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konastab01
Spxtz
I'm trying to make our flat warmer in advance of winter, and the coldest room last year was our living room which is on the gable end of the block. The exterior wall has floating stud with a closed-up fireplace on it, but it's super drafty. And the draft doesn't just come out of the fireplace vent, it comes from the alcove cupboards too. So I suspect that the space behind the stud wall is open to the fireplace and all the air behind the wall is subject to drafts coming down the chimney.
I don't want to seal the chimney, as I think this would cause some condensation problems. But would I cause any problems if I cut into the plaster covering the fireplace and sealed around it between the two walls (exterior and floating) so that the chimney air only circulates in the fireplace and out the one vent? Then effectively the rest of the space behind the wall would become dead air and in theory the room would retain heat better/be less drafty. Or would I cause other issues by this approach?
Brown line is exterior wall with chimney, black line is stud wall. I'm thinking of joining the two around the edge of the fireplace (red line) then plastering the fireplace up again.