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

Closed-cell spray foam and fiberglass combination system in exterior wall

Rocco Risbara III | Posted in Energy Efficiency and Durability on

I am building a new home in zone 6 and am considering using 1″ of spray foam insulation on the inside of the wall sheathing, and then filling the remaining area with 6″ fiberglass. Wall framing is 2″x6″.

I am looking for some feedback on using this method. I would appreciate your thoughts.

Thank you.

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.

Replies

  1. GBA Editor
    Martin Holladay | | #1

    Rocco,
    In Climate Zone 6, I wouldn't use less than 1.5 inch of closed-cell foam for this type of flash-and-batt installation, and 2 inches would be better.

    Here is an article on the topic:
    https://www.greenbuildingadvisor.com/fine-homebuilding/why-flash-and-batt-makes-sense

  2. Rocco Risbara III | | #2

    Thank You!

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |