Dont know for sure, check with the manufactureres websites, any composite that can be run at a 45 with 16" centers might handle the 24". Another thought would be to sell them on droping in new joists inbetween, that would make a nice solid deck. G
Ecoboard makes a composite that can span up to 8' if you want, depending on the thickness (up to 8" thick!!!). You can also order it reinforced. I have samples and it is used alot for commercial docks. www.ecoboard.org
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