We did a live test to figure out if Rockwool bats could be used to protect wood from a bonfire on top. 15 cm worked. But the cellulose in the bats made them burn and collapse early.
Bonfire on Rockwool bats
![Bonfire on Rockwool bats](/content/images/size/w2000/2019/11/bats.jpg)
We did a live test to figure out if Rockwool bats could be used to protect wood from a bonfire on top. 15 cm worked. But the cellulose in the bats made them burn and collapse early.