Replacing a single slat on a wooden outdoor bench is a surprisingly straightforward DIY task that most people can handle in under an hour. The ease largely depends on your bench's construction, but the fundamental process is simple. First, assess the damage. Is the slat simply cracked, or is it rotten? If it's screwed in from the top, removal is easiest—just unscrew it. If it's nailed or screwed from underneath, you'll need to carefully flip the bench.
The key is matching the old slat. Carefully remove the damaged piece, using a pry bar if necessary, and take it to your local hardware store to find a matching type of wood (like cedar, teak, or pressure-treated pine) and dimensions. Ask them to cut it to the exact length. You'll also need matching exterior-grade screws or nails, a drill or hammer, a tape measure, and possibly sandpaper.
Installation is the reverse of removal. Position the new slat, ensuring even gaps on either side for expansion. Pre-drill holes to prevent the wood from splitting, then secure it with your fasteners. If desired, finish by sanding any rough edges and applying a sealant or stain to match the rest of the bench. That's it! With minimal tools and effort, you've restored your bench's beauty and functionality, saving the cost of a full replacement. Regular checks for loose fasteners and a fresh coat of sealant every year or two can prevent future slat issues.