hi, i am starting my new build and will be fitting a charnwood cove 2 woodburner,due to the space available we would like to have a fireplace with external brick chimney.i have a 150mm cavity with overaul wall thickness of 350mm. i will need 350mm free space for clay liner and insulation which gives me a projection outside of 700mm and the chimney above first floor level will have to be at least 1000mm wide due to 350mm +350mm+ 300mm diameter for clay flue & insulation.is there another way of building the chimney ?

regards
gareth knight

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