Can I Use 2x4 as Support Board for a Floating Deck Using Concrete Deck Blocks?

Building a floating deck with concrete deck blocks offers several unique advantages, such as ease of installation and customizable designs. One question commonly asked by DIY enthusiasts and homeowners is whether 2x4 boards can be used as support beams for these structures. While it is technically possible, it requires careful consideration and proper planning to ensure safety and longevity. In this article, we will explore the key factors to consider when using 2x4 boards as support beams for floating decks constructed with concrete deck blocks.

Load Capacity

2x4 boards are lightweight and may not provide adequate support for larger decks or heavier loads. If the deck will be used for furniture or gatherings, it is recommended to use 2x6 or larger boards for added strength. Smaller 2x4 boards are primarily suitable for smaller, lightweight structures or situations where the load is less demanding.

Spacing and Orientation

Proper spacing and orientation of the support beams are crucial for a secure and stable structure. The concrete deck blocks should be placed no more than 4 feet apart, depending on the design and load requirements. To ensure better load distribution, install the 2x4s flat with the 4-inch side down. This orientation provides more stability compared to placing the 2x4s on their edges.

Decking Material Local Building Codes

The type of decking material used on top of the 2x4s will impact the overall strength and durability of the deck. Common decking materials include pressure-treated lumber, composite decking, and timber. Additionally, always check local building codes and regulations regarding floating decks, as they may have specific requirements for materials and construction methods.

Supported Span Length and Additional Piers

For smaller structures, using 2x4 boards can be feasible but requires careful consideration of the unsupported span length. You should cut the spans of the boards down by using additional piers. By making the spans half as long as the system allows for a 2x6 board, you can significantly reduce the bending moment, allowing 2x4s to span adequately.

It is important to ensure that the depth of the support beams provides sufficient attachment points for screws. Avoid placing the boards directly against the soil, as this can lead to premature rotting. Use pressure-treated lumber and exterior-grade hot-dipped galvanized or stainless steel screws to enhance the durability and longevity of your deck.

Professional Consultation

If you are planning a larger or more permanent structure, it is advisable to consult with a professional for guidance. They can provide valuable insights and ensure that your project adheres to local building codes and safety standards.

By considering these factors, you can build a safe and durable floating deck using 2x4 boards as support beams in conjunction with concrete deck blocks. With proper planning and the right materials, your deck can provide a beautiful and functional space for relaxation and entertainment.