Select a clear, open spot at least 10 feet away from fences or trees. Mark a circle around 4 feet in diameter.
Dig a hole approximately 12–14 inches deep, ensuring the bottom is level.
Pour a few inches of sand into the base to improve drainage and protect the ground from high heat.
Place your cinder blocks in a circular or octagonal shape inside the hole. You can adjust their alignment so they fit tightly together.
Insert metal sheets along the inner wall of the pit to serve as a heat shield. Make sure each panel overlaps slightly for full coverage.
Fill gaps around the outer edge with soil to stabilize the blocks. Then smooth out the surrounding surface for a polished finish.
