What joist spans should I use for my deck when using Trex decking?

For Trex 5/4x6 deck boards, the joist spacing should be no more than 16" on center for residential applications, which is the same span generally recommended for wood. Trex 2x material should be installed at no more than 20" on center for residential applications and no more than 16" on center for commercial projects. A high strength 2x6 product is available for 24" spans.

When installing Trex deck boards on a 45 degree diagonal to the joists, reduce spans by a minimum of 4 inches. Special applications/loading conditions will require engineering analysis and/or reduced spans. More.

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