This was a garage to Annexe conversation to which we installed a Charnwood Country 4 Stove in to a Twin Wall chimney system up through the room above & out the roof, we came when the building was in its first fixing stage & installed black twin wall chimney from just below sitting room ceiling height allowing for plasterboard, we then returned 3 months later & laid new slate hearth, connected up stove & boxed in pipework in concrete board, this making this large garage a very warm & welcoming Annexe for the owner to move in too.