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Adding rigid foam to an existing building with faced fiberglass batts

user-1015973 | Posted in Energy Efficiency and Durability on

Hi,
I am wanting to add rigid foam insulation to a double-wide modular home. I am in zone six and the existing building is 2×6 construction with faced fiberglass batts. I want to use 2″ ISO foil-faced insulation with Tyvek on the outside, but will this cause breathabilty issues?

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Related Questions

Replies

  1. GBA Editor
    Martin Holladay | | #1

    Joel,
    No, it will not cause breathability issues. You are good to go.

  2. user-1015973 | | #2

    Martin, Thank you for your prompt reply appreciate it!

  3. Expert Member
    Michael Maines | | #3

    Joel, do you have poly sheeting in addition to the batts, or is the kraft facing the only vapor retarder?

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