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Mix and match exterior rigid and no exterior rigid

Rob_Shearer | Posted in Energy Efficiency and Durability on

Hi, I have a detail in a house where we want some exterior wood cladding to be in the same plane as the EIFS finish of the rest of the house. (occurs between some windows, not that that matters.) The wall is 2×6 construction filled with Mineral Wool Batt insulation (R4.1/inch.) We had the EIFS installer put on 1 1/2″ of rigid foam so that we can keep the sheathing warm enough to prevent moisture accumulation on the back of the sheathing (CZ 5).

I believe I am ok with 2×6 walls with batt insulation plus the 1.5″ of rigid, allowing the wall to dry to the inside and keeping the sheathing warm enough to prevent moisture accumulaiton. I believe I am also ok with just the 2×6 wall filled with batt insulation and no exterior rigid, allowing the wall to dry to the inside and outside. The question is, can I mix and match these two strategies without running into problems? See attached detail.

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  1. GBA Editor
    Martin Holladay | | #1

    It looks like your attempt to include an attachment failed.

    From your description, however, I don't think you have anything to worry about, as long as you follow Rule #1: "Pay attention to airtightness."

  2. Rob_Shearer | | #2

    Thanks, Re-attempting attachment. We always pay attention to air tightness :)

  3. GBA Editor
    Martin Holladay | | #3

    That should work. Of course, continuous rigid foam everywhere would provide better thermal performance -- but I guess you are sacrificing thermal performance for aesthetics.

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