My loft has plenty of insulation under the floor which does a splendid job of keeping heat in the house. The problem is that the loft gets very cold in winter; sub-zero temperatures are not unknown.
I'd like to put some insulation under the roof itself to try to prevent the wost extremes. My thought was to put some kind of fibre-based or polystyrene batts between the rafters, covered with sheets of thin ply.
Directly under the tiles is a membrane of bitumen/paper layers which is mostly sound, but in places is holed or torn.
Are there any condensation/ventilation issues which should concern me?
I'd like to put some insulation under the roof itself to try to prevent the wost extremes. My thought was to put some kind of fibre-based or polystyrene batts between the rafters, covered with sheets of thin ply.
Directly under the tiles is a membrane of bitumen/paper layers which is mostly sound, but in places is holed or torn.
Are there any condensation/ventilation issues which should concern me?