Insulating Metal-Framed Building
I have a metal framed building that I will be using as a shop and am in the process of figuring out my insulation. Right now it’s just framed and not sheeted yet. The roof will be metal panels along with the walls. Eventually I would like to frame in a portion of it for some office space/living space. I live in climate zone 5a. My heat source is radiant heat flooring with an insulated and vapor barried slab.
If you can let me know if my idea sounds good or not that would be great. My plan is to sheet the roof and walls with 1″ foiled faced polyiso board. The metal panels would be screwed through the boards into the metal purlins.
Would the 1 1/4in ribs of the metal panel be enough for an airspace or would I be better off facing the foil towards the inside of the building? With me framing this in eventually there will be a small portion of attic that is created. All taped and sealed as well.
I also planned with a large amount of left over of 2in eps board to cut and fit them into the metal beams/purlins to create a barrier to help with possible condensation of the cooler metal. Or would the polyiso create enough of a thermal bridge to the interior metal?
Eventually with part of it being framed and heated I would like to add additional insulation, most likely blown in. Would it better to have the insulation blown into the void between the metal purlins/rafters or to blow it against the ceiling joist?
Any help would be greatly appreciated or possible changes to my plan.
Let me know if you have any other questions.
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