DYI Cinder Block Pit: Build Your Own Fire Pit in 5 Steps

Transform your outdoor space into a cozy retreat by creating a DIY cinder block pit. This versatile structure serves as both a fire pit and a seating area, perfect for gatherings with friends and family or a quiet evening under the stars. With this step-by-step guide, you'll learn how to build your own cinder block pit, enhancing your backyard while adding value to your home. Let's dive in!

Before starting your project, you'll need to gather the necessary materials and tools. You'll find most of these items at your local hardware store. To keep costs low, consider using recycled or reclaimed cinder blocks. Remember, safety first: always wear appropriate clothing, gloves, and safety glasses when handling heavy materials and using power tools.

Design Considerations and Site Preparation

Planning is crucial for a successful DIY project. Choose a location for your cinder block pit that's level, away from flammable structures, and at least 25 feet from your home or other dwellings to ensure safety. Sketch out your design, determining the size and shape that best suits your space.

The most common shape is round, but you can also create square, rectangle, or even irregularly shaped pits. Aim for a height and diameter that allows for comfortable seating and easy access to the fire pit. Once you've finalized your design, mark out the area using spray paint or stakes and string.

Materials Needed

To build your DIY cinder block pit, you'll need the following materials:

• Cinder blocks (new or recycled)
• Concrete or fire-resistant mortar
• Mason's line and trowel
• Level
• Tape measure
• Shovel
• Wheelbarrow (optional)
• Gravel or landscape fabric
• Fire pit grate and cooking grate (optional)

Tools Required

In addition to the materials listed above, you'll need the following tools:

• Heavy-duty gloves
• Safety glasses
• Handheld concrete cutter or angle grinder with masonry blade
• Brick hammer
• Tamping tool
• Rubber mallet
• Power drill (for mixing mortar, optional)

Building the Cinder Block Base

Begin by laying out a layer of gravel or landscape fabric at the marked location to protect your cinder block pit from moisture and prevent the base from settling. Use a tamping tool to create a stable, level surface.

Start laying out your cinder blocks in the desired pattern, using a level to ensure each block is properly aligned. For a round pit, alternate placing blocks on their sides and ends to create a stable, interlocking pattern. For square or rectangular shapes, lay blocks flat, leaving a small gap between each.

Laying the First Course

Apply a thin layer of mortar to the gravel or landscape fabric using your mason's trowel. Begin laying your first course of cinder blocks, routinely checking and adjusting their position to ensure they're level and aligned according to your design. Leave a small gap between each block to allow for drainage and thermal expansion.

Before continuing, let the mortar set for at least 24 hours to ensure a strong bond between the blocks and the base. After the mortar has cured, you can proceed to the next course.

Building the Walls

Repeat the process of applying mortar and laying cinder blocks, one course at a time, up to the desired height. Maintain your chosen pattern, and ensure each course is level and properly aligned. Use a rubber mallet to gently tap down the blocks, ensuring a snug fit and even joint placement.

Every 3-4 courses, use a brick hammer or handheld concrete cutter to carefully cut blocks to fit any irregularly shaped parts. Always wear safety glasses during this step to protect your eyes from debris.

Installing the Fire Pit Grate

Once you've reached your desired height, allow the mortar to cure for at least 48 hours before proceeding. This ensures the blocks are securely bonded and can safely support the weight of the fire pit grate.

Position the fire pit grate, ensuring it's level and centered within the pit. If you're using a cooking grate, place it on top of the fire pit grate. Now you're ready to light your first fire and enjoy your DIY cinder block pit!

Regularly clean and maintain your fire pit to ensure it remains safe and functional. Remove any debris, and consider applying a waterproof sealant or stonenotice to protect the cinder blocks from moisture and weathering. Invite friends and family over for a memorable gathering around your custom-built fire pit!