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Cracks In The Kiln

I suppose some of you have found cracks running across the entire bottom and several smaller cracks in the bottom of your kiln and wondered how to repair it.



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Kiln image from Paragon Kilns

Cracking in the firebrick bottom is usually nothing to be concerned about and no repairs are needed in most cases. The bricks expand with heat and the cracks come together tightly.

Check out the galvanized sheet metal base plate under the brick bottom. You can check it with a mirror and a flashlight. As long as the base plate is sound, the brick bottom cracks are nothing to worry about. If the steel base plate is falling apart with rust, you can replace it, or slide a piece of galvanized sheet metal under the kiln. It would fit between the kiln bottom and the kiln stand.

It isn’t necessary, but you could also place a kiln shelf in the bottom of the kiln. Some people place the shelf directly against the brick bottom and others raise the shelf with 1 1/2 inch long, 1 1/2 inch wide posts.

If you use silica sand on the kiln shelves be careful not to allow the sand to seep onto the firebrick bottom because the sand will get into the cracks and widen them. This is why it is not recommended that you use sand on the firebrick bottom.

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