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Rigid Insulation Board on Metal Roof B-deck

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Can anyone direct me to a source on the authority and reasoning behind the NUCOR and SDI language requiring minimum 1” of rigid insulation on a metal roof B-deck?

I have a builder that wants to use a peel-and-stick underlayment attached directly to a 1.5B22 metal deck. A standing seam metal roof would then be attached to the deck.

I expect that the reason relates to providing continuous support for the underlayment, condensation issues and sound transmission due to rain but I would like to see it in black and white.

I have most of the NUCOR and SDI publications but there isn’t much about it.




Christopher Banbury, PE


Ark Engineering, Inc.

PO Box 10129, Brooksville, FL 34603

22 N. Broad ST, Brooksville, FL 34601

Phone: (352) 754-2424

FAX: (352) 754-2412