The average life of roofing asphalt and fiberglass shingles.
Remaining useful life of a roof.
The remaining useful life of building components and systems is noted in a property condition assessment and is used to help calculate expected short and long term capital expenses required to maintain a property.
Not surprisingly cheaper roofing materials won.
The roof condition ratings should take into account the age remaining useful life and any signs of deterioration.
Wood shingles and shakes.
Remaining useful life is an estimate made by a trained professional who has experience and works in the industry.
Wood shingles and shakes are typically made from pressure treated wood or cedar and are more.
While many types of roofs last longer than 15 years some can hold up well for 50 years or longer barring a serious storm or a large fallen tree.