I recently applied 2mm polystyrene insulation to my walls with thermal adhesive. I now feel that 4mm would have been better, can I apply adhesive on top of the polystyrene and then add another layer or will this cause breathability issues as I understand the walls must breathe to stop condensation.
It's just for my living room and this is what I was recommended for warmer walls. My living room is not not big enough to lose 18cm each side. I just would like to know if if put adhesive on top of the existing polystyrene will it affect the breathability.
I removed the existing wallpaper and added the 2mm of polystyrene. This is added to the finished/paint side of the wall. The paper only came in 2mm not 2cm and I just wanted to know if I add adhesive to the polystyrene on top of the existing one laid down will that cause breathability issues.