Using Concrete Deck Blocks Instead of Footings: Can You?

When building a structure like a deck or patio, one of the key considerations is the foundation. Conventional wisdom often points towards pouring concrete footings, but many homeowners and DIY enthusiasts wonder, "Can I use concrete deck blocks instead?" The short answer is yes, you can. However, understanding when and how to use them is crucial.

The primary purpose of a footing is to distribute the structure's weight evenly across a larger surface area, preventing settling or sinking. Concrete deck blocks, also known as adjustable deck blocks or paving slabs, can indeed serve this purpose. They come in various sizes, are typically made of recycled concrete orelse made of recycled materials which make them eco-friendly, and can be adjusted to create a level surface for your structure.

Advantages of Using Concrete Deck Blocks

Concrete deck blocks offer several advantages over traditional concrete footings:

Cost-effectiveness: Deck blocks are generally less expensive and more accessible than professional concrete pouring. They also require less preparation work, saving you time and money.

Ease of Installation: Concrete deck blocks are lighter and easier to handle than bags of concrete. They can be installed by one person and adjusted easily until you achieve a level surface.

Time-Saving Installation

One of the biggest benefits of using concrete deck blocks is the time saved in the installation process. Here's how:

1. **No Curing Time:** Unlike concrete, deck blocks don't need time to cure before you can proceed with building your deck. This means you can start constructing your structure right away.

2. **Quick Adjustment:** Deck blocks can be easily shifted around until you achieve a perfectly level surface. This eliminates the need for time-consuming remedy work after your footings have cured.

Structural Integrity and Durability

While concrete deck blocks may seem less robust than poured concrete, they provide adequate support for most decks and light structures. Here's why:

1. **Load Distribution:** Deck blocks are designed to spread the weight of your structure evenly, mimicking the function of traditional footings. They are typically engineered to bear loads of several tons.

2. **Long-Lasting:** Made from weather-resistant materials, concrete deck blocks can withstand harsh conditions and last for many years, providing a stable foundation for your structure.

Disadvantages and Considerations

As with any building material, there are some drawbacks to using concrete deck blocks:

Limited Adjustment After Installation: While deck blocks can be adjusted before you start building, any shifts after construction begins can compromise the integrity of your structure.

Potential Uneven Settling:** Unlike poured concrete, which settles evenly, deck blocks may shift independently over time. This can lead to an uneven surface and potential structural issues.

When Not to Use Deck Blocks

Deck blocks may not be the best choice in the following situations:

1. **Heavy Structures:** If your deck or structure is particularly heavy, such as those made from heavy wood or accommodating heavy equipment, traditional concrete footings may be a more suitable option for adequate support.

2. **Unstable Soil:** In areas with soft, loose, or expansive soil, the use of deck blocks may lead to instability. Pouring concrete footings or using other supports may be necessary to ensure a stable foundation.

Tips for Using Concrete Deck Blocks

To ensure the success of your project, follow these tips:

1. **Prepare the Site:** Ensure the ground is level and compacted before installing deck blocks. This will help prevent shifting and settling.

2. **Use Leveling Tools:** Make use of leveling tools like a string level or a digital level to ensure your blocks are perfectly level before proceeding with construction.

3. **Allow for Drainage:** Ensure water can drain away from your deck blocks to prevent potential damage from freezing and thawing.

In a nutshell, concrete deck blocks can indeed be used as a cost-effective and time-saving alternative to traditional concrete footings. However, proper evaluation of your specific situation, including the structure's weight, soil conditions, and local building codes, is crucial to ensure a successful and safe outcome. Always consult with a professional if you're unsure about any aspect of your project.