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I have steel roofs on the house and upper cellar house. what is the best way to insulate these?
Does any special consideration need to be taken for condensation?

Air flow?
They both have ridge venting and venting at the eaves.
 

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Are they fastened on strapping or directly to the subsurface? You're supposed to leave an air gap with strapping but I have both and don't notice an appreciable difference. As long as the steel can cool moisture won't be a big problem, so power venting the atic might be a requirement. The attic space in my house is 6 inches of fibreglass and 8 of blown insulation. Its been fine every time I have checked and the steel on my roof is screwded directly to the plywood subsurface.
 

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Discussion Starter #3
Ross said:
Are they fastened on strapping or directly to the subsurface? You're supposed to leave an air gap with strapping but I have both and don't notice an appreciable difference. As long as the steel can cool moisture won't be a big problem, so power venting the Attic might be a requirement. The attic space in my house is 6 inches of fiberglass and 8 of blown insulation. Its been fine every time I have checked and the steel on my roof is screwed directly to the plywood subsurface.
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There is no subsurface, the steel is mounted directly to the roof beams, which are rough sawn hardwood 2x6's (real 2x6's). Venting the attic makes sense, I have to run power through there anyway. There's a guy here who advertises in the Green Tab ( a local recycler/penny saver type rag) a blown on foam treatment for steel roofs. Have you heard anything about this?
I'm imagining it's something like "Great stuff" but on a larger scale.
 

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the sprayed urethane foam you mention is great stuff - no condensation, fantastic r-value, awesome adhesive qualitiers - downers - expensive, noxious fumes if burned, difficult to replace roof sheathing
 
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