Backyard Fire Pit
I understand that some rocks explode when they get very hot and can be very dangerous. I want to go out in the country and find rocks to build my fire pit. How do I know if the rocks I find are safe for this purpose?
fire pits and patio heaters
Backyard Fire Pits and Patio Heaters
Patio Heaters
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You can’t be certain that a found rock won’t explode if heated enough. For starters, avoid any rocks that have been in water for a while. Rocks rounded by water – stream or river rocks – are the riskiest. A good igneous rock is perhaps the least risky, since they are basically solidified lava and impervious to water. I suggest using a pit about 6 to 8 inches deeper and wider than you’re planning. Line only the sides with rocks. Then use sand or the smallest available gravel for the floor. Us more sand or the small gravel to full in or coat the sides. If you are building a permanent fire pit with concrete, then don’t use rocks at all. You can get fireplace bricks at whatever store in your town that sells regular bricks. Use them. Since they are the liner for your fire pit, you can use whatever you want for the rest. Just be sure that the fire bricks protect the rest of the material from the heat. Also, just don’t build a fire too large and hot for your fire pit.
stay away from sandstone and you may be ok…