Originally Posted by Bludawg
You need to dig the base out 12" deep pack the bottom with sand to 4" lay down some wire mesh( old cattle panels work good ) fill with concrete to a deph of 6", let it set for a week. Lay down fireplace mortar and top the slab with fire brick then start up the walls two bricks wide. frame the openings with 3" angle iron an put "T" channel in around the perimeter at grate height, go up 2 more rows and add a top cap. The lid can be made from 11ga. with a counter weight system.
^^^^What he said^^^^^
These type of pits are common where I'm from (Western KY). In fact we have two mobile pits that we use in competition based on this idea. Our pits are actually metal with insulation. I'm planning on starting a permanent pit behind my house this spring as well.
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