You (or an independent person) needs to sit down with the committee and explain the facts of life to them.
The strata scheme is obliged by law to maintain and repair common propery – no ifs, buts or equivocations.
If they refuse, you will take them to NCAT and force them to have it done. If they get lawyers involved, you will seek orders to ensure that they and not you have to pay for legal advice.
So, at the end of the day, they will still have to fix the roof, and they will have been charged legal fees.
And if they still don’t get it, you will apply to NCAT to have them replaced by a strata manager – then they won’t get to make any decisions for a couple of years.
This would be a clear case where our sponsors Strata Answers could step in and explain rights and responsibilities.