How to build a fire pit with retaining wall blocks

Can I use retaining wall blocks for fire pit?

Your fire pit will be just fine with retaining wall blocks, but once you’re done building the pit, you may wish to insert a steel fire ring. Doing so will extend the life of your blocks by preventing them from drying out prematurely.

How many retaining wall blocks do I need to make a fire pit?

I picked up some cheap retaining wall blocks from Home Depot. Pavers also work well, but since these are literally made to be used as a wall, they stack nicely. The fire pit is 36″ in diameter, so its circumference is about 113″. Each block is about 9″ long on the short end, so I needed 13 bricks for each “level”.

How do you make a fire pit out of retaining wall blocks?

Tools used

  1. Step 1: Measure and mark the fire pit area. First, figure out how big you want yours to be. …
  2. Step 2: Lay retaining wall blocks. Lay your first layer of blocks. …
  3. Step 3: Secure the retaining wall blocks. …
  4. Step 4: Fill holes and finish sealing interior. …
  5. Step 5: Install capstones.

Can you use concrete blocks to build a fire pit?

You can build a cinder block fire pit directly on the ground. … You don’t want to use a compressed concrete block that’s too dense in a fire pit. It must be porous enough to vent any steam that forms inside as trapped water turns to steam. If blocks aren’t porous, they could explode as steam builds.

What blocks to use for a fire pit?

For a fire pit ring, you need trapezoidal blocks, which are narrower on one side. This allows the edges to fit snugly together for a circle without creating any gaps. A square fire pit uses rectangular blocks and can be constructed in a variety of patterns with blocks of different shapes and sizes.

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Do you need air holes in a fire pit?

Every fire pit needs air flow to provide oxygen to flames. This becomes more of an issue when you light a fire contained within an aboveground walled pit. Place one 2-inch hole every 24 to 36 inches around the base of the pit. Keep holes cleared of ash and other debris to ensure adequate air flow.

What is the best base for a fire pit?

Hard rocks like granite, marble, or slate are much denser, and therefore less likely to absorb water and explode when exposed to heat. Other rocks that are safe to use around and in your fire pit include fire-rate brick, lava glass, lava rocks, and poured concrete.

What stone is best for fire pit?

Flagstone and crushed stone are ideal materials for the fire pit cap, and the stones in the center of the pit, respectively.

Can you build a fire pit on grass?

One of the first things you should do when considering adding a fire pit to your yard is where you’re going to put it. … Nothing around the fire pit area should be flammable, so don’t locate it near any tall grass. And, make sure the area is level. Don’t build a fire pit on a slope.

Will retaining wall blocks explode?

Selecting Materials for Fire Pit Construction

As we mentioned, concrete blocks can actually explode if they aren’t made to heat up. … Whether you choose a natural stone fire pit or even one made with manufactured materials, a liner will add an element of safety and security.

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Will cinder blocks explode in a fire pit?

Are Cinder Blocks Going To Explode In These Fire Pits? No, generally speaking cinder blocks will not explode when exposed to the kind of heat fire pits put out (river rocks will though, check out our article). However, you might find that pavers or fire bricks are a better option for the long term.

Is there a difference between concrete block and cinder block?

Cinder block is made of concrete and cinder. Concrete block is produced from steel, wood or cement. Cinder block is lighter than concrete blocks. Concrete block is heavier because it contains stone and sand.

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