With a bit of patching, yea shingles can probably be 30. Unless air circulation is bad, then 10. I worked on one re-shingling the west side, when the east side looked good as new (10yo roof, iirc). Just some weird airflow on that side (neighbours house maybe).
From what I recall, shingled roofs are usually “30 year” roofs, and slate roofs are “100 year” roofs.
It’s all 2 year roofing, max, down here in hurricane land.
With a bit of patching, yea shingles can probably be 30. Unless air circulation is bad, then 10. I worked on one re-shingling the west side, when the east side looked good as new (10yo roof, iirc). Just some weird airflow on that side (neighbours house maybe).