Danny Willis : By insulating the clay flue liner you will greatly speed up the rate at which the Clay Pipe heats up! If used as part of the feed tube, burn tunnel or
the heat riser, the clay pipe will heat up/expand unevenly and is likely to crack, The Good people at DragonHeaters, have a couple of adaptations to the clay
tile they use, AND they split the tiles lengthwise and then hold the parts together with Stainless Steel Clamps !
If you are going to use the clay pipe after the barrel, I believe several people Have successfully used the clay tile you would like to use, however soft
red brick works well for me, I am planning on some further exploration of the heat sink qualities of 'Potsdam sand stone'. so I don't qualify as an expert with
clay tile Y. M. M. V. ! Hope this is timely and helps ! for the craft ! Big AL
Success has a Thousand Fathers , Failure is an Orphan