i have been kicking around several plans/ideas on how to attempt facing my interior chimney in stone. i would like to build a hearth on the first story and wrap the chimney in stone. being a corner chimney i am faced with some challenges as far as design and space. am i required to frame out and leave an air gap, attatching it to cement board or adhere directly to the block? if framing is required is it strictly steel? anyone seen something similiar done?