Why wont Insurance pay is more the point. If it's a failure to meet contractual obligations I'd pay a visit to the Guardia Civil and issue a "denuncia".

I'd be VERY surprised if a town hall repairs a PRIVATE roof. If the property belonged to the town hall - i,e it's sort of a council home - then that would be different, naturally.

The only way I can see that happening would be if there's some form of special grant/assistance. Either local/regional or national. It's not my area but I've chatted to our Architect and he's not aware of anything either.