GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Plus Icon Minus Icon Picture icon Hamburger Icon Close Icon Sorted

Community and Q&A

Encapsulating an Unvented Attic

1869farmhouse | 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.

GBA Prime

Join the leading community of building science experts

Become a GBA Prime member and get instant access to the latest developments in green building, research, and reports from the field.


  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. 1869farmhouse | | #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.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |