Steel roof/dow styrofoam insulation


I was planning in the not so near future to put a new roof on the ol' doublewide. I was thinking of stripping the shingles, putting down an inch or two of Styrofoam with steel roofing on top.
Dow tells me: STYROFOAM (TM) Extruded Polystyrene Insulation has a maximum use temperature of 165 F. Please assure that adequate ventilation is created between the insulation layer and the metal roofing so that the temperature will not exceed 165 F.
Also I've had some ants that like to nest inside a foam insulated steel door, leaving the insulation outside on the ground. They said: "Design your new roof in such away that the insulation is encapsulated in metal or treated lumber that will deter ants."
I don't like the idea of not being able to walk on the new roof. And I have no idea how to ant proof an entire roof area. Ideas?
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What are you doing about the ants in the fiberglass insulation in your walls, so you get a few ants in the foam, thats life.
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ransley wrote:

Evidently you never saw ants like I had. Maybe you will be lucky and never see them.
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polyiso is better than Styrofoam, especially for roofs. It can be had in many different thicknesses. Most commercial installations have the iso bonded to plywood that is the substrate under the metal roof and the roof is quite walkable.
Here are some sites for more information: http://www.google.com/#hl=en&source=hp&q=polyisocyanurate+insulation&aq=2&aqi=g10&aql=&oq=polyiso&gs_rfai EuDgxxRTPDUBoL-jQOR2r2zDQAAAKoEBU_Q7_Si&fp14b87ebbb573e6
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DanG
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