I'm in the process of installing a DV gas fireplace in my basement in a bump out in the foundation used to house a fireplace on the main floor.
Because of that upstairs fireplace termination coming out on the main wall of the bump out, I've chosen to locate the termination of the basement unit on one of the 2 ft side walls of the bump out, just above the foundation in the rim joist. To get the specified 1" clearance to combustibles for the 8"/5" concentric flexible vent pipe, I've had to remove drywall, insulation between studs about 16" down from the top of the foundation insulating wall. This has given an excess of clearance in most areas except near the pipe. I'd like to re-insulate the bare concrete wall (reside in central Alberta, -18 C this morning) to prevent frost/condensation forming on this above grade foundation wall. Any suggestions on what system/ combination of material to use? Is spray foam or Styrofoam SM type insulation advisable in the vicinity of vent pipes? I appreciate any and all feed back.