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  1. 14th July 2004, 04:30 PM #1
    capedcrusader
    capedcrusader is offline Member
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    Default Bolt fixing CCA treated Hwd

    Hello All
    Im replacing termite eaten top wall plates with hardwood and bolting lengths together/reinforcing the wall corners with mild steel brackets. I bought F14 roughsawn framing hwd some of which turned out to be CCA treated spotted gum which caused surface rust on mechanically zinc coated bolts within 1 month and has produced white powdery **** on hotdippedgalvanised bolts even after having coated the buggers with grease. I want what im doing to be permanent ie:to last until I die at least so i was wondering if anyone has any experience with bolting CCA timber / general suggestions. I thought of using stainless steel bolts but this would cause a galvanic reaction with the mild steel brackets.
    Thanks for any advice.
    Last edited by RETIRED; 14th July 2004 at 06:27 PM. Reason: Keep it nice!!
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  3. 14th July 2004, 05:19 PM #2
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    jackiew
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    might be wrong here ( if I am someone will correct me ) but I thought that you had to use galvanized fixings with CCA timber ... ooops just saw that you'd tried that as well ?

    interesting how the censor let the f word get through :eek:
    no-one said on their death bed I wish I spent more time in the office!
  4. 14th July 2004, 05:21 PM #3
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    TOMARTOM
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    I think Sachs Robertson recommend an epoxy coated screw to minimise corrosion/reaction to the treated timber

    regards
    tony
  5. 14th July 2004, 05:55 PM #4
    ozwinner
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    Quote Originally Posted by jackiew
    might be wrong here ( if I am someone will correct me ) but I thought that you had to use galvanized fixings with CCA timber ... ooops just saw that you'd tried that as well ?

    interesting how the censor let the f word get through :eek:
    I thought that too, yet it caught out .

    Al
  6. 14th July 2004, 06:29 PM #5
    RETIRED
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    Fixed now.
  7. 14th July 2004, 06:32 PM #6
    ozwinner
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    Thumbs up

  8. 14th July 2004, 06:38 PM #7
    Theva
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    Caped,

    Gal bolts are the norm for CCA treated wood. There are epoxy coated screws but the sizes are smaller, up to 14g.

    If you want to be sure to be sure then painting the bolts is a better option than greasing or, if you plan to live really really long then consider SS bolts.

    Well done .

    Regards,

    Theva
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