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TOPIC: I Have An Existing Metal Roof and Have A Question

Insulate or Not - Metal Over Tin

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Live in an 85-year old house with a ton roof. Roof is fine except where slope meets a flat area over the back of the house. Tired of constant seem repairs & considering metal roof install using the roof hugger system.

Is any kind of vapor barrier or insulation required?

The trouble-prone area of the roof faces south & is currently not well insulated due to the narrow space between structure & tin.

Can I add insulation without worry about deterioration of underlying tin?

Paul Rose
Metal over Tin

6/25/2020
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The RoofHugger folks are great so I really suggest asking them your questions. A vapor barrier typically is placed behind the drywall in a home to prevent moisture from driving into the roof or wall assemblies and condensing. A moisture barrier would usually be part of the roof assembly to prevent rain water from getting inside. Insulation would usually be someplace between the vapor barrier and the moisture barrier.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

6/25/2020
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