Username or Email Address
Do you already have an account?
Forgot your password?
  • Log in or Sign up

    VWVortex


    Results 1 to 5 of 5

    Thread: Fasteners for treated lumber - decks and outdoor structures

    1. Member DHill's Avatar
      Join Date
      Jan 8th, 2002
      Location
      Ohio
      Posts
      3,561
      Vehicles
      98 VW GLX, 2012 Silverado, 2012 Honda CRV, 61 Impala
      04-09-2012 01:33 PM #1
      In the process of building my deck I learned that a lot of the fasteners aren't designed for use with the treated lumber beause the copper-based solution introduces a galvanic couple with the fasteners and accelerates their demise. Seems like a big oversight on the part of fastener manufacturers to not respond to this problem sooner.

      Simpson Strong Tie recommends hot dipped galvanized fasteners yet right on the shelf at Lowes next to their decking connectors they are selling a box of mechanically galvanized structural screws. The mechanically galvanized fasteners are just tumbled in zinc and the adhesion isn't as strong.

      In any case the zinc doesn't stand a chance against wet treated lumber. Simpson Strong Tie also recommends that you don't use stainless fasteners with their galvanized steel connectors because that creates a galvanic couple as well and can turn the connector into the anode.

      So there isn't any real answer, though I would guess that the stainless screw + galvanized SST is a lesser evil than zinc plated screws in treated lumber. In the end I used Grip Rite epoxy coated screws (green) because they are supposedly rated for treated lumber in outdoor conditions.




      Any experience anyone else can share?

      A bit more on how I addressed some of those issues:
      http://davionhill.blogspot.com/2012/...rs-can-be.html

    2. Moderator Rockhead261's Avatar
      Join Date
      Jan 5th, 2004
      Location
      Brewster, New York
      Posts
      3,936
      Vehicles
      '75 Eldorado vert, '13 Sierra Denali CC D/A, '11 Outback 3.6R
      04-09-2012 04:56 PM #2
      Hot dipped is the way to go.

      BTW, you should toenail the joists to the ledger and wrap the joist hanger around them. This ensures the height is uniform.

      Good tips here
      Cary

      '13 Sierra Denali 2500 CC D/A
      '11 Outback 3.6R
      '12 FLHTCUI
      '75 Eldorado ragtop

      Forum Rules

    3. Member Mk1Racer's Avatar
      Join Date
      Apr 16th, 1999
      Location
      NJ
      Posts
      19,910
      Vehicles
      '01 B5.5 wagon, '81 Scirocco, '04 FXDWG and too many A1,2, & 3 cars to remember. '93 Miata for S&G
      04-10-2012 10:50 PM #3
      What 'big oversight'? Hot-dipped galvanized nails have been around for years.
      Quote Originally Posted by MRVW00
      my GF's love to show me their t!ts....and I like to motorboat them so much they call me Chris Craft...

    4. Member
      Join Date
      Feb 11th, 2009
      Location
      Lewiston, Maine
      Posts
      4,613
      Vehicles
      2001 Wolfsburg Jetta
      04-11-2012 12:21 AM #4
      Quote Originally Posted by Mk1Racer View Post
      What 'big oversight'? Hot-dipped galvanized nails have been around for years.
      Most hangers aren't used in pressure treated lumber.
      Quote Originally Posted by winstonsmith84 View Post
      Tax? I don't mind paying state sales tax. Every time a see a pothole, a school that is falling down or a canceled essential state program, I remind myself why.
      Quote Originally Posted by Tornado2dr View Post
      535 members of congress plus 1 pres screwing us all the time...that's dirty pirate hooker level gang rape.

    5. Member Mk1Racer's Avatar
      Join Date
      Apr 16th, 1999
      Location
      NJ
      Posts
      19,910
      Vehicles
      '01 B5.5 wagon, '81 Scirocco, '04 FXDWG and too many A1,2, & 3 cars to remember. '93 Miata for S&G
      04-11-2012 07:17 AM #5
      Quote Originally Posted by Egilbe View Post
      Most hangers aren't used in pressure treated lumber.
      I understand this, but I still don't understand what the supposed 'big oversight' is. HDG versions of common nails have been around for years. I used to sell all kinds of Simpson hangers. Most are spec'd w/ a 16d common nail as a fastener, w/ other nail sizes listed as alternates, w/ a reduction in load capacity. The most common alternate that I've seen used w/ standard joist hangers in outdoor deck construction are 10dx1.5" HDG nails, often referred to as TECO nails. IIRC, when using TECO nails w/ Simpson hangers, you reduce the load capacity by ~35%. You still need the full-size 16d common nail for the shear nails. Although many will just use 10d common nails for the shear nails, as that's what is used for most of the general framing.

      To the OP, IIRC, drywall-style screws, coated or not, are not listed as approved fasteners for Simpson hangers. I believe any approved screw-type fastener has to have a flanged head and be of the appropriate size.

      /edit

      OP, I read your blog on this project. You seem to have done a lot of research on this, but also seem to have missed that those coated screws are not approved fasteners for your hangers. And using a 1 1/2" 8 (or maybe it's a 1 1/2" 6) stainless sheet metal screw in a place that you refer to as 'structurally important', is not doing you any good. You essentially spent extra money for an inferior fastener (not as strong and wrong type of thread).

      And had you looked on the Grip-Rite page, you would have seen that all of their HDG fasteners meet ASTM A-153 and are approved for use w/ treated lumber. You would have also seen that you could have gotten common nails w/ the Prime-Guard Plus coating, if you didn't want to use HDG fasteners.

      One of the things I gather from your blog, is that you think that using a threaded fastening system is better than using the correct nail fastening system. That is just not the case when the threaded fastener is not rated for the application. One thing I will commend you on though, is using the Ledger-Lok fasteners to attach the ledger board to your house. Those things are great, and have made ledger installation a lot easier than the old pre-drill and lag screw method.
      Last edited by Mk1Racer; 04-11-2012 at 07:58 AM.
      Quote Originally Posted by MRVW00
      my GF's love to show me their t!ts....and I like to motorboat them so much they call me Chris Craft...

    Posting Permissions

    • You may not post new threads
    • You may not post replies
    • You may not post attachments
    • You may not edit your posts
    •