[stuaxo]

There's a company doing one based on plasma treated sheep's wool that looks good (if a little pricey).

Their pitch is that unlike other sheep wool based insulation theirs doesn't have issues with insects moving in, I guess the high heat means it's not edible and absorb water any more.

EDIT: Isolena in Austria is the company.

They seem to be one of the only ones whose insulation is purely wool and doesn't have a bunch of recycled plastic in it as well.

Heritage House has an (opinionated) article:

https://www.heritage-house.org/stuff-about-old-buildings/ins...

Edit 2: It's Plasma treated not heat treated.

https://www.lehner-wool.com/en/brands/isolena.html

[CRUDite]

There is a company called woolcool in the uk that produces wool sheets to replace styrofoam. The sheets are encased in thin perforated plastic. As as insulator it’s great, but it does get wet and it’s expensive. There are companies using it to deliver temp sensitive goods but if you do you have to get your customers to send it back to you to mitigate cost. No one talks about this and finding out the % of packaging returns is information no one volunteers. So you have to get them to return a box full and they also have to hang it over a chair or something to dry it out.

Strip it out of the plastic and a dog or cat will go nuts rolling in it!

WRT house insulation What happens if it gets wet. Moisture is mentioned in the article briefly but not really addressed properly.

The mushroom product doesn’t have any info on thermal insulation properties. Which is the key market. As someone else mentioned, it’s vague