Does anyone know where I can buy some injectable roofing insulation. I'm having a skylight fitted into an existing roof and I've noticed that there is no insulation between the slates and the internal roof. I don't want to take off all the plastered roof, so I was wondering if anyone has seen an injectable version. I don't mind cutting small holes in the roof that can be easily patched, but I'm not going to remove the roof.
Thanks
david hodgkinson