I lived in a '60s built house that had concrete tiles on a shallower pitch than the nearby '50s houses. The battens rotted. The roofer who replaced them explained that in his opinion it was because of the shallow pitch and the small overlap. He re-used(nearly) all the tiles apart from those broken in removing them and added another row to increase the overlap. He said that as they'd lasted sixty years, there was no reason they shouldn't last another sixty. We were the third house in a development of a dozen or so to have this done.
In my local area I can see numerous houses of similar age that have had this work done, including about half that have had all new tiles.
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