Bruce Chan
I have a 2.5 / 12 slope roof,,panels are 16" wide, 1" high ribs,,screw down on panels, fasteners are hidden by the overlapping panel,,no clips used,,.no exposed fasteners,.I am using synthetic underlayment,,do i need to use a double layer of the under derlayment ,or is a single layer acceptable?
Todd Miller
Isaiah Industries, Inc.
Make sure that you use underlayment as required by local building code and also as required by the panel manufacturer. Generally, though, it sounds like a single layer will be fine.

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