Can you avoid tearing off your old asphalt shingle roof by putting a steel roof over it? Maybe. Most codes now allow no more than two layers of roofing before requiring a complete tear-off.

Clay roofing is more complex to install, so there’s no question that you will need a professional to get it done right. Several types of shingles fall under the metal category, with steel and ...

They’re also the simplest to install and won’t require any ... on the condition to which it is exposed, but under normal use, a metal roof can be expected to last more than half a century.