I was gonna use the same insulation until i accidently got too close to a pc with a welder and it lit like creasoke in a chimmney. Dont know if yr gonna want that in there. Ebay has ultra mat and no where near as flammable and is light weight too.
Oh crap you would think that stuff would be flame retardant?
I can’t deal with that, I’ll stick a torch around it in the morning, if it’s that easy to light it’s getting returned.
I always carry a fire extinguisher, and hope it never needs used.