What is the most UV-resistant hydro-windproof membrane?
Who can tell me the most unbreakable UV sun waterproofing membrane?
UV will get there, it's only a matter of time. So as an insurance, you need to take the hard outer layer of rockwool.
If you believe the manufacturer's claims – Isospan AQ proff 12 months.
But I would not recommend leaving any of the membranes open for a long time