MartinMountain

Can I put 150mm glass wool in the void between the rafters above an Intello Proclima membrane and plasterboard?

Hi I'm renovating a property in the French Alps and new roof installation has just been installed above the existing timber structure. The timber joists and planks were existing and have been replaced only where they were damaged by a previous leak. I am contemplating adding additonal insulation in the void between the roof joists but I don't want to cause any issues by trapping moisture. In some areas there is 150mm existing glass fibre insulation in this void with backing paper which I guess I should remove if I leave the insulation in place. Does anyone have any advice? Thanks Martin