Volatile gas explosion- Hearthstone

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Yes, the stainless splines were there. They seemed pretty well cemented into the center stone so I left them in place, and buttered the joint underneath them. We’ll see how it holds up the rest of the season. My mud was Heat Stop, leftover from a masonry firebox rebuild. I’m just happy that we are burning again and not waiting 3 weeks for parts from Hearthstone. I’ll look into their mud this summer.
 
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Put just about any combustible on to hot coals with little to no air and you'll get a build up of gases . . . just waiting to get hot enough to ignite and them KA-BLAM . . . results may vary, but typically there will be a bunch of smoke coming out of the stove, stove pipe, etc. and while not common, there can be damage to the stove or stove pipe.

It was cardboard for me.

It's an easy fix though. Leave the air control open when adding fresh fuel. I typically leave my door ajar as well . . . but that's mainly because I'm the impatient sort who wants a fire sooner rather than later.
 
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