re: Deck board recommendations for freshwater dock

You can get treated boards from Triple Son Wholesale Timbers in Cutoff, LA. (985)693-6829. They deliver if you don't have a utility trailer. I recommend the 2x6 rough cut boards. They are a full 2" thick and 6" wide. They also sell S4S boards that are 1.5" wide, 5.5" thick, but I would go with rough cut boards for durability, longevity, and strength. The rough cut boards are perfect for dock decking. They are relatively smooth, but are not as smooth as the S4S boards which are shaped (planed) on all four sides like the typical framing lumber sold at Lowes. The saltwater treatment is 2.5 lbs. (per cubic feet, I believe). The standard treatment is 0.80 lb. of treatment. You don't need the saltwater treatment unless the boards are constantly in the water (even freshwater). Triple Son can help you decide. Great people. Great products. Good luck with your project.