Forget about using vermiculite in a diy concrete.
How to use vermiculite in chimneys.
100litre bag of vermiculite insulation for backfilling the chimney around the liner.
Fitting a flue liner into a chimney for a woodburner or stove.
Fitting a flue liner how to fit a flue liner into a chimney for a woodburner or fire.
Vermiculite is a light weight naturally occurring mineral which is an excellent heat insulator.
This diy project includes pictures of a real installation of a wood burning stove.
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.
We explain how to fit a flue liner into the chimney and insulate it with vermiculite.
It can be used to pour back down the chimney filling the void between the brick chinmey and the flexible flue liner.
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.