Wood vs. Composite Decks - --- - Great Day ImprovementsDiscover the benefits of both wood and composite decking options for your home. ... Boards might be hollow or solid. Hollow boards are cheaper than solid boards and don't tend to expand and contract as often as solid boards do; however, when they do shift, they tend to do so in only one area. Additionally, hollow boards are not as sturdy and can hold water internally, which in turn can lead to warping and ... "If using PT wood decking," says Tom, "it's best to use #1 2x6 kiln dried.