Originally posted by egalecki
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... until it cracked.
As I suspected it might, the maple cracked on both sides after I left it on the hot oven overnight. It's still holding together and works great, but it's not as pretty. The side with the insulation and Durock is like new. Overall, I think the design is good, but a solid piece of wood was a bad choice. This weekend I want to try making one with some heavy-gauge sheet metal and see how that goes. I definitely like the idea of using insulation board encased in cement, though; I just need something more durable on the other side.
Daren





Les...
Now that my dome is clear, I'll take a closer look. I was limited to doing short fires in the evening (2-3 hours each day), over a 2-week period, after first allowing the mortar to cure for 2 weeks. So for 2 weeks, I was able to do a fire almost every day, starting at about 200 degrees and working up. After about 9 days, I was able to keep a 500-degree fire going for 8 hours on a Saturday. All the cracks showed up in the first 2-3 days. I'll always be wondering if I did something wrong on those days. The first crack was along a horizontal mortar joint, about 5 rows down from the top, so maybe the first newpaper fires should not have been centered in the oven, but rather placed on the side? I'm not sure.
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