How thick does a concrete fire pit need to be?

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.

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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.

Tame a raging fire