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

Air krete permeance measurement

user-1042388 | Posted in Green Products and Materials on

I am an electrical engineer, and I am designing a house for myself. I am comparing materials for permeance. I saw this perm rating document for air krete:

Please show me the math to convert the result in this document to units of US perms.

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
    Martin Holladay | | #1

    The test report you linked to is a test for "water permeability coefficient" -- a rarely performed test, I think, that I have frankly never heard of. It is NOT a test for water vapor permeance.

    The last time I spoke with R. Keene Christopher, the CEO of Air Krete, he told me that he had never had Air Krete tested for vapor permeance. However, it seems clear that the product, being cementitious and somewhat crumbly, has a high vapor permeance.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |