A Step-by-Step Guide to Building Outdoor Fireplaces

Building an outdoor fireplace can be a fun and rewarding DIY project, but it requires careful planning and execution. Choose a location that's at least 10 feet away from any flammable materials, such as trees or buildings, to ensure safety.

First, you'll need to decide on a design style for your outdoor fireplace. Consider the size and shape of your yard, as well as your personal taste in architecture. A freestanding fireplace can be a great option for small spaces, while a built-in fireplace can be more suitable for larger areas.

Before you begin building, make sure to check local building codes and regulations regarding outdoor fireplaces. Some areas may have specific requirements for materials, size, and placement. It's also a good idea to consult with a professional if you're unsure about any aspect of the process.

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Before you start building your outdoor fireplace, it's essential to cover the essential groundwork. This means understanding local building codes and planning your patio layout, which will make or break your project. In Part 1, we explored these crucial pre-build considerations in detail.

To ensure a successful build, you'll need to choose and set a solid foundation. Depending on your soil and local codes, you can opt for a concrete pier foundation or a compacted gravel base. A stable, well-built foundation is key to a fireplace that stands strong for years.

Here are some key points to consider when planning your outdoor fireplace:

Before you start your outdoor fireplace project, take some time to develop a solid plan of action. This will help you avoid costly mistakes and ensure your project stays on track.

Measure your backyard space to see if you have enough room for the fireplace kit. The Fremont fireplace kits dimensions without add-ons require a 52” W x 48” D x 91” T space.

Consider what type of fuel you want to use - wood or gas logs. This will impact the design and functionality of your fireplace.

Think about any additional features you might want, such as extra chimney clearance or wood storage on the side.

Planning an outdoor fireplace requires considering several key points to ensure a safe and functional installation.

First and foremost, you need to check your local building codes to ensure compliance. This includes understanding regulations around placement, size, and type of fireplace.

Prevailing wind direction is another crucial factor to consider. This will help you determine the best location for your fireplace to prevent smoke from entering your home.

Proximity to trees and structures is also important to avoid fire hazards. A good rule of thumb is to keep your fireplace at least 10 feet away from your home, trees, and any other structures.

The relationship between your fireplace and other activity areas on your site is also worth considering. This might include hot tubs, swimming pools, or dining patios.

Here are some key points to consider when planning your outdoor fireplace:

Your landscape designer will help you note the effect of wind and nearby structures before design begins.

Planning a stable foundation is crucial for a successful outdoor fireplace build. You need to choose between a concrete pier foundation or a compacted gravel base, depending on your soil, local codes, and preferences.

A stable foundation ensures that your fireplace stands strong for years, so don't skip this step. Our how-to video and downloadable specs will walk you through preparing the best foundation for your outdoor fireplace.

To start, dig a trench approximately 12 inches deep and at least 3 feet wider than the planned fireplace dimensions. Fill this with a 6-inch gravel layer, compact it, and add a 4-inch layer of concrete.

Let the concrete cure for at least 48 hours. Ensure the surface is level, as this will ensure stability and longevity of the fireplace. A level surface is key to a successful build.

Here's a quick summary of the foundation types:

To build an outdoor fireplace, you'll need the right tools and materials. Having the right tools on hand will make the job smoother and more efficient, so make sure to gather them first.

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A level and a hammer are essentials that will come in handy throughout the process. You'll also need a bucket of water to apply on mortar, with a minimum of 8 ounces or up to half a gallon.

When selecting materials, choose cinder blocks rated for fire safety and consult with a local building supply store for guidance. You'll also need mortar mix, firebrick, fire-resistant adhesive, grate, and spark screen to secure the blocks and ensure safety.

Here's a list of materials you'll need to consider:

Don't forget to check local regulations and use a proper base poured at the correct depth to prevent frost heave.

First, you'll need to gather all the necessary materials and tools for your project. This includes items like lumber, nails, and a hammer.

Lumber can be made from various types of wood, such as pine or oak, and comes in different thicknesses.

It's essential to choose the right type of lumber for your project, as it will affect the overall quality and durability of the finished product.

For example, pine is a softwood that's often used for framing, while oak is a hardwood that's commonly used for flooring and furniture making.

Nails come in different sizes and types, such as finishing nails or roofing nails, and it's crucial to use the right type for the job.

A hammer is a fundamental tool for any project, and it's essential to have a good quality one that's comfortable to hold and use.

Having the right tools on hand will make your outdoor fireplace build smoother and more efficient. A hammer is a must-have for tapping blocks into place.

You'll also need a level to ensure your structure is perfectly aligned. A trowel is necessary for applying mortar to secure the blocks.

A bucket of water is required to mix with mortar, typically around 8 ounces or up to half a gallon. This helps to achieve the right consistency.

Here's a rundown of the essential tools you'll need:

Laying the foundation of your outdoor fireplace is a crucial step that sets the stage for a safe and enjoyable outdoor space. It's essential to begin from the center of the base to align the fireplace for optimal placement.

The foundation is the backbone of your fireplace, and a stable, well-built foundation ensures it stands strong for years. You can choose between a concrete pier foundation or a compacted gravel base, depending on your soil and local codes.

It's recommended to start each course from the back corners, and use your level as a straight edge to keep your build plumb. Aligning multiple courses avoids twisting, which can lead to structural issues.

Before you begin, it's crucial to establish a solid foundation and consider safety features. A secure foundation prevents structural issues, while correct ventilation and fire safety measures protect against potential hazards.

Here are some key tips to keep in mind as you lay the foundation:

To construct the fireplace, keep your courses straight and square. This will ensure that your blocks end up at the proper length.

You'll be gluing courses of blocks together, so sweep each layer clean after laying it down. Then, apply adhesive on top of the blocks and place the next layer on top. Brush off any loose debris before setting a stone.

A double 1/4″ bead of glue is usually ideal, as it allows the blocks to scrape together when stacked. Don't apply too much glue, as it can make the blocks slide and float.

As you start constructing the fireplace, one of the most important steps is deciding on your firebrick pattern. This will determine the design and aesthetic of your fireplace, so take your time and choose a pattern that suits your style.

You have several options to choose from, including running bond, herringbone, and more. The width of your joints is also important to consider, as it will affect the overall look of your fireplace.

Before installing the firebrick, you'll need to prepare the space. This involves using high-temp mortar to create a strong bond between the bricks and the firebox. Make sure to leave a 1/4″ mortar joint for a clean and professional finish.

Firebricks are not required by code, but they do add durability and extra heat retention to your fireplace. To install them, use firebrick-specific adhesive and follow the instructions to align the bricks, starting from the front and working toward the back. Be sure to leave a slight air gap for proper ventilation.

Once you've completed the firebox, it's time to install firebrick around the angle iron. This will complete the firebox opening and add a finishing touch to your fireplace.

Additional reading: Install Outdoor Flood Lights

Installing the angle iron across your firebox opening is a crucial step in constructing the fireplace. The angle iron serves as a lintel to support the masonry above the firebox opening.

The longer side of the angle iron should point upward and be flush with the surrounding blocks. This ensures a stable and even support.

To add extra support, glue the bottom and sides of the lintel block. This will help prevent any settling or movement of the masonry.

If needed, use shims or mortar to level the angle iron and ensure it is properly aligned with the surrounding blocks.

To build a sturdy outdoor fireplace, you'll want to keep the blocks in straight runs when constructing the kit. This will ensure that your blocks end up at the proper length.

You won't need mortar to build this kit, instead, you'll glue courses of blocks together.

For best results, apply the glue sparingly, a double 1/4" bead is usually ideal. This will prevent the blocks from sliding and floating on a thick pad of adhesive.

It's essential to keep your courses straight, square, level, and plumb. This will prevent any variance in the material from showing on the inside of the kit.

You can only build a wall to one side, so be sure to align the blocks to the outer surface of your kit.

Adding flues to your outdoor fireplace is a straightforward process. You'll need to add the throat to flue adapter, then stack the flues until you reach your desired height.

Make sure to check local codes to determine the maximum height allowed for your fireplace. Three flues are included with the Contractor Fireplace Kit, so you can use those as a starting point.

To ensure proper ventilation, ensure there's an air inlet at the base and a chimney or smoke duct at the top for efficient airflow. This will allow oxygen to feed the fire and channel smoke away from users.

Adding flues is a straightforward process, and you'll want to add them until you reach the desired height for your fireplace. This can be determined by checking local codes, as the height of your fireplace may be restricted.

You'll need to start by adding the throat to flue adapter, then add flues until you reach your desired height. Three flues are included with the Contractor Fireplace Kit, but you may need to purchase more depending on your needs.

Proper ventilation is critical, and it's essential to ensure there's an air inlet at the base and a chimney or smoke duct at the top for efficient airflow. This allows oxygen to feed the fire and channels smoke away from users.

To add flues, simply stack them on top of each other, ensuring everything stays level, square, and plumb. This will ease construction and make the process much safer than working with ladders.

The dimensions for the chimney should be at least 12 inches by 12 inches to promote adequate air draw. This will ensure your fireplace operates safely and efficiently.

You can always extend the height of the chimney up to an extra 48" using our Chimney Extension kits. This will ensure your chimney can clear any obstacles or structures as needed.

Remember to install any other accessories, such as wood storage boxes, to complete your fireplace installation.

Additional reading: How to Build a Chimney Cricket

The Spark Arrestor is an essential component of your outdoor fireplace build. It's designed to prevent floating embers from escaping, providing an extra layer of safety.

Unlike heavier concrete caps, the lightweight stainless steel spark arrestor is easy to install. This makes it a convenient option for DIY enthusiasts.

It's one of the final steps to complete your outdoor fireplace build. Installing the spark arrestor will give you peace of mind knowing your fireplace is safe and secure.

As you near the completion of your outdoor fireplace, it's essential to add a few final touches to ensure it's safe and functional. Make sure to seal any gaps or cracks in the structure to prevent heat from escaping and to protect the surrounding area from sparks and embers.

Use a fireproof mortar to fill in any gaps between the stones or bricks, and apply a coat of high-temperature paint to protect the metal components from rust and corrosion.

A well-built outdoor fireplace can provide warmth and ambiance for years to come, but it's crucial to maintain it regularly to ensure its longevity.

Additional reading: Protect Outdoor Lights

Before you start building your outdoor fireplace, it's essential to verify local codes. This means checking State, Local, or HOA codes and restrictions to ensure compliance.

You'll need to meet clearance requirements from structures and property lines. Sometimes, a simple spark arrestor may be required.

Local codes can be straightforward, but others may have unique or unexpected requirements. Don't be discouraged if you hit a roadblock – creativity in working with your code official can often provide a path forward.

You may need to add a spark arrestor or even have open fires banned in your area. Be sure to check with your local municipality to ensure a compliant build.

It's worth noting that local building codes can affect the placement, size, and even the type of fireplace you can build.

A secure foundation is crucial to prevent structural issues, and you can't start building your outdoor fireplace without one.

You should consider safety features like correct ventilation and fire safety measures to protect against potential hazards.

Make sure to choose a spot for your fireplace at least 10 feet away from your home, trees, and any other structures to prevent fire hazards.

The ground should be level, and you might need to prepare a solid foundation, such as a concrete slab, depending on the weight of the structure.

Laying the foundation involves digging a trench approximately 12 inches deep and at least 3 feet wider than the planned fireplace dimensions.

Fill the trench with a 6-inch gravel layer, compact it, and add a 4-inch layer of concrete, letting it cure for at least 48 hours.

Ensure the surface is level, as this will ensure stability and longevity of the fireplace.

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