"Andrew Dyke" <[email protected]> wrote in message news:c7a03b7711324719973b17417b1d8...@andrewpc... > Hi All, > > The double skin 18 inches high chimney on LT has finally rusted away and > now > lets the tar run out of the bottom all down the boat sides. Not nice. > Replacement is the order of the day and a search provides some answers but > I > wonder if you have any suggestions please. I also need two Cooley (bet the > spellings wrong) hats. > > SNIP> > Look carefully at the replacement chimney. They seem to come in two styles, one where the inner is a tight fit inside the collar (for where the flue stops half way up the collar) and one where the inner is smaller (for where the flue reaches the top of the collar).
The former are usually cheaper in construction with a folded seam on the outer and a parallel inner; the latter are usually made of heavier steel with a welded seam and a tapered inner. If you get the wrong type it will either not fit (inner too big) or will let tar condense between the walls and run down outside (inner too small). If you do get the one where the inner is too small (as we did) you can recover the mistake by filling the gap between the skins with fireproof foam. -- Allan Jones - N/B 'Keeping Up' www.keeping-up.co.uk
