Thermal break and insulation for gas fireplace flue pipe
We are building a tight and well insulated home in WY. It gets very cold here. We are paying special attention to creating a thermal break and insulating all ductwork to the exterior. They installed a “one pipe” gas fireplace and the metal flue pipe comes straight from the outside with no thermal break. I am told that it must have one inch of air around it so we are not able to insulate the pipe. I had suggested stove pipe insulation which is fire proof but contractor says code does not allow anything. So, we then have this super cold metal that will conduct cold into the framed wall area and down to the gas fireplace unit and then out into the living space. In addition to the cold transfer I am also concerned about condensation in winter time when we maintain 30% humidity and 70 degrees. Any suggestions?
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