...cuz I heard that certain rocks explode. --but marble is metamorphic, which is stable.i have 2 pieces of marble I'd love to incorporate into my coming cob oven. I also plan to use fire bricks. Thoughts?
I am using soapstone--got some scraps from the Habitat Re-Store for a song, cheaper than firebrick.
I think marble will crack along the grain lines. But if it is bedded well, it will be a stable crack in the floor but still usable.
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Location: Currently in Lake Stevens, WA. Home in Spokane
posted 7 years ago
...cuz I heard that certain rocks explode.
I don't know about granite, but I have always heard not to use river/creek rocks for fireplaces. Through the years, river rocks can absorb a fair quantity of water. If they are then placed next to a heat source, that trapped water can quickly expand, often enough to explode.