First, thank you for this forum, and for any input received from my post. We have heated strictly with wood for almost ten years, but we have never installed a stove or piping ourselves, only cleaned the pipes. Our tiny home of three years is heated by our wood stove. We do not have any other alternative heat source, nor a furnace. Friends built the addition to our home and installed our stove a little over three years ago. We clean the pipe with a chimney brush monthly from September through May. The past few days, creosote is running down the outside of the pipe that is inside the house, between the ceiling and the stove. The exterior pipe looks fine. Also, this fall we had resealed around the pipe where it meets the roof. I appreciate your thoughts and suggestions to help us figure out what is going on.