Most composite decking materials require 16" on center spacing for straight decking and 12" on center joist spacing for 45 degree angle diagonal decking. Also, many composite decking materials require 12" or even 10" on center stair stringers spacing to support composite stair treads.
This may mean decreasing the joist spacing by 2 or more inches, depending on the overall dimensions of the deck. 2 Lay the longest span, which is the one that extends from one corner of the deck
Deck joist span for diagonal non-wood decking (post #) Diagonal is weaker, since the actual span is 1.4 times the joist spacing. That makes the span across 16-inch-spaced joists about 22 inches. My question was about if the span is the same. Obviously if the joists are the same, then diagonal will create a longer board span. But
AZEK Deck Install Guide Joist spacing should never exceed 16” on center. For a more rigid feel, 12” may be preferred. DIAGONAL INSTALLATION SUBSTRUCTURE 12” on center maximum joists. More severe angles may require closer joist spacing. Extreme Heat Warning
Depending on the decking material you are using you may need to reduce your joist spacing to 12” on center to help support the diagonal span. Some deck builders will tell you that applying decking diagonally will increase your waste factor by 15 percent.
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