If you were to draw a line down the center of two joists and then measure the distance between them as 16 inches, that measurement is 16 inches on center.īasically, instead of measuring joists from edge to edge, you should measure them center to center. ![]() The distance between two deck joists is measured in inches “on center”, commonly abbreviated as “OC”. However, if you space your joists too close together, it will be difficult to install supporting elements such as joist hangers, blocking, and flashing. It’s common sense that the less space there is between joists, the sturdier your deck will be. If the joists are not all the same exact height, the deck’s surface will be uneven. If the floor joists that span the length of your deck are installed too far apart, the boards on top will sag. Why is Joist Spacing So Important?Ī house is only as strong as its foundation, and a deck is only as strong as its frame. In this guide, we’ll go over the proper joist spacing as well as some common installation mistakes you should avoid. But sometimes, they can be a bit unclear when it comes to a crucial component of your deck frame – deck joist spacing.ĭecking manufacturers may recommend anywhere between 12 and 16 inches for commercial decks and 12 to 24 inches for residential decks. ![]() But to truly get the most out of your new composite deck, you have to start with a strong frame.Ĭomposite decking brands like Trex and TimberTech generally have their own brand-specific installation instructions. ![]() Composite decking, which is made from a combination of wood and plastic, lasts longer than traditional wood because it’s less prone to rotting, splintering, and insect damage. After weighing the options, you’ve decided you want to use composite material to build your deck or replace your old wood deck.
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