I am putting down composite decking using screws with joists 12" on center. Can I use screws every 24"?

Question

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.

Answer 1

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 s******g it on 24 inch centers with 2 screws and maybe 1 s***w in the center of the odd joist.

Answer 2

Why scrimp on screws?  Build a proper deck, placing  a s***w at every joist.  Counter sink them too, for a nicer finished product.

Answer 3

I'm looking at using a composite decking and I couldn't find anything about this.  I would assume that you s***w at every joist.  If your joists are at 12" then I would s***w each one.  I wouldn't go 24" as you could have warping.

Answer 4

It'd be sturdier to go every joist,  if cost was an issue i would have gone joists every 18" centers you'd have saved on joists as well as screws.