You need a metal fire ring or line it with fire brick. The heat will crumble concrete block
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24on48hunting may have some suggestions. He is doing awesome on our fireplace. Pictures to come soon
Thanks, it has been a pleasure doing the install. Thank you for allowing me the opportunity to do so.
Line the inside with fire brick laid in with Portland or Type S cement. Cut back on the sand a bit when you mix it up so that the cement is quite tacky.
To truly disperse a substantial amount of the heat from the pit, you should have a void space between the fire brick and the outer ring. Otherwise the heat just radiates right through to the outer ring.
Cap it with stone or the matching cap stones if available.
Avoid using river sand for the cement too. It has too many rocks in it.
The bagged sand/play sand is no bueno either.
It was a large outdoor fireplace he did for me.