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Ooh, I shiver when I hear vermiculite, here in NA it has a nasty history of asbestos contamination and associated lung sicknesses. I think pretty much all of the nasty stuff originated from a mine in Montana.
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Has anyone here back-filled a cast iron fireplace with vermiculite?
Yes.
Not just loose vermiculite tho, It's mixed with a slurry of cement/water which solidifies it.
(I couldn't tell you the ratio tho, it was ages ago and we pretty much winged it.)
withered_preacher
sausagefingers
@rodabod
Has anyone here back-filled a cast iron fireplace with vermiculite?