GBA Logo horizontal Facebook LinkedIn Email Pinterest Twitter Instagram YouTube Icon Navigation Search Icon Main Search Icon Video Play Icon Audio Play Icon Headphones Icon Plus Icon Minus Icon Check Icon Print Icon Picture icon Single Arrow Icon Double Arrow Icon Hamburger Icon TV Icon Close Icon Sorted Hamburger/Search Icon

Community and Q&A

Does the roof sheathing side in the attic space have to be insulated?

C D | Posted in Building Code Questions on

in some rooms in the upper levels there is attic space with an access door. I realize that the walls which are against the liveable space have to be insulated, but does the side with the roof sheathing have to be insulated? This is the side where the roof shingles are attached.

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. User avater GBA Editor
    Martin Holladay | | #1

    C.D.,
    Every house needs a well-defined thermal boundary. In most homes, the attic is outside of this thermal boundary. If that's the case at your house, you have what is called a vented unconditioned attic.

    In a few houses, the attic is inside the home's thermal boundary. If you have that kind of house, the attic is called an unvented conditioned attic.

    In either case -- whether you have a vented unconditioned attic or an unvented conditioned attic -- you need to know where your thermal boundary is. The thermal boundary should be uninterrupted; as airtight as possible; and should include a layer of insulation in direct contact with the air barrier.

    For more information, see this article: Creating a Conditioned Attic.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |