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I am attracted to the idea of using inexpensive corrugated galvanized metal roofing material to side my new house. I think it would go well with the modern architecture and the wooded setting. I am a longtime, faithful reader of Fine Homebuilding but am (forgive me) still confused about the insulation/venting/moisture barrier issue. Here in the humid Pacific Northwest it is normal to install a moisture barrier on the inside (facing the heated area) of the building with a permeable moisture retardant layer, like a house wrap or felt paper under the siding on the exterior. If I were to use galvanized metal for siding material, would It be required that I provide a venting space behind the metal? I am imagining something like "Rain Screen". A contractor friend of mine suggests that I only need to install felt behind the metal. Any Ideas out there?
Edited 9/25/2009 12:41 am ET by Desert Sage