Free Deck Plans
Free Deck Plans
Choose from hundreds of permit ready designs. Our deck plans include a detailed framing plan, footing layout, material list and typical details. These plans are free to download as pdf files that can be printed to 1/4" - 1' scale on 11x17 paper.

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Joist spacing for composite decking

Before building a composite deck always read the installation instructions from the manufacturer paying special attention to the required joist spacing.  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.  If you are reinstalling composite decking over an existing frame you may need to install new intermediate joists or stair stringers to meet the installation requirements. 


Comments, Questions and Reviews


I would always recommend 12" on center . From my experience the composite decking in straight sun tends to warp al to more than on 12 ". also after 15 Years looks worn out .

posted by FRANK at 1/27/2015 5:13:06 PM