underlay and decking required?

Edward Ake
I have to install a metal tile roof for a new construction in a tropical / coastal environment. Design calls for exposed rafters with sheet rock in between. Above the sheet rock the plan calls for solid insulation (Polystyrene) battens and then the metal roof. Is there a need for decking and/or underlay or is the design adequate? Thanks for your help
Todd Miller
Isaiah Industries, Inc.
I would recommend decking and underlayment, to avoid condensation. I also would suggest you consider aluminum as an option over steel since you're in the islands. I know that the following MRA manufacturer members make aluminum tole facsimile products: ATAS International, Metal Sales, Classic Metal Roofing Systems.
Eric Novotny
An informed customer is the Best Customer!
Do you mean battens or baffles? +1 on running aluminum. That is a must.

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