Should 24" deck joist spacing be reduced to 16"?
The wider spacing is less rigid, you may feel a little flex as you walk. I do not like the flex so I used 16" centers. Also , if you use 2 X decking instead of the recommended 5/4"decking, it will be more rigid and last longer. My 2X decking is 20+ years old in good shape in a warm ,wet location; I have replaced about 5% because of rot ( under planters).