Considerations for Building a Metal Fire Pit

Looking for a new metal fabrication project? If you’ve been meaning to outfit that patio with a brand-new fire pit, we’ve got some considerations for you. Building a metal fire pit can be challenging, but if you have the right equipment and do your homework, it can be an extremely rewarding way to use your metal fabrication skills and bring friends and family together over campfire stories and s’mores. In this article, we lay out several considerations to build your own metal fire pit.

What Equipment Do You Need to Build a Fire Pit?

Equipment needs will vary depending on what style of fire pit you are going to build, but in general, you will need:

• A cutting device. This could be a band saw or a plasma cutter, but it is not limited to just these devices. Plasma cutters are especially useful because you can cut your own designs into your fire pit ring.
• A welder to join the different metal components together (e.g., the legs and bottom, bottom and ring, etc.).
• An angle grinder or bench grinder outfitted with a wire brush will likely be needed to clean the metal up before welding. A ceramic grinding disc may also be needed to remove dross and burrs.
• Some way to bend metal to form the ring. This could be a brake press or other more creative solutions done with a homemade jig.
• Clamps or magnets to hold the different components together during assembly.

What Type of Metal Should You Use to Build a Fire Pit?

For most pits, hot rolled steel is sufficient. You will need a steel sheet for the ring, most likely around 1/8” thick, but preferences will vary in terms of thickness. Also, make sure the sheet length is long enough to form the diameter you require for your pit and that the width of the steel sheet is large enough to be the height you want. Somewhere around 18-36” is a good starting point for width, but this is a personal preference depending on the size of the fire you intend to have in your metal fire pit.

You will also need to use a metal sheet for the bottom of the fire pit if you are not putting it directly on the dirt. Instead of buying sheet for the ring or fire pit bottom, you can also buy expanded metal, but be mindful that it will increase airflow and create a potential fire hazard, which is another consideration discussed later.

In addition to the steel sheet for the ring, you will also need steel tubing for the legs if you desire to elevate the fire pit off the ground. While not necessary, it can protect whatever is underneath your fire pit from damage and getting dirty. This is especially useful if the fire pit is going onto your patio. Even with legs, it is advisable to have a slab of stone that your fire pit will be put on top of, because the legs can get quite hot because of the thermal transferability of steel. The stone slab will provide the heat resistance necessary to prevent damage to the areas surrounding your metal fire pit.

Can You Build a Fire Pit Without a Metal Ring?

While metal rings are commonly used in fire pit construction, they aren’t absolutely necessary for creating an effective and safe outdoor fire feature. Many well-designed fire pits function perfectly without a dedicated metal ring component.

The primary purpose of a metal ring is to contain the fire and protect surrounding materials from heat damage. However, using heat-resistant materials such as fire bricks, concrete pavers, or natural stone, properly arranged in a stable formation, can achieve similar safety and functionality.

If you choose to build your own metal fire pit without a traditional ring, pay special attention to the structural integrity of your design and ensure all materials can withstand repeated heating and cooling cycles.

How Much Airflow Should a Fire Pit Have?

The more holes or patterns you have in your fire pit ring, the more airflow will be allowed to enter your metal fire pit. This is something to consider as you think about how you want to build it. Increasing the airflow will give your fire more oxygen, allowing it to burn faster and hotter. This can be advantageous if that is what you prefer; however, if you want your fire to burn more slowly, then aim for a lower amount of air flow. As previously mentioned, expanded metal can be used as fire pit ring material, and this typically provides the greatest amount of airflow for a metal fire pit, although large patterns cut into the ring can yield a similar result.

Another way to maximize airflow is to place expanded metal or perforated sheet metal on the bottom of the fire pit where the logs will go. Your fire will burn very nicely, but it is critical that you place a metal basket directly underneath the fire pit and atop the stone slab to prevent hot coals from falling through the metal bottom and potentially igniting an unwanted fire outside the fire pit.

How to Build a Metal Fire Pit: A General Guide

Building your own metal fire pit can be a rewarding weekend project that enhances your outdoor space. Here’s a general approach to help you get started:

1. Determine the size and location of your fire pit. Consider factors such as local regulations, distance from structures, and whether you prefer a permanent or portable design. Sketch your ideas, noting dimensions and materials needed.
2. Gather your materials. For a basic metal fire pit, you’ll need heat-resistant metal sheets or plates for the main structure, metal grating for the base, and, if desired, decorative elements like metal mesh for the sides. Common metals include steel, stainless steel, or cast iron, with thickness varying based on your design. Additional materials might consist of concrete for the base, bricks for the surrounding structure, and hardware for assembly.
3. Ensure your fire pit has proper ventilation for airflow and includes a sufficient barrier to contain sparks. The height should be adequate to prevent fire from spreading but accessible enough for enjoyment. Always check local fire codes before beginning construction.
4. Prepare the site with a level, non-flammable base. Assemble the metal components according to your design, using appropriate joining methods like welding or bolting. Install any drainage features and ensure the structure is stable. Consider adding legs or a stand to elevate the pit from the ground.
5. Add heat-resistant paint, if desired, and install any additional features, such as a cooking grate, a spark screen, or decorative elements. Create a safe perimeter around your fire pit using non-flammable materials, such as gravel or pavers.

While this is not an exhaustive step-by-step guide for how to build a fire pit, it is a great way to think about what you will need and what you will need to do to get started. Once you have weighed these considerations, it is time to begin thinking about a design and the steps necessary to make your metal fire pit dream a reality. Good luck!