I put in a new Blaze King Princess this year and have noticed quite a few large icicles forming around the cap. Does anybody know what is causing this and what to do about it? I'm going to go up on the roof tonight and pull the cap to check the creosote in the stack. I've had it running for 2 weeks now non-stop and it works great. I've cleaned out the ashes once in that timeframe and will do it again today. My stack is about 6 feet of the single wall in the main room and then it penetrates into the attic and through the roof for 18 feet (double wall stainless). The wood isn't green, and I've been checking the stack daily to make sure that it's not blocked at the top. I appreciate any ideas or help. Maybe it's just something I'll end up knocking off every few weeks.