"... she was persuaded to put spray on insulation on the inside by another company. This year she found the insulation has caused massive rotting of the wooden part of the roof and the whole thing now needs replacing."
I understand the spray-on foam insulation has been the cause of huge problems for some householders. As above, a lot of damage can result.
Two things to bear in mind: the presence of the stuff can make a mortgage difficult or impossible to obtain; and removal of it can be massively expensive, whether or not damage from dampness has occurred.
I see a new type of foam is being advertised which is supposedly breathable. I would be very sceptical of it.
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Solar Panels - Strange Call 
Solar Panels - Strange Call 
