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Old 08-06-2012, 11:26 PM   #1
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underlayment


I'm putting a metal roof on OSB on a shed (16 ft 48 ft) that will have no heat or moisture inside (three sides are open) do I need to put any tar paper or underlayment before I but on the metal roof? Condensation shouldn't be a problem I wouldn't think but I do live in snow country and it will be covered with snow most of the winter. Any ideas?

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Old 08-06-2012, 11:47 PM   #2
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Underlayment is advisable if only from the standpoint of protecting the backside of the metal.

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Old 08-06-2012, 11:58 PM   #3
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protecting the back of the metal from what? Has anyone done this and had a problem rotting the wood because of leaks or condensation. I'd like to save the work and money if I can but it's no problem doing it but why if it is not a problem.
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Old 08-07-2012, 03:23 AM   #4
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Scratches and providing it a proper slip layer to expand and contract against.
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