Trex Decking Joist Spacing
Trex and other composite decking brands are considerably heavier and more flexible than wooden surface.
Trex decking joist spacing. Those railings are not true 6 72 or 8 96 in length. Most composite and pvc decking brands like trex and azek recommend a minimum joist spacing of 16 inches oc. Deck joist spacing should never exceed 16 on center with the exception of max deck boards which allow for maximum 24 on center.
For a more rigid feel 12 or less may be preferred. You also may have to install more stair stringers. So when would you ever need to use 12 inches oc.
If adding additional framing be sure to keep all boards level and in plane across the tops. What is frame spacing for trex decking. Some brands like weardeck let you get away with more reinforced with a layer of fiberglass on both the top and bottom weardeck boards easily allow for spans of 24 inches oc.
When designing a new trex or composite deck the spacing between floor joists should be 12 inches on. Trex signature railing and rod rail are made to be installed at maximum 6 or 8 clear span between posts.