Hi sorry to be Ignorant,Flaunching at the throat of the fire is this where the ash pan would sit :?: . and if so i would make it level with the hearth slide the fire in then fix to wall then back fill through vent opening with stiff cement mix with vermiculite mixed in and not just vermiculite...
hello, iam replacing my gas fire with an open cast back insert we used have a coal fire so everything ok we have had chimney swept and smoke tested, i was just wandering if it would be ok to backfill with vermiculite after fire has been put in ?? and if so how much of it wil i need