To build a propane fire pit, install a propane regulator in the middle of a concrete base after building a fire pit in an excavated area. Connect the copper tubes of the propane tank to the regulator, and connect the regulator to the gas line.
- Mark off the area
Decide where you want to install the pit, and mark off the area with spray paint.
- Excavate the area
Excavate the area with a backhoe, and level it with a landscaping rake.
- Cut and build a frame
Cut four 2-inch by 4-inch boards, and nail them together to build a 5-foot by 5-foot frame. Install two additional boards into the ground with a mallet at each corner to support the frame.
- Install a propane regulator within a concrete base
Mix quick-set concrete and pour it into the frame. Connect a propane regulator to the copper tubes that connect to the propane tank, and install the regulator at the center of the base.
- Finish the base
Screed the base until it's smooth and flush with the top of the frame. Allow the concrete to dry, and take down the wooden frame.
- Build a sub-base
Use mortar and a trowel to create a sub-base with cinderblocks on top of the edges of the concrete base. Do the same with cap blocks on top of the cinderblocks.
- Return the dirt
Return the excavated dirt to the area around the fire pit.
- Add decorative stones
Use the same mortar and trowel technique to build a decorative stone exterior around the fire pit, and top the exterior with cap blocks of the same style.
- Install the gas line
Use thread-seal tape to connect the gas line to the propane regulator.