(edit Most barrels...) won't last very long as fire pits. I know this from burning trash when I was a kid. By the time the barrel was full it was falling apart. I never counted, but I would expect it to work well for about 10-20 burns and maybe 50-60 burns before its paper thin and falling apart.

Edit: The thickness of the metal is what matters. 18 gauge drums are what I find to be the industry standard; 18 gauge won't last very long in my opinion. A thicker drum would last longer. I personally own a fire pit object that is very thin, which probably would not last more than 10 burns. So it goes to show that any ol' manufacturer may not necessarily make a decent product.

I have seen barrels converted to wood stoves. I have seen some of them fall apart and I have seen some stand for decades. This is due (primarily) to the thickness of the steel.

Edit2: Product reviews are probably important when you can't get the actual specifications. Amazon has reviews for the example product that you linked... 3.5 stars is not so hot.

Answer from Ben Welborn on Stack Exchange
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The Home Depot
homedepot.com › diy projects & ideas › outdoor living ideas › outdoor decor ideas & projects
How to Make a Fire Pit - The Home Depot
September 7, 2023 - A fire pit typically has three or four rows of blocks. Repeat the test-fitting for each layer before securing with adhesive. The bowl sits on top and can be removed for easy cleaning. Tip: Refer to the label on your construction adhesive for the proper curing time. It can take between two and seven days for the material to dry, fully cure and be ready handle the heat from your DIY firepit.
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Lowe's
lowes.com › home › diy projects & ideas › how-tos › outdoor living
How to Build a Fire Pit Ring
Our fire pit kit is comprised of block and a metal ring insert. A kit like the one in this project is easy for a beginner do-it-yourselfer (DIYer) to tackle in a weekend.
Published   March 24, 2023
Discussions

Fire Pit Ring
Does it have to be metal? I built this a few years ago over the course of 2 weekends and couldn’t be happier with it. https://imgur.com/a/yR04TeO More on reddit.com
🌐 r/DIY
4
3
October 7, 2023
Do I need a fire pit ring for a DIY fire pit?
No. I have a paver circle that's 2 papers tall, so around 1' tall. Not only is there no fire ring, but I set it up on the grass and had it burn its own crater into the ground. It's been years and I've had parties and bonfires and even just making snores with the kids. 0 issues More on reddit.com
🌐 r/landscaping
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2
September 15, 2023
Probably posted here a lot but DIY smokeless fire pit
"Man, this guy is going to burn his car to the ground..." ~looks at second picture~ "oh." More on reddit.com
🌐 r/DIY
102
813
June 2, 2024
Fire Pit Ideas
You need to line the internal with firebrick. If those are pavers they will explode from the heat. More on reddit.com
🌐 r/DIY
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27
February 20, 2025
Top answer
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(edit Most barrels...) won't last very long as fire pits. I know this from burning trash when I was a kid. By the time the barrel was full it was falling apart. I never counted, but I would expect it to work well for about 10-20 burns and maybe 50-60 burns before its paper thin and falling apart.

Edit: The thickness of the metal is what matters. 18 gauge drums are what I find to be the industry standard; 18 gauge won't last very long in my opinion. A thicker drum would last longer. I personally own a fire pit object that is very thin, which probably would not last more than 10 burns. So it goes to show that any ol' manufacturer may not necessarily make a decent product.

I have seen barrels converted to wood stoves. I have seen some of them fall apart and I have seen some stand for decades. This is due (primarily) to the thickness of the steel.

Edit2: Product reviews are probably important when you can't get the actual specifications. Amazon has reviews for the example product that you linked... 3.5 stars is not so hot.

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"what (are) the advantages of having one..." "to avoid direct heating of the surrounding rock/concrete"

Yes, the advantage is to reduce direct conductive and radiant heat transfer to the surrounding material. Heating clay bricks, rocks, stones, concrete, decorative bricks/pavers, etc. will cause them to crack and crumble. Sometimes immediately, sometimes over a period of time. Sometimes explosively and dangerously, due to moisture in the stone/clay/concrete (unless you use special refractory brick).

I agree with other comments and posts, a DIY job is fine but thicker steel/iron is the key to good performance. I would say 12 gauge would be minimum thickness.

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Sunnydaze Decor
sunnydazedecor.com › home › bright ideas blog › bright ideas blog
Does Your Fire Pit Need a Liner? 3 Questions to Consider – Sunnydaze Decor
If your fire pit is made of fire bricks, you won't need to use an insert. Fire bricks are made to withstand intense temperatures and are an excellent choice for permanent fire pits.
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Instructables
instructables.com › outside › camping
How to Build Your Own Fire Pit : 6 Steps (with Pictures) - Instructables
April 11, 2022 - As originally built, the fire pit was seven layers tall--each layer took 14 stones--and about 25 inches tall. But we have found that the fires burn even better once we removed one layer of stone. Our detailed video demonstrates the making of this easy DIY project from start to finish.
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Reddit
reddit.com › r/diy › fire pit ring
r/DIY on Reddit: Fire Pit Ring
October 7, 2023 -

Looking for some assistance on proper materials and execution. My family owns property where we have a cabin. We currently have a fire pit, but it doesn’t have a ring or stones around it. It’s just an area in the ground about 3 feet in diameter, some brick/stone (yes, the kind that withstands the heat) to demarcate the area. I was looking to get them a ring about 5-6 feet in diameter, but they’re fairly expensive. Any thoughts on how I can make one, buy the materials and have someone do it, or should I just pay the full price and have it made for me? Thanks!

Photo from Fire Pit Screens to depict what I’m describing.

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BBQGuys
bbqguys.com › home › outdoor living › outdoor heating & accessories › outdoor fire pits › wood burning fire pits
36 Inch Square Steel Wood-Burning Fire Pit Enclosure in by Ultimate Patio : BBQGuys
Use this Ultimate Patio 30-Inch square durable heavy-duty rim to make a stunning DIY fire pit . Surround it with bricks or pavers, use it as a durable fire pit ring above the ground, or even dig down and place this rim inside the ground.
Find elsewhere
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Cordouan-tech
cordouan-tech.com › Ring-2-0mm-Thick-Steel-Liner-For-Above-Or-In-Ground-DIY-Fire-911528
45-Inch Fire Pit Ring - 2.0mm Thick Steel Liner For Above ...
VASCO KIN: Revolutionary time-resolved dynamic light scattering for in-situ particle analysis. High temperature, concentrated samples, flow-based measurements.
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Fix This Build That
fixthisbuildthat.com › home › archive › build your own diy smokeless fire pit
Build your own DIY Smokeless Fire Pit | FixThisBuildThat
March 14, 2025 - Why does this matter? You need to create a chamber between the fire pit stones and the fire pit ring. Adding the right fire pit ring is the best way to do this. The most important step in building a DIY smokeless fire pit is making sure your fire pit insert fits the right way.
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Lowe's
lowes.com › home › diy projects & ideas › how-tos › outdoor living
How to Build a Fire Pit | Lowe's
Liven up your landscape with a custom fire pit. Explore these DIY fire pit ideas and learn how to build a fire pit.
Published   August 29, 2025
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Talbrossealing
talbrossealing.com › 0mm-Thick-In-Ground-Or-Above-Ground-Fire-Pit-Liner-1098743
3.0mm Thick In-Ground Or Above Ground Fire Pit Liner
November 11, 2025 - About us Founded in 1981, Talbros Sealing Materials has evolved into a premier manufacturer of sealing solutions in India. Originally specializing in cork rubber gasketing, we have expanded our product portfolio to include: Cork rubber sealing materials Rubber & rubber-metal molded bonded gaskets ...
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The Spruce
thespruce.com › diy-backyard-fire-pits-4142011
26 DIY Fire Pit Ideas and Plans for Any Style and Budget
March 11, 2025 - To protect and extend the viability of your fire pit, consider using a fire ring as a liner or fire bricks. ... Experiment with how you stack your bricks or rocks around the fire pit.
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The Home Depot
homedepot.com › diy projects & ideas › outdoor living ideas › outdoor decor ideas & projects
How to Build a DIY Fire Pit With a Seating Area - The Home Depot
August 21, 2024 - You’ll also want to plan accordingly with its location based on the edgers you’ll be using. Plan your fire pit location and keep in mind how many edgers you’ll need to get a rounded number of edgers needed. You can complete this DIY project using a fire pit kit or concrete blocks from The Home Depot.
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Sawmill Creek
sawmillcreek.org › forums › forum info and community discussion › off topic forum
Ideas for interior of fire pit wanted | Sawmill Creek Woodworking Community
April 5, 2009 - A piece of pierced metal grate cut to a tight fit raised the fire off the flue liner about an inch and provided a good combustion air source. The open ends made scooping ashes out easy. ... I used fire bricks in ours, with the fire rated mortar. IIRC, they were the 1 1/2" thick bricks so I could make the radius I wanted. Cut with a masonry blade on the skil saw. Took one evening to fit them and install them. Our fire pit is made from CMU block with flagstone veneer on the outside and a flagstone cap.
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BBQGuys
bbqguys.com › home › outdoor living › outdoor heating & accessories › outdoor fire pits › wood burning fire pits
33 Inch Round Steel Wood-Burning Fire Pit Enclosure in by Ultimate Patio : BBQGuys
The Ultimate Patio round fire pit liner features two options so you can make your own fire pit! Place this fire pit rim in the ground, then back fill the dirt around the outside for the perfect in-ground fire pit. Place your wood inside the rim and light your fire, or keep it above ground and surround it with your choice of bricks for a DIY fire pit.
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Walmart
walmart.com › patio & garden
Fire Pit Liner
From $60.99Fire Pit Ring Liner for Outdoor DIY Campfire Wood Burning Fire Pit Ring 3mm Thick Heavy Duty Solid In-Ground Metal Smokeless Firepit Rim Insert for Bonfire Patio Backyard Easy Assembly, Rusty 24"
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A Beautiful Mess
abeautifulmess.com › home › diy project › make your own fire pit in 4 easy steps!
Make Your Own Fire Pit in 4 Easy Steps! - A Beautiful Mess
May 15, 2023 - How to build your own fire pit for your backyard in just four easy steps. it's really not that hard to build a professional-looking fire pit!
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Sunnydaze Decor
sunnydazedecor.com › home › sunnydaze fire pit rings & diy liners
Sunnydaze Fire Pit Rings & DIY Liners
Fire pit insert kits include everything you need to create a base for your own DIY custom fire pit. These can be used as a liner for custom in-ground fire pits or as a fire pit rim for above-ground designs. An in-ground fire pit ring adds the finishing touch to hardscaped fire pits.