Often yes. Many jurisdictions allow a metal roof over one existing layer, and doing so avoids tear-off labor and disposal fees. Whether it is appropriate depends on local code, how many layers are already up there, and the condition of the deck underneath.
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It removes a real line item and adds a real risk.
| Going over | Tearing off |
|---|---|
| No tear-off labor or disposal | Both are charged |
| Deck never inspected | Deck seen and repaired |
| Existing layer adds some insulation | Clean substrate |
| May need furring or underlayment over shingle | Underlayment straight to deck |
The saving is usually a modest share of the job. what drives a metal roof quote puts it in context.
Four questions, and the answers should be specific.
A roof meant to last decades sitting on a deck nobody looked at is the risk you are accepting. what the components are called covers the full sequence.
It can affect the manufacturer warranty for some systems. Ask which product is quoted and what its installation instructions require.
Tear-off and disposal, which is usually a modest share of the total rather than a transformative saving.
It can telegraph the shingle texture through a thin panel. Furring strips or a heavier gauge reduce that.
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