rossow (mn)
Member
Not a tool, but I know many of you may have experience here, so I hope you can follow my question. I have a new shed-roof addition on the back of my house. I am installing a pre-fab (zero-clearance) fireplace diagonally across one corner. (Imagine a triangle with the fireplace on the bottom leg of the triangle.) I understand the need for various clearances, correct pipe, etc., so no issue there. My question regards insulation. I will insulate the outside walls of the corner. But should I insulate the diagonal wall that encloses the fireplace (the bottom leg of the triangle)? Some sources say no insulation on that interior wall so the fireplace chimney will be closer to room temperature and reduce condensation in and on the pipe. Other sources say insulate the enclosing wall to keep the chimney pipe cold. Which way should I go? (Does this question make any sense? if not, I can re-explain.) Thanks.