How to Use Concrete Deck Blocks for Posts

Concrete deck blocks are versatile, durable, and an excellent choice for creating a sturdy foundation for your posts. Whether you’re building a fence, a deck, or a pergola, understanding how to use concrete deck blocks for posts is crucial for a successful and long-lasting structure. Let’s delve into the process, step by step.

Before we begin, it’s essential to note that while concrete deck blocks are robust, they are not load-bearing. They are designed to support the weight of the post and distribute it evenly across the ground. For significant loads, you may need to consider additional support or a different foundation type.

Preparation and Planning

Before you start, ensure you have all the necessary tools and materials. You’ll need concrete deck blocks, posts, gravel, a shovel, a tape measure, a level, concrete mix, and water. It’s also a good idea to have a friend to help with the heavy lifting.

Plan your post placement carefully. Ensure they are evenly spaced and follow the design of your structure. Mark the locations with stakes or spray paint to guide you during installation.

Site Preparation

Start by clearing the area of any debris or vegetation. Then, dig a small hole at each post location, about 6-8 inches deep and slightly wider than the base of your post. This will accommodate the concrete deck block and provide a stable base for your post.

Fill the bottom of each hole with a layer of gravel, about 2-3 inches deep. This will help with drainage and prevent water from pooling around your post, which could lead to rot or instability.

Installing the Concrete Deck Block

Place a concrete deck block into each hole. Ensure it’s level and centered. You may need to adjust the depth of the hole or add more gravel to achieve this. The top of the block should be level with the ground.

Once the block is in place, you can begin setting your post. Ensure it’s plumb (vertical) using a level. You may need to adjust the block or the post to achieve this. Once the post is plumb, temporarily secure it with a nail or a screw driven into the side of the post and into the block.

Securing the Post

Now that your post is in place, it’s time to secure it to the concrete deck block. This will ensure it stays in place and doesn’t shift over time.

Mix your concrete according to the manufacturer’s instructions. You’ll need enough to fill the void between the post and the block, and to create a small mound around the base of the post.

Filling with Concrete

Using a trowel or a small shovel, fill the void between the post and the block with concrete. Ensure it’s packed tightly to provide maximum support. You may need to use a vibrating tool to remove any air pockets.

Once the void is filled, create a small mound of concrete around the base of the post. This will provide additional support and help to distribute the weight of the post evenly. Ensure the post remains plumb as you work.

Finishing and Curing

Use a trowel to smooth the concrete and create a neat finish. You can also use a float to create a textured finish if desired. Allow the concrete to cure for at least 72 hours before putting any weight on the post.

After the concrete has cured, you can remove the temporary nail or screw used to secure the post. Your post is now ready to support your structure.

Congratulations, you’ve successfully used concrete deck blocks for posts! With proper planning and installation, your structure will be sturdy and long-lasting. Don’t forget to regularly inspect your posts and make any necessary repairs to ensure the longevity of your structure. Happy building!