I've had several quotes by "licensed" contractors to have my deck redone in composite decking. All of them refuse to put it on my current joists, which are 16" on center. They won't warranty the deck unless it is 12" on center. I get it, they have a business model, warranty model, etc. that demands they do that.

I'm just gonna take some vacation time and knock it out myself.

In reading the manufacturer specs on this composite decking, 16" centered joists are fine (they say "maximum span").

So, who has experience with this? Should I worry about putting it down on 16" centered joists? Is it going to bow?


Public Land Owner