Renew or repair Colorbond house roof?

Job ID: 35012412

Budget: $250 – $750 AUD

Colorbond roof of house is 33 years old and Colorbond is fragmenting. Underlying metal is not rusting yet but bolts holding it on are all rusted. Semi retired painter relative advises painting the roof. Need independent consultant to advise whether to do that or completely renew roof. Geelong area.