apart should the floor joists be when using composite decking

For residential decking the space between deck joists should never exceed 16 inches as measured on center (16 inches between the center of adjacent joist boards). If you prefer a more rigid feel opt for 12 inches spacing on center. 【Get Price】

When replacing the existing boards with composite decking on a deck with 24-inch frame spacing you will only need to add joists 12 inches on center between existing joists. For decks with 16-inch spacing measure and mark each joist that is at 48 inches. Remove all unmarked joists and rehang at 12 inches on center. 【Get Price】

If the floor joists that span the length of your deck are installed too far apart the boards on top will sag. If the joists are not all the same exact height the deck’s surface will be uneven. It’s common sense that the less space there is between joists the sturdier your deck will be. 【Get Price】

3) Joists are Set Too Far Apart . Another mistake to avoid when installing composite decking is spacing the joists too far apart. Current building codes require that all decks should be supported with a minimum of 2”x 10” pressure treated pine joists that are spaced 24” apart (although 16” OC is standard building practice). 【Get Price】