My 70s house is part clad in uPVC shiplap. This is mounted to wooden batterns which are mounted to the breezeblock, and then internally this is plastered. I'd like to insulate behind the uPVC as the wall is facing north and north east and is very cold.
Can I fix the celotex type insulation direct to the external breeze block wall, then the cladding over that, or do I need a vapour barrier or ventilation somewhere? To my knowlegde, the cold side will be the exterior of the celotex, directly behind the uPVC so any condensation will be there rather than close to the block work, so this method should be ok.
Also, will I be able to remove the uPVC and refit it, or will it break/weaken etc. so that I'll have to fit new cladding.
Thanks.
Can I fix the celotex type insulation direct to the external breeze block wall, then the cladding over that, or do I need a vapour barrier or ventilation somewhere? To my knowlegde, the cold side will be the exterior of the celotex, directly behind the uPVC so any condensation will be there rather than close to the block work, so this method should be ok.
Also, will I be able to remove the uPVC and refit it, or will it break/weaken etc. so that I'll have to fit new cladding.
Thanks.