When installing a thimble into a terra cotta(think thats what they call it) flue liner i have not found a good way to cut a hole in the flue liner. WHen building new you can buy a liner section with a hole already in it.
So far iv been doing it with a hammer drill,but it busts up the liner too bad,instead of making a clean round hole. Even a ceramic tile rotozip bit wont cut these things, and i cant get a diamond blade saw in there so it would have to be some kind of rotary tool.
So far iv been doing it with a hammer drill,but it busts up the liner too bad,instead of making a clean round hole. Even a ceramic tile rotozip bit wont cut these things, and i cant get a diamond blade saw in there so it would have to be some kind of rotary tool.