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

Roofs and Walls: Interior vs. Exterior Insulation

erikdavitt | Posted in General Questions on

I am curious if anyone knows the reason/science behind why the ratio of internal to external insulation is smaller in walls then a roof? For example, in my zone, Zone 6 about 51% of the insulation should be on the exterior of a roof vs 36% for a wall. Is it because walls are less likely to have moisture build up due to condensation vs a roof?

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. MartinHolladay | | #1

    Erik,
    You have double-posted your question. To see an answer to your question, go to the GBA page where you also posted the same question: https://www.greenbuildingadvisor.com/article/combining-exterior-rigid-foam-with-fluffy-insulation#comment-237381

    1. erikdavitt | | #2

      Thanks for your response as to why the ratio requirement is greater in roofs.

      It’s nice to know the reason behind a regulation.

Log in or create an account to post an answer.

Community

Recent Questions and Replies

  • |
  • |
  • |
  • |