The optimal size for a fire pit is between 36 and 44 inches inside diameter. That will create enough room for a healthy fire but still keep gatherers close enough to chat. As an added precaution, the fire pit should be lined with a thick steel ring like the ones used for park campfires.
How thick should a concrete fire pit be?
Mix and pour the concrete foundation layer about 3½” thick. Make sure concrete fills all corners and let this layer cure for about 20 hours. QUIKTip: Use a 2×4 on the bottom to make judging this thickness easier.
Can concrete be used for fire pit?
Concrete is made up entirely of non-combustible materials, this lack of flammability makes it the perfect base for a fire pit. What concrete will do is expand when exposed to high temperatures, this could potentially cause cracking.
How many bags of concrete do I need for a fire pit?
We ended up using 20 bags of QUIKRETE in our fire pit. That’s a fair amount of concrete to mix up, especially when it’s 88° and very humid. You can do it by hand in a wheelbarrow, but it’s a whole lot faster – and easier – to rent a portable mixer.
Will concrete crack under heat?
Cracking due to temperature can occur in concrete members that are not considered mass concrete. … In rarer instances thermal cracking can occur when concrete surfaces are ex- posed to extreme temperature rapidly. Concrete members will expand and contract when exposed to hot and cold ambient temperatures, respectively.
How do you make concrete fire resistant?
Things You’ll Need
Many wood-fired ovens, kilns and fireplaces are built with fireproof concrete or other fireproof material known as refractory concrete. Commercially, fireproof concrete is made by mixing a product known as fly ash, a by-product of the production of Portland cement.