There's nothing quite like relaxing on a sturdy outdoor bench, until you feel that familiar wobble of a loose slat. To ensure your outdoor bench slats stay firmly in place season after season, you need to use the right fasteners designed to combat the elements and constant use.
The best fastener for this job is typically a weatherproof screw. Specifically, we recommend using stainless steel or deck screws. These screws are corrosion-resistant, preventing rust that can weaken the connection over time. Their sharp points and aggressive threads bite deeply into the wood, creating a strong, secure hold that resists backing out.
For added security, especially on benches that will see heavy use, consider using a screw combined with a locking washer and nut if your bench design allows for it. A lock washer applies constant pressure to the nut, preventing it from loosening due to vibration from people sitting down or moving. Alternatively, serrated flange nuts or nylon insert locknuts (nyloc nuts) are excellent for creating a vibration-proof connection without the need for a separate washer.
Another pro tip is to apply a small amount of wood adhesive or construction adhesive into the pilot hole before driving the screw. This creates a powerful chemical bond in addition to the screw's mechanical grip, effectively "gluing" the slat to the frame from the inside. This two-pronged approach is one of the most effective ways to permanently stop slats from coming loose.
Regular maintenance is also key. Periodically check your benches and gently tighten any fasteners that may have worked themselves slightly loose. By choosing the correct, durable fasteners and using these simple techniques, you can build or repair an outdoor bench that remains solid, safe, and comfortable for years to come.