Deck Building 101: The Pros and Cons of Using Gravel Under Deck Blocks

Deck building is an exciting project that adds value and beauty to your outdoor living space. However, when it comes to building a deck, there are several factors to consider, including the type of deck blocks you will use. One question that often arises is whether or not you need to use gravel under deck blocks. In this article, we will explore the pros and cons of using gravel under deck blocks to help you make an informed decision for your deck building project. Whether you’re a seasoned builder or a beginner, this article will provide you with valuable insights to ensure your deck is built to last.

Understanding Deck Blocks

What are deck blocks?

Deck blocks are an essential component of building a deck. They are typically made of wood and are used to support the deck’s joists, which in turn support the deck’s surface. Deck blocks are placed under the deck’s perimeter to provide a solid foundation for the deck, and they also help prevent the deck from sinking or settling unevenly into the ground. In addition, deck blocks help distribute the weight of the deck evenly, reducing the risk of the deck collapsing or becoming unstable. Overall, deck blocks play a critical role in ensuring the structural integrity and stability of a deck.

How do deck blocks support a deck?

Deck blocks, also known as post blocks or deck piers, are structural components used to support a deck. They are typically made of concrete or masonry and are placed under the deck’s posts to provide additional stability and prevent the deck from settling or sinking into the ground.

Deck blocks work by distributing the weight of the deck and its occupants across a larger area, which helps to distribute the load more evenly and prevent the deck from deflecting or warping. They also help to stabilize the deck by providing a solid foundation that resists movement and shifting.

Deck blocks are typically installed at a minimum depth of 4 feet below the surface of the ground to ensure that they are stable and can support the weight of the deck. They should also be installed at a minimum distance of 8 feet on center, which means that the distance between the centers of two adjacent deck blocks should be at least 8 feet.

In addition to providing support and stability for the deck, deck blocks also help to prevent moisture from wicking up into the deck’s posts and causing rot or decay. By separating the deck from the ground, deck blocks also help to prevent the deck from coming into contact with moisture-laden soil, which can cause the deck to deteriorate over time.

Overall, deck blocks are an essential component of any deck construction project, as they provide the necessary support and stability to ensure that the deck is safe and durable.

Types of deck blocks

When it comes to deck building, there are several types of deck blocks that you can use. Each type has its own unique characteristics and benefits, so it’s important to understand the differences before making a decision.

Here are some of the most common types of deck blocks:

1. Concrete deck blocks: These blocks are made of concrete and are incredibly durable. They are also very heavy, which makes them ideal for use in larger decks or decks that will be holding a lot of weight.
2. Composite deck blocks: These blocks are made from a combination of materials, including wood fiber and plastic. They are more expensive than concrete blocks, but they are also more resistant to rot and decay.
3. Plastic deck blocks: These blocks are made from plastic and are lightweight and easy to install. They are also more affordable than concrete or composite blocks, but they may not be as durable in the long run.
4. Wood deck blocks: These blocks are made from wood and are a more natural option. They are also relatively affordable, but they may not be as strong as other types of blocks and may not be suitable for decks that will be holding a lot of weight.

Each type of deck block has its own unique advantages and disadvantages, so it’s important to choose the right one for your specific needs. By understanding the different types of deck blocks, you can make an informed decision that will help ensure the success of your deck building project.

Choosing the right deck blocks

When it comes to building a deck, choosing the right deck blocks is crucial to ensure the stability and longevity of your deck. Deck blocks, also known as post blocks or footings, are used to anchor the posts of your deck to the ground, providing support and preventing movement. There are various types of deck blocks available, each with its own set of advantages and disadvantages.

One important factor to consider when choosing deck blocks is their material. Common materials include concrete, composite, and steel. Concrete blocks are the most traditional choice and are often the most cost-effective. However, they can be heavy and may require additional labor for installation. Composite blocks, on the other hand, are lighter and easier to install, but they can be more expensive. Steel blocks are durable and easy to install, but they can rust over time and may not be suitable for all types of soil.

Another important consideration is the size of the deck blocks. The size of the block will depend on the size of the deck and the type of soil it is built on. In general, larger blocks are more stable and can support more weight, but they may also be more expensive and harder to install. Smaller blocks are easier to install and may be more suitable for lighter decks, but they may not provide as much stability.

When choosing deck blocks, it is also important to consider the type of soil the deck will be built on. Different types of soil require different types of blocks to ensure proper support. For example, if the deck will be built on soft or wet soil, blocks with wider footprints may be necessary to prevent sinking. If the deck will be built on rocky or uneven soil, blocks with longer footprints may be needed to provide stability.

Finally, it is important to consider the look of the deck blocks. While function is the primary concern, the appearance of the deck blocks can also affect the overall aesthetic of the deck. Some blocks are designed to blend in with the surrounding landscape, while others are more noticeable. Choosing blocks that complement the style of the deck and the surrounding area can help create a cohesive and attractive design.

In summary, choosing the right deck blocks is crucial to ensuring the stability and longevity of your deck. Consider the material, size, type of soil, and appearance when making your decision. With the right blocks, your deck can provide years of enjoyment and be a beautiful addition to your outdoor living space.

Gravel vs Deck Blocks

The benefits of using gravel

Gravel has become a popular choice for use under deck blocks due to its numerous benefits. Here are some of the advantages of using gravel under deck blocks:

• Easier to install: Gravel is easier to install compared to deck blocks as it requires no additional hardware or tools. Simply pour the gravel into the space under the deck and you’re done.
• Affordable: Gravel is an affordable option compared to deck blocks, which can be quite expensive. It is also a cost-effective solution in the long run as it requires less maintenance compared to deck blocks.
• Drainage: Gravel is an excellent material for drainage. It allows water to flow through it easily, preventing water buildup and damage to the deck.
• Customizable: Gravel comes in a variety of colors and sizes, allowing you to choose the perfect shade and size to match your deck and personal preferences.
• Insulation: Gravel acts as a natural insulation material, protecting the deck from extreme temperatures. This is especially useful in colder climates where the deck may be exposed to snow and ice.
• Aesthetic appeal: Gravel adds an aesthetic appeal to the deck, enhancing its overall appearance. It can also be used to create a natural, rustic look that complements the deck’s surroundings.

Overall, gravel offers a cost-effective, easy-to-install, and versatile solution for use under deck blocks. Its benefits make it a popular choice among deck builders and homeowners alike.

The benefits of using deck blocks

Using deck blocks in the construction of a deck can offer several advantages. Firstly, deck blocks provide a stable and level surface for the deck to rest on, ensuring that the deck is level and does not sag or warp over time. This is particularly important when building a deck on uneven ground or on a slope, as deck blocks can help to distribute the weight of the deck evenly and prevent it from shifting or settling unevenly.

Additionally, deck blocks can be used to adjust the height of the deck, allowing the deck to be built at the desired height off the ground. This can be particularly useful in areas where the ground is uneven or where the deck needs to be built at a specific height to match the surrounding terrain.

Another benefit of using deck blocks is that they can be easily removed or replaced if necessary. This is particularly useful if the deck needs to be moved or if repairs are needed in the future. Deck blocks can also be used to create a drainage system for the deck, ensuring that water is properly directed away from the deck and preventing damage to the deck materials.

Finally, deck blocks can be used to create a finished look for the deck, covering up any uneven or imperfect surfaces and creating a clean, professional appearance. This can be particularly important for decks that are visible from the street or that are used for entertaining or other social gatherings.

Overall, the use of deck blocks in deck construction can provide several benefits, including stability, leveling, adjustable height, ease of repair or replacement, and a finished look. These benefits can help to ensure that the deck is built to last and can provide a safe and functional outdoor living space for years to come.

Comparing the costs

When it comes to choosing between using gravel or deck blocks as a base for your deck, it’s important to consider the costs involved. Both options have their own price points, and understanding these costs can help you make an informed decision.

Material costs

The cost of materials is an important factor to consider when comparing gravel and deck blocks. Deck blocks are typically made of concrete or plastic, while gravel is a natural material that can be obtained from a variety of sources. The cost of deck blocks will depend on the size and quantity needed, while the cost of gravel will depend on the amount needed and the distance it needs to be transported.

Labor costs

In addition to material costs, labor costs are also an important factor to consider. Installing deck blocks requires more labor than installing gravel, as deck blocks need to be laid in a specific pattern and leveled. Gravel, on the other hand, can be spread more easily and quickly, which can save on labor costs.

Long-term costs

When comparing the costs of using gravel versus deck blocks, it’s important to consider long-term costs as well. Deck blocks can last longer than gravel, but they also require more maintenance over time. Gravel, on the other hand, may need to be replaced more frequently, but it is generally easier and less expensive to replace than deck blocks.

In conclusion, when comparing the costs of using gravel versus deck blocks, it’s important to consider all of the factors involved, including material costs, labor costs, and long-term costs. While deck blocks may be more expensive upfront, they may ultimately save money in the long run due to their longer lifespan and lower maintenance needs.

Making the right choice

When it comes to choosing between gravel and deck blocks for under a deck, there are several factors to consider. Both options have their own advantages and disadvantages, and the right choice will depend on your specific needs and preferences.

In this section, we will take a closer look at the pros and cons of using gravel and deck blocks under a deck, and help you make an informed decision about which option is best for your project.

• Gravel
  • Pros:
    • Gravel is a cost-effective option that can provide a level surface for walking and reduce the amount of maintenance required.
    • It can also be used to add drainage and prevent water from pooling under the deck.
  • Cons:
    • Gravel can be slippery when wet, which can be a safety hazard.
    • It can also be difficult to install and may require more effort to keep in place.
• Deck Blocks
  – Deck blocks provide a solid and stable surface for walking, which can improve safety and reduce the risk of injury.
  – They can also be used to raise the deck off the ground, which can help prevent water damage and rot.
  – Deck blocks can be more expensive than gravel, and may require more maintenance over time.
  – They can also be difficult to install and may require professional assistance.

By carefully considering the pros and cons of each option, you can make an informed decision about which is best for your project. Whether you choose gravel or deck blocks, the right choice will depend on your specific needs and preferences, as well as the overall goals of your deck building project.

Installing Deck Blocks

Preparing the ground

Before installing deck blocks, it is essential to prepare the ground where the deck will be built. This step is crucial because it ensures that the deck is level and stable. Here are some steps to follow when preparing the ground for deck blocks:

1. Clear the area: The first step is to clear the area where the deck will be built. This involves removing any debris, such as leaves, branches, and rocks, that may be present. It is also essential to remove any vegetation, such as grass or weeds, that may be growing in the area.
2. Level the ground: Once the area is clear, it is essential to level the ground. This can be done using a shovel or a levelling tool. The ground should be level to ensure that the deck is stable and does not shift over time.
3. Compact the soil: After levelling the ground, it is essential to compact the soil. This can be done using a hand tamper or a mechanical compactor. Compacting the soil ensures that the deck blocks are firmly embedded in the ground and do not shift over time.
4. Mark the location: Once the ground is level and compacted, it is essential to mark the location of each deck block. This can be done using a measuring tape and pencil. It is important to be precise when marking the location of each deck block to ensure that they are installed correctly.

Overall, preparing the ground for deck blocks is a critical step in ensuring that the deck is level and stable. By following these steps, you can ensure that your deck blocks are installed correctly and will last for many years to come.

Measuring and marking

When it comes to installing deck blocks, accurate measurement and marking are crucial to ensure a proper fit and level surface. Here are the steps to follow:

1. Measure the distance between the deck and the finished grade: Use a tape measure to determine the distance between the top surface of the deck and the finished grade. This measurement will vary depending on the height of the deck and the slope of the ground.
2. Mark the location of the deck blocks: Once you have the measurement, mark the location of each deck block using a sharp pencil or marker. Make sure to mark the location of each block at a 45-degree angle, perpendicular to the deck and the finished grade.
3. Check for level: Before you start drilling any holes, make sure the deck is level by using a spirit level or a laser level. If the deck is not level, you may need to adjust the location of the deck blocks or add shims to level the deck.
4. Double-check the measurements: Before drilling any holes, double-check the measurements to ensure that the deck blocks will fit properly and be level.

By following these steps, you can ensure that your deck blocks are installed properly and provide a stable and level surface for your deck.

Placing the deck blocks

When it comes to installing deck blocks, the placement is crucial to ensure that the deck is stable and can support the weight of the decking material. Here are some key points to consider when placing deck blocks:

• Location: Deck blocks should be placed at regular intervals along the perimeter of the deck, typically every 24 to 36 inches. The spacing depends on the size of the deck and the load it will bear.
• Leveling: Make sure the deck blocks are level before placing them. Use a spirit level or a laser level to check the alignment. If the ground is uneven, use concrete footings or adjustable deck blocks to level the surface.
• Compatibility: Ensure that the deck blocks are compatible with the size and type of the decking material you are using. The deck blocks should be able to support the weight of the decking and distribute the load evenly.
• Drainage: Consider the drainage requirements of the deck when placing the deck blocks. If the deck is in an area prone to flooding or heavy rain, ensure that the deck blocks are elevated above the ground to prevent water damage.
• Framing: Make sure that the deck blocks are properly framed in to provide adequate support for the decking material. Use 2×6 or 2×8 lumber for the framing, and make sure that the framing is square and level.
• Fastening: Use galvanized or stainless steel deck screws to fasten the deck blocks to the framing. This will ensure that the deck blocks are securely attached to the deck and can support the weight of the decking material.

By following these guidelines, you can ensure that your deck blocks are properly placed and can provide the necessary support for your decking material.

Finishing the installation

Ensuring a Secure Fit

When installing deck blocks, it is crucial to ensure that they fit securely in the holes drilled into the deck framing. This can be achieved by using a level to check that the blocks are plumb and tightening the bolts evenly to prevent movement. It is also recommended to use washers under the bolts to distribute the pressure evenly and prevent the wood from splitting.

Applying Finishing Touches

Once the deck blocks are installed and secured, the finishing touches can be applied. This may include filling any gaps between the blocks and the deck framing with concrete or using a concrete sealer to protect the wood from moisture. Additionally, gravel can be spread over the area between the deck blocks to provide a level surface and prevent weed growth. It is important to ensure that the gravel is spread evenly and is not too deep, as this can cause drainage issues.

Maintenance and Safety

Keeping your deck in good condition

Regular maintenance is crucial to ensure the longevity and safety of your deck. One aspect of maintenance is keeping the deck blocks in good condition. Deck blocks are the supports that hold up the deck and prevent it from sagging. If the deck blocks are not maintained properly, the deck can become uneven and dangerous.

There are several ways to maintain deck blocks, but one effective method is to use gravel underneath them. This method has its pros and cons, which will be discussed in detail below.

Pros of Using Gravel Under Deck Blocks

• Drainage: Gravel helps to divert water away from the deck blocks, preventing water damage and ensuring that the deck remains dry.
• Stability: Gravel provides extra support to the deck blocks, preventing them from shifting or sinking into the ground.
• Reduced Rot: Gravel helps to keep the deck blocks dry, reducing the risk of rot and decay.

Cons of Using Gravel Under Deck Blocks

• Weight: Gravel can add weight to the deck, which may require additional support or reinforcement.
• Accessibility: Gravel can make it difficult to access the deck blocks for maintenance or repair, which may require additional work.
• Aesthetics: Gravel may not be visually appealing for some homeowners, who may prefer a more streamlined and modern look for their deck.

In conclusion, using gravel under deck blocks has its advantages and disadvantages. While it can provide additional support and stability, it may also add weight and make maintenance more difficult. Homeowners should carefully consider these factors before deciding whether to use gravel under their deck blocks.

Safety considerations

When it comes to safety, there are several factors to consider when deciding whether or not to use gravel under deck blocks. One of the most important safety considerations is slip resistance. Gravel can provide excellent slip resistance, which can help prevent slips and falls on your deck. However, if the gravel is not properly distributed or becomes loose over time, it can become a tripping hazard.

Another safety consideration is drainage. Proper drainage is essential to prevent water from accumulating on your deck and causing damage. Gravel can help improve drainage by allowing water to flow through it and away from your deck. However, if the gravel is not properly installed or becomes clogged with debris, it can cause water to build up and damage your deck.

Additionally, it’s important to consider the weight of the gravel. While gravel is a lightweight material, it can still add significant weight to your deck. This can cause your deck to sag or become unstable over time, which can compromise its structural integrity and safety.

In conclusion, when considering the use of gravel under deck blocks, it’s important to weigh the safety benefits against the potential risks. While gravel can provide excellent slip resistance and improve drainage, it’s important to ensure that it’s properly installed and maintained to prevent it from becoming a tripping hazard or causing damage to your deck.

Deck inspections

Regular deck inspections are crucial to ensure the structural integrity and safety of your deck. A well-maintained deck not only looks better but also lasts longer. Here are some key points to consider when inspecting your deck:

• Check for damage: Look for any signs of damage, such as cracked or warped boards, loose nails, or damaged railings. These issues can compromise the safety of your deck and should be addressed promptly.
• Inspect the deck structure: Check the posts, beams, and joists for any signs of rot, decay, or damage. These are essential components of your deck’s structure and need to be in good condition to support the weight of your deck and any furniture or accessories you may have.
• Inspect the deck drainage: Ensure that the deck is sloped correctly to allow water to drain off and not pool up. Check the gutters and downspouts to make sure they are functioning properly.
• Inspect the deck surface: Check the deck surface for any signs of wear and tear, such as fading, discoloration, or splintering. If necessary, sand and stain or paint the deck to refresh its appearance and protect it from further damage.
• Inspect the deck footings: Check the footings to ensure they are properly secured to the ground and can support the weight of your deck.

By following these guidelines, you can ensure that your deck is safe and well-maintained, providing you with many years of enjoyment.

Frequently Asked Questions

What are the minimum requirements for deck construction?

When it comes to deck construction, there are several factors to consider, including the materials you’ll use, the size of the deck, and the local building codes that must be followed. The following are some of the minimum requirements for deck construction that you should be aware of:

• Footings: Decks must be built on a solid foundation, and the footings must be anchored to the ground to ensure stability. Typically, the footings are made of concrete and are placed below the frost line to prevent movement due to freezing and thawing.
• Size: The minimum size of a deck will depend on the local building code, but in general, it should be at least 24 inches wide and 36 inches deep. This size will accommodate most patio furniture and provide enough space for people to move around comfortably.
• Height: The maximum height of a deck will also depend on the local building code, but in general, it should not exceed 8 feet. This height will ensure that the deck is safe and stable, and that it can support the weight of people and furniture.
• Handrails: Decks that are more than 30 inches above the ground must have handrails on at least two sides. The handrails must be at least 34 inches high and provide a secure grip to prevent falls.
• Guardrails: Decks that are more than 6 feet above the ground must have guardrails in addition to handrails. The guardrails must be at least 42 inches high and be capable of withstanding a force of 200 pounds applied horizontally at any point along the rail.
• Slip-resistant surface: The surface of the deck must be slip-resistant to prevent accidents. This can be achieved by using non-slip decking materials or by adding a slip-resistant finish to the surface.

These are just some of the minimum requirements for deck construction, and you should consult your local building code for specific requirements in your area. It’s also important to note that these requirements may vary depending on the size and complexity of the deck you’re building.

How do I know if my deck is safe?

Deck safety is a critical concern for homeowners, as a poorly constructed deck can pose significant risks to people and property. Here are some ways to assess the safety of your deck:

1. Check for Structural Damage: Look for signs of damage, such as cracked or splintered wood, loose or broken railings, and uneven decking.
2. Inspect the Footings: Make sure the deck’s footings are properly installed and secured to the ground.
3. Ensure Proper Drainage: Check that water is not pooling on the deck and that there is proper drainage to prevent water damage.
4. Examine the Fasteners: Ensure that all fasteners, such as screws and nails, are properly tightened and not loose.
5. Look for Signs of Rot: Check for signs of rot or decay, such as mold or mildew, which can weaken the deck’s structure.

If you notice any of these issues, it’s important to address them promptly to ensure the safety of your deck.

Can I use alternative materials for deck blocks?

When it comes to deck building, there are many factors to consider, including the type of deck blocks used. Gravel is a popular choice for deck blocks, but it’s not the only option. If you’re wondering whether you can use alternative materials for deck blocks, the answer is yes.

What are some alternative materials for deck blocks?

There are several alternative materials that can be used for deck blocks, including concrete, stone, and plastic. Each of these materials has its own set of pros and cons, which will be discussed in more detail below.

What are the pros of using concrete deck blocks?

One of the main advantages of using concrete deck blocks is their durability. Concrete is a strong and long-lasting material that can withstand the weight of a deck and resist damage from the elements. Additionally, concrete deck blocks are easy to install and can be customized to fit the specific needs of your deck.

What are the cons of using concrete deck blocks?

One potential downside of using concrete deck blocks is their weight. They can be heavy and difficult to move once they’ve been installed, which can make it challenging to make any changes to your deck in the future. Additionally, concrete can crack over time, which can compromise the structural integrity of your deck.

What are the pros of using stone deck blocks?

Stone deck blocks are another popular alternative to gravel. They are natural and aesthetically pleasing, and can complement the look of a traditional wooden deck. Stone deck blocks are also relatively lightweight, which makes them easy to install and move if necessary.

What are the cons of using stone deck blocks?

One potential downside of using stone deck blocks is their cost. They can be more expensive than other materials, and may require more maintenance over time. Additionally, stone deck blocks may not be as strong as concrete or other materials, which could impact the overall stability of your deck.

What are the pros of using plastic deck blocks?

Plastic deck blocks are a newer option for deck building, and they offer a number of advantages. They are lightweight and easy to install, and can be customized to fit the specific needs of your deck. Additionally, plastic deck blocks are resistant to rot and decay, which makes them a good choice for decks that are exposed to the elements.

What are the cons of using plastic deck blocks?

One potential downside of using plastic deck blocks is their durability. While they are resistant to rot and decay, they may not be as strong as other materials, which could impact the overall stability of your deck. Additionally, plastic deck blocks may not be as aesthetically pleasing as other materials, which could impact the overall look of your deck.

What are the building codes for deck construction in my area?

When it comes to deck construction, building codes vary depending on the location and type of deck being built. It is important to be aware of these codes to ensure that your deck is safe and meets all necessary requirements. Here are some frequently asked questions about building codes for deck construction:

What are the building codes for deck construction in my area?

The building codes for deck construction can vary depending on the location and type of deck being built. It is important to check with your local building department to find out what codes apply to your specific situation. Some common building codes for deck construction include:

• Footing requirements: Decks must be built on footings that are able to support the weight of the deck and any loads that may be placed on it. The size and depth of the footings will depend on the size and type of deck being built, as well as the soil conditions at the site.
• Load-bearing requirements: Decks must be able to support the weight of the deck itself, as well as any loads that may be placed on it, such as furniture or people. The load-bearing requirements will depend on the size and type of deck being built, as well as the soil conditions at the site.
• Railing requirements: Decks must have railings that meet certain height and strength requirements. The height of the railings will depend on the height of the deck, and the strength of the railings will depend on the size and type of deck being built.
• Building material requirements: Decks must be built using materials that meet certain strength and durability requirements. For example, wood decks must be made from treated lumber that is able to withstand the elements and resist rot and decay.

It is important to note that these are just a few examples of the building codes that may apply to deck construction in your area. It is always best to check with your local building department to find out what specific codes and requirements apply to your situation.

FAQs

1. What are deck blocks?

Deck blocks are vertical posts that are used to support a deck structure. They are typically made of wood or concrete and are used to provide support for the deck floor and rails.

2. What is the purpose of gravel under deck blocks?

Gravel is often used under deck blocks to provide additional support and stability for the deck. It can also help to prevent the deck from sinking or settling into the ground over time.

3. Is gravel necessary for deck blocks?

No, gravel is not necessary for deck blocks. However, it can be beneficial in certain situations, such as when building a deck on uneven or unstable ground.

4. What type of gravel should I use under deck blocks?

Any type of gravel can be used under deck blocks, but it is important to use a fine gravel or sand to prevent the deck from sinking or settling. Crushed stone or other coarse materials can also be used, but they may not provide as much support.

5. How much gravel should I use under deck blocks?

The amount of gravel used under deck blocks will depend on the size and weight of the deck, as well as the type of gravel being used. A general rule of thumb is to use at least 4 inches of gravel under each deck block.

6. Can I use other materials instead of gravel under deck blocks?

Yes, other materials can be used instead of gravel under deck blocks, such as crushed stone, sand, or even soil. However, it is important to use a stable and supportive material to ensure the deck remains level and stable over time.

7. How do I properly install deck blocks with gravel?

To properly install deck blocks with gravel, start by digging holes that are at least 12 inches deep and 12 inches wide for each block. Fill the holes with gravel, making sure to pack it down tightly. Then, insert the deck blocks into the holes and fill the remaining space with more gravel. Make sure the deck blocks are level and plumb before proceeding with the rest of the deck construction.

Deck blocks and beams