re: DIY Outdoor fireplace

I’ve had 2 large outdoor brick fireplaces built. Both contractors poured a 4’ pad. Crazy deep.

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How thick did you make the concrete pad it's sitting on?

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Just seeing this.

So, my yard slopes from the house down to the fence. I had to build up the foundation it's sitting on about 3-4 feet.

The initial foundation I made 6 piers that were 8-10" in diameter and went down 3-4 feet. The piers and the foundation were all rebarred and poured together and the foundation itself is ~ 10 inches thick.

On top of that to get to the height I needed I framed it in cinder blocks. I concreted the walls of the blocks and used crushed limestone inside the blocks. I watered that really well to get it settled and then poured a 4-6 inch pad on top of that. The fireplace and the bricks sit on top of all that.