Our backyard firepit. 1. Dig a square hole six inches deep. 2. Fill flat layer of landscape gravel. About 3 inches deep. *** Use fire resistant cement in tube to glue each layer. Just put in top. No need in between. 3. On top of gravel use rectangle, flat pavers (16) to line edge of whole; flush with ground. 4. Each layer is 16 rectangle block payers interlocked. Three layers tall. 5. Top with 16 flat, rectangular pavers slightly of edge. Two square pavers create extra space.