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Encapsulating an Unvented Attic

Austin G | Posted in General Questions on

My attic has poor ventilation and while it performs well(ish) in Kansas winters, the upper level is hot in the summer.

I encapsulated my crawl space and the difference was stunning.  I want to do the same to the attic… BUT there is currently 2-3 inches of closed cell foam between the roof joists.  Would I need to remove all of this?  That would be a job.

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Replies

  1. GBA Editor
    Kiley Jacques | | #1

    Hi Austin,

    I’m giving your question a bump. While you wait for experts to chime in, take a look at Joe Lstiburek’s answer to the question “Is it problematic to encapsulate wooden framing components in foam?”

  2. Austin G | | #2

    Appreciate the bump. Just seems to be one of those things that it’s hard to find information on. I really don’t want to chip away all that foam around the joists. I’m assuming foam on all sides is ok as long as humidity level is kept reasonable- but many articles tend to say otherwise.

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