On Thu, 17 Sep 2015 08:46:57 -0700 (PDT), bob haller
wrote:

On Thursday, September 17, 2015 at 11:23:40 AM UTC-4, notbob wrote:
I know my late mom's deck was a cheapo effort. Still, got PTW for the
decking boards. Now, all the screws are rusty and pulling out and the wood is
going bad, no doubt due to no kinda deck stain/preservatives and
covering the deck with household carpenting, which held the moisture
even longer than the Rocky Mountain snows. Plus, a buddy told me PTW
will rot regular deck screws (3-1/2" ).

I plan to eventually renew the deck boards w/ new PTW boards, but what
kinda screws? I don't wanna hafta do this again.

nb

think no magnetc stainless for screws and better to use composite decking with no exposed screws for longer life
There are screws made specifically for preassure treated decking -
they are ceramic coated. Or you can use hot galvanized if you can find
them - otherwise non-magnetic stainless.

Or use cedar or composite decking. Even good spruce will last as long
as some of the crappy PT being sold today if you through a coat of
penetrating stain or Thompsons on it.