The house we are abuilding, is bermed on 3 sides and has a flat roof over 50% of house, we are building warm roofs because of the energy loss ( zone 4 ) . The condition we must guard against is the underside of the roof sheathing reaching the dew point, and causing/allowing rot. So our insulation must be pretty substantial and must be in full contact with the sheathing. I am insulating the flat part now & at 100 deg F am finding it pretty tough to be thinking of snow. Not too worried about ice dams since you could park a semi on the roof. This year the room under the finished part of the roof will not be heated so no worries, but soon we will be too old to tour off to Mexico for the winters so we gotta get ready.
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