Repairing a bitumen roof is ideal for localized damage, like small cracks or holes, especially if the roof is within its 20-year lifespan with proper maintenance. Replacement suits extensive damage or roofs nearing the end of their life. Regular inspections can catch issues early, saving costs, as noted in discussions on roofing forums like Reddit’s r/adjusters. For extensive structural issues, replacement is wiser, per insights from roofing experts.