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Thread: Mixing copper and borate wood preservative

  1. #1
    Join Date
    Mar 2009
    Location
    Texas
    Posts
    7,105

    Default Mixing copper and borate wood preservative

    I've got some copper based wood preservative. And some borate powder preservative.

    Is there any downside to mixing them prior to application? Or a preferred order?

    The separate instructions are not helpful.

    Wood shutters wrapped in metal. Low risk project.

    Thanks

  2. #2
    Join Date
    Jan 2003
    Location
    New Zealand's Far North
    Posts
    10,197

    Default Re: Mixing copper and borate wood preservative

    I dont know of any application where the two are mixed, so cant help there, but it may pay to look into the effects of your copper based preservative on the metal wrapping of your shutters.
    What brought this to mind was my building some gang nail trusses years ago, and learning that we should only use boric treated wood, as copper based preservatives could adversely affect the galvanised nail plates.
    There is nothing quite as permanent as a good temporary repair.

  3. #3
    Join Date
    Mar 2009
    Location
    Texas
    Posts
    7,105

    Default Re: Mixing copper and borate wood preservative

    Thanks. I’ll check it out.

    I’m not sure any treatment is needed. These things are going to be fully wrapped in metal, in Texas, with weep holes in the bottom. This may just be a waste of time. It would not be optimal to make it worse with copper rusting the siding.

    Edit: That was a close miss. Would have been fairly disappointing. Thanks you for the tip. Copper is out. Borate is in.

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    Last edited by bluedog225; 03-05-2021 at 09:28 PM.

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