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I'm a beginner potter and I've tried wood firing pottery outdoors because an electric kiln is not very accessible for me. My small kiln is about a bit bigger than 2'x2'x2' and made from regular red bricks with a regular grill grate halfway to place pottery. As you can probably tell, it has terrible insulation and I can never get it to a high enough temp to fire glazed pottery. I can bisque fire and it works but It never gets hot enough to melt glaze, even the low fire glazes I use. I really don't want to ditch this project because I've already put so much time and material into it but I don't have the time/material to build a much bigger kiln or spend days firing. I also don't have a huge budget. What fairly inexpensive materials I can use to insulate my small kiln so that it can comfortably reach cone 06 and complete a glaze firing? I've looked into getting ceramic fiber board to line the inside of the kiln with, fire bricks are very expensive and probably out of my price range. Any advise from someone with more experience in this field would be very appreciated, Thank you!