Yes, outdoor benches can be bolted directly into a wooden deck, but doing it correctly is crucial for both safety and preserving your deck's integrity. While it might seem straightforward, simply driving screws into the deck boards can lead to instability and potential damage.
The most secure method involves locating the underlying deck joists. These are the sturdy horizontal beams that provide the main structural support. Using a stud finder or carefully measuring from known reference points, mark the locations of the joists where the bench legs will sit. Pre-drill pilot holes through the bench's mounting points and into the center of the joists. This prevents the wood from splitting. Then, use robust, corrosion-resistant lag bolts or carriage bolts with washers to secure the bench firmly. Bolts that go completely through the material and are fastened with a nut on the other side offer the strongest hold.
Avoid just attaching the bench to the deck boards alone. Deck boards are not designed to handle significant lateral stress and could crack or pull up over time, creating a serious safety hazard. If the bench legs don't align with the joists, you may need to install a sturdy wooden mounting block underneath the deck surface, which is itself securely fastened to multiple joists, and then attach the bench to this block.
Always check your bench's manufacturer instructions for any specific mounting recommendations. Taking these careful steps ensures your outdoor bench remains a stable and safe feature on your wooden deck for years to come, preventing accidents and protecting your investment.