My house has got 6 dormer windows but the roof space above each one has not been insulated making all of the bedrooms and bathroom extremely cold. The flat-roof space is not easily accessible and certainly not in a straight line. From the closest accessible point in the main roof space there is only very limited access and possibly only a granular material would suffice. What is the best material to use for insulation? Might I need to strip the roof to achieve the objective?
Ideally they should be a warm roof design, presently they are a cold roof design,so you have to be carefull with adding insulation, as you need to leave a space for ventilation otherwise condensation/moisture will build up & cause a lot of problems. Are the dormer sides insulated? And what condition is the roof covering on these dormers.
Something like this would work. http://www.insulation-actis.com/multifoil-insulation/triso-super-10-plus.html