There are many material choices for building your dock. Wood is still the most common material for residential docks. It is easier to work with and less expensive than aluminum. For the frame 2x6 lumber is recommended for most applications. 5/4 x 6 material is recommended for wood decking. Plastics and wood/plastic composites may be used for decking but are usually not strong enough for the frame. A dock built with most untreated pines, firs and spruces will not last long in the demanding dock application. Western red cedar is a great choice of lumber. Treated pine is an economical alternative, however it is much heavier than cedar.
3/8-16UNC x 2-1/2" long carriage bolts with zinc plating or galvanized finish is recommended. Consult with your local lumberyard or hardware store for decking fastener selection. 1-1/4" or 1-1/2" galvanized schedule 40 pipe is used to support the dock frame above the water. Pipe is available from most well drilling companies, steel outlets, and some home centers and marine dealers.