I am replacing a wood surface that was 2X6 pressure treated with 24" centers for the joists. I have put in joists that are now 12' on center. The joists handle the sheer or vertical load. What will putting screws every 12" accomplish from a structural stand point? I am not trying to save screws but the deck is about 800 sq. ft. so the extra work is not trivial.
With composite decking there isn't a problem with warping. However it is recommended that (depending on thickness) it be supported every 16 inches. I would try screwing it on 24 inch centers with 2 screws and maybe 1 screw in the center of the odd joist.
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