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

Any experiences with Wool Life PureWool blown insulation?

KeithH | Posted in Green Products and Materials on


I’m looking into using blown wool for an attic insulation project. 

In looking into vendor options, I tripped over Wool Life (

They claim their wool product is spun in some way resulting in an R-value of 5.8, which is pretty much leading in the wool insulation class?  And leading in blown insulation?

So some questions for the GBA QA:
1.  Anyone have any experience with their product?

2.  Any reason to doubt the R-value assertion?  They provided a ASTM C117 result backing up the R5.8 result for a 1″ product.

3.  One wool vendor suggested removing the old existing fiberglass batts before blowing in.  I think I agree but I’m wondering what others think.


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. Expert Member
    NICK KEENAN | | #1

    I am suspicious of a R5.8/inch rating. Just about all fluffy insulations have an R value around 4/inch, because they rely on trapping air for their insulation power, and still air has an R-value of around 4. The exceptions are the closed cell foams, which have a gas other than air trapped in their closed cells and that gas has a higher R-value.

    Havelock makes a blown-in sheep's wool product and they claim R4.3/inch.

Log in or create an account to post an answer.


Recent Questions and Replies

  • |
  • |
  • |
  • |