Insulating under metal roof?

Been told that to insulate between the joists under a metal roof, the metal must first be covered with foam either sprayed on or in sheets and then fiberglass insulation under that. Another person told me that there must be minimum one inch air space between metal and fiberglass and no foam. What is proper method for doing this? Joists are 2x6 with 1x6 furring strips a foot apart and metal screwed to furring strips. Soffits and peak well ventilated.
Bob
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rck wrote:

If the the area is well ventilated, why do you want to insulate under the metal roof. You should be spending your effort above the ceiling of the floor below.
--
Joseph E. Meehan

26 + 6 = 1 It's Irish Math
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Is it a heated space, insulating to the deck sould not cause harm. Unheated , insulate the floor and vent the attic
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When completed it will be heated in winter and a/c in summer.
Bob
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Because the area under the roof is going to be insulated, drywall, occupied. The two differing opinions came from a contractor and from a home inspector. Of course that in itself doesn't mean either one was qualified to speak authoritatively on the subject.
Bob
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