How much insulation for a steel beam?
How much insulation do I need over a steel beam to stay above the dew point inside the house?
This is new construction in progress, in NC. The I beam is over a door and window assembly and contained within the wall, sandwiched between the sheathing and drywall. However, no consideration was given to insulating it in the design.
I feel the best approach is to insulate it on the outside only and keep it within the thermal envelope. For most of its length I can add as much insulation as I want but a short five foot leaves little room. In this area I want to start with the minimum to stay above the dew point then see if we have the space to do better.
How do I figure this minimum? Thanks in advance for your suggestions.
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