I've had a new 2-stage American Standard Freedom-80% furnace installed in mny home. At the same time, I had a brick mason tuck-point the chimney, install a flexible (aluminum?) chimney liner, and pour a concrete/vermiculite mixture to fill the gap between the liner and the brick. The furnace contractor hooked the exhaust duct to the 5" diameter chimney liner "stub-out."
Every time the furnace runs, condensation forms and drips out of the exhaust duct (just about where it meets the chimney liner). The flu/liner has been checked and is open top to bottom (i.e., no pinches or obstructions). Furnace contractor believes that the vermiculite insulation may have changed the thermodynamic properties of the liner, making it cooler than it should be. I'm not convinced. We live in Seattle where nightime temperatures only dip to 50 degrees this time of year.
Anyone have similar experience with the type of furnace we have (2-stage American Standard-80) or with the vermiculite insulation?
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