TOPIC: I Have An Existing Metal Roof and Have A Question
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We are in the process of converting an agricultural steel barn in to a residential home. We are planning on having a composite steel roof (U value 0.16) and would like to leave the roof vaulted. The question I have is will there be condensation?
We are based in the UK and the outer columns of the steel portal frame will be covered in a combination of composite steel cladding and timber. We plan to install a second interior wall (skin) to create a cavity and will insulate further the interior stud wall. The current construction of the outer wall is 4FT high concrete block wall (single skin) with insulated timber stud on top to the roof. My question is as thermal bridging occurs (dont know how to mitigate this) from the outside columns, will this create condensation on the roof as the inside of the house will be much warmer than outside - particularly in winter?
It sounds like you understand the basics -- very basically, warm air reaches a cool surface and condensation results. Thermal bridging can be a culprit as well. I would look at adding a vapor barrier against the living space, beefing up insulation and ventilation, trying to add thermal breaks.
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