laserman2024

I have done the same way. 70 mm pir recticel between rafters and 70 mm under rafters taped and plasterboard. BCO also approved. One reservation I have though is risk of condensation between PIR layers. Usuall they say pir thickness on colder side should be larger thsn on warmer. Like 100 and 40 or 50. Did you have sny issues with condesation? I guess it is not easy to check