It can be used to pour back down the chimney filling the void between the brick chinmey and the flexible flue liner.
How to use vermiculite in chimneys.
Fitting a flue liner into a chimney for a woodburner or stove.
You have to have knowledge how much and what to use experience how to when to and how long to mix and the placement techniques.
This stuff absorbs and retains water so if your chimney leaks water at all the insulation material will gradually get wetter absorbing like a sponge.
100litre bag of vermiculite insulation for backfilling the chimney around the liner.
This diy project includes pictures of a real installation of a wood burning stove.
Vermiculite is a light weight naturally occurring mineral which is an excellent heat insulator.
We explain how to fit a flue liner into the chimney and insulate it with vermiculite.
Filling between a tin flue and the chimney could be a disaster if the insulation caused the tin to overheat and a hot spot that could easily ignite any creosote.
I have my reservations about these methods.