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Metal shop / house

harleyrea | Posted in General Questions on

Building a metal shop / house with 2×6 walls in northwest Tennessee. I’m really wanting to do Icynene open-cell foam walls and ceiling, with a proper ERV. Any thoughts?

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  1. Walter Ahlgrim | | #1

    The only good way to insulate a steel building is to put the insulation on the outside and keep all of the steel warm on the inside. The problem is there is no cheap way to keep the insulation dry.

    Steel buildings generally leak so much air ERV would not be necessary.

    You may find this article interesting. Be sure to read the Q&A.


  2. harleyrea | | #2

    I was thinking once the metal was 100% foamed it would be air tight

  3. GBA Editor
    Martin Holladay | | #3

    Can you describe this building a little better? Will it have conventional 2x6 walls? Will the walls have sheathing (OSB or plywood)?

    Will the building's walls have metal siding (cladding) -- steel panels?

  4. harleyrea | | #4

    conventional 2 x 6 wall(no sheathing) with steel panel screw to them, then open cell foam sprayed to fill the wall cavity

    1. Expert Member
      Akos | | #6

      If you don't want plywood/osb on the outside, you can install house-wrap over the studs before the metal panels go up and spray foam against it. This way the spray foam will not glue your metal siding to the building.

  5. GBA Editor
    Martin Holladay | | #5

    For the reasons cited in the article ("Insulating a Pole Barn"), you really need OSB or plywood sheathing. Otherwise, you'll glue everything together, and it will be very difficult to replace a steel panel when it begins to rust.

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