i have a cold exterior wall where my fireplace is this wall is adjacent to my garage if you go into the garage up inside the storage area you can see the back of my zero clearance fireplace with only a wrap around the fire place should this area be insulated ??
Sure sounds like it to me. "Cold wall" answers your question. How? Start with calling the manufacturer, and asking what is recommended. Likely, rock wool would be a good bet. You may be framing out a new, short wall.
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