Any experiences with Wool Life PureWool blown insulation?
Hi GBA,
I’m looking into using blown wool for an attic insulation project.
In looking into vendor options, I tripped over Wool Life (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.
Thanks!
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Replies
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.