I followed the advise on curing very carefully and last night decided that it was time to crank it up a bit. Now I have cracks!
The largest is about 1.5mm wide and had a small amount of smoke coming out of it. The rest are hairline and don't seem to go all the way through.
What do I do now? Should I cut out as much as the mortar as I can on the big crack and refill it?
The cracks closed up a lot as the oven cooled but the big one is still visible. Note that I haven't put the insulation on yet.
cover it up and call it good. Following the curing process has never been a guaranty that cracks will not happen. If you are only seeing 1.5mm cracks consider yourself lucky, trust me, there have been far worse.
Yep. What Les said. Insulate and press on.
Agreed. Ignore them. They don't matter.
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