Home owners are delaying re-roofing their homes because modern safety requirements have made scaffolding an additional cost to factor in when re-roofing which inflates the cost substantially.
Many homes built before 1970 will have roofing systems that are at or near the end of their service life. Your Dunedin building inspector will make a determination upon inspection as to the type, condition and expected service life of the buildings roofing system.
Above, corrosion at penetrations and overlaps is common in older iron roofs. This area will leak so it needs to be replaced.
Above, an example of poor design. The chimney directly connects to the roof causing a ponding area found during building inspection. This has caused the framing below to rot resulting in costly repairs.
Above, an older roof is still in good order and with repainting will serve the building well into the future.
Above, the roof is reaching the end of its service life. These concrete roofs can be re-coated or resealed to extend their life but consider the economics and look towards replacing with steel/iron.
Above, Decramastic (pressed tin) roof is at the end of its service life and needs to be replaced. Some of these pressed tin roofs from the 70's contain asbestos resulting in costly removal.
Above, a professionally installed new roof can be expected to last about 50 years.