Plank Decks

Wood plank decks consist of a series of timber planks placed flat-wise and transversely across the width of the bridge, and over the supporting steel girders. Per Article 9.9.7.2, the planks are to be bolted to the steel girders or nailed to wood nailing strips that are secured to the top flange of the girder with a minimum of 0.625 inch diameter A307 bolts, spaced no more than 4 feet apart and no more than 1.5 feet from the ends of the nail strip. Wood plank decks are fairly uncommon, and should be limited to roads that carry few or no heavy vehicles, and where the running surface is constantly monitored and appropriately maintained.