be laid on top of the existing boarding, so retaining the current cold roof structure and storage capability, but initial costing of it it seems like a very expensive option. An alternative seems to be to hang thermal insulation foil roll from the rafters, but that would mean moving to a warm roof construction and Im not sure whether that is the correct thing to do given the condensation previously mentioned.
Can you please advise?