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TOPIC: Installation

new metal roof height difference

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We are putting a new metal roof over our existing shingled roof and our new addition. The new part is 1 and 1/4" lower than the existing shingled roof. Can we put 1" styrofoam and 1/4" plywood over before the metal roof goes on, or is something else better?

Kara Syreini

9/5/2018
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You would need to make sure it is acceptable to your metal roofing producer. However, I would not use styrofoam as it is too spongy. I'd suggest poly iso board.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

9/5/2018
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Agreed to Todd's recommendation. Make sure whatever foam you use has the right compression strength for roof application.

Eric Novotny
Eric Novotny
An informed customer is the Best Customer!

9/6/2018
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Thank you for the help. I'll look into a poly iso board.

Kara Syreini

9/12/2018
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