Is it okay to build a fire pit with concrete? - Home Improvement Stack Exchange
Do I need firebricks for a fire pit?
Conflicting Information on Fire Pit
Are Fire Bricks Necessary when Building a Fire Pit?
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You should line it with firebrick or (since you like molding and casting things) castable refractory. Edit: on second thought, stick to hard firebrick - most castable does not like to get wet. Regular concrete is prone to spalling & cracking in direct fire exposure.
Depending on the shape of the "pit" a 2" layer of sand can work, if it will stay put (ie, if the "pit" is rather shallow)
Concrete blocks should NEVER be used for firepits. They can explode and cause serious injury and/or death. Always use firebrick or cinderblock for fire pits.
Okay so I have a 5’ by 5’ square sand patch of land I’m turning into a fire pit
I’m putting down gravel and then paver base. So I’ll have the layers of sand, then 2” of gravel and then 2” of paver base.
I’ll then be building a circular fire pit out of retaining wall blocks that are trapezoid shaped
I’ll leave about a 2” gap all around then in the center I’ll put a fire ring that’s 35”.
I’ve read some say fire bricks are super important.
Should I be incorporating fire bricks or am I fine? If I do need them, would I only put them under the fire ring or under both the fire ring and the circular stone walls?