After all the work I went to last year in re-sealing the chimney collar on my narrowboat, I was disappointed during winter to find white grungy muck dribbling down the flue inside the boat onto the top of the stove.
Upon inspection it appeared that muck from the fire fumes was condensing on the inside skin of the outer leaf of the chimney, and falling back down into the collar, forming as crud on the sealant ‘twixt collar and flue.
This was down to a badly fitting and broken chimney in which the inner leaf had come apart. Rather than buy an off the shelf replacement which might also not have fitted well, I opted to get a custom-made replacement.
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