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Fire Pit on Pressure Treated Decking

Despite the growing popularity of composite decking, many decks are still built with Pressure Treated decking boards. With some of my tests, the PT decking would turn a darker brown and char a little under heat that would be starting to melt the polymer cap on composite decking. However, when a fire pit gets really hot underneath, wood can actually come close to catching fire.
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For this test, I used an imported fire pit with an enclosed base. The enclosed base traps heat, and the heat an build up a lot with not ventilation. Fire pits with legs that allow air flow under the fire bowl will damage decking, but not as much as this kind of fire pit. I kept the fire well fed with logs to maintain a robust fire for about 2 hours.
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The next day, when I took the fire pit off the deck, there was well defined circle of damage. The close up was taken from a different angle. This is the kind of charring that could actually start a deck fire. Again, not all fire pits generate this much heat underneath.
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