This is an extension to a previous question. I would like to know what effect the type of decking used will have on the answers provided. This question comes from the fact that although the best option from the previous question seemed to be moving up to 2×12, I don't think I have the clearance for it. Therefore, I have to stay with 2×10 framing and need to consider the other ways to provide extra stiffness.
I am leaning toward using a composite decking. For the sake of the question, let's work with the assumption that we're using the typical sort of composite, like a Trex or a TimberTech just to name two. Those seem to come in 1" (0.94") thicknesses, at least as a standard.
Ultimately the question just boils down to whether I gain or lose stiffness just by choosing composite deck boards. Then I can consider what else I have to do in the framing beyond that in regard to the overall stiffness problem.
Best Answer
The decking is not the main structural part of a deck. That should be the posts and the joists. If you need more support or stiffness, add larger joists. If you have no clearance for that, add MORE joists at closer spacing.
While the deck itself does add some stiffness and support, that's secondary and it will not do what you are wanting.