Our 2-story cape in Pittsfield, Mass. was built in 2013. The house has spray foam insulation. We have a zero-clearance Kozy Heat wood burning insert, with a fuel pipe that rises through the second floor and exits the house through a dormer roof.
Condensation freezes in our chimney chase, thaws, and drips down the stove pipe. We thought we had corrected the problem by installing a pitched ceiling plate, attic insulation shield and insulation, but unfortunately it is still occurring. The water has found it’s way through a gap around the pitched ceiling plate and is now running down the sheetrock. Neither our contractor nor mason have a resolution.
The chimney chase only contains the stove pipe for the Kozy Heat insert. The pipe passes through a ceiling that has spray foam insulation and exits the house through the dormer roof on the second floor (so there is no attic). There is a 4” space around the stove pipe where it exits the house, and there is also a pitched ceiling plate with an attic insulation shield surrounded by fiberglass insulation at a depth of about 12” above sheetrock.
The chase is constructed of 2x4’s with Zip panels taped at the corners and seams, covered with wire lathe and cultured stone, and the chase cap is stainless. There is no ventilation allowing for air circulation in the chase.
We’re wondering if we should try any of the following options, or something else? And if so, what?
• Remove the pitched ceiling plate, attic insulation shield and insulation during the spring/summer and dry out the inside of the chase
• Add ventilation to the chase area to allow moisture to escape – how would this be done and by what type of contractor?
• Insulate the chase above the roof to make it part of the insulated envelope?
• Other options??