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  1. #1
    Join Date
    Apr 2019
    Location
    NSW
    Age
    38
    Posts
    309

    Default Dyna bolt/anka screw sandstone

    Hi everyone.

    We've recently had some large standstone blocks installed and I'm looking to add some aluminium batten fencing ontop.

    My question is about attaching the posts to the blocks, the normalish way I'm pretty sure is to core drill and grout the posts in.

    How ever im wondering if anyone has ever used anka screws in sandstone before? Or is it just too soft for the threads to bite in and hold?

  2. #2
    Join Date
    May 2011
    Location
    Albury
    Posts
    279

    Default

    Anka screws are rubbish for attaching any materials that will be subjected to any kind of buffeting from wind, gates opening/closing etc. even if they're in brick or concrete. I would expect that you are correct that sandstone, being a softer material, would not hold an Anka screw for even very light duty purposes. Dynabolts would do an equally poor job as you would risk cracking the stone. A system using chemical fixing methods would be the way to go.

  3. #3
    Join Date
    Apr 2018
    Location
    Nsw
    Age
    64
    Posts
    558

    Default

    Core drill it or if you prefer a fixing bolt system use epoxy injection and a stud which you can get in a standard silicone gun cartridge. By far the easiest way to go

  4. #4
    Join Date
    Aug 2004
    Location
    Perth WA
    Posts
    355

    Default

    The simple answer is to do a test with both. You might be surprised how good the gripping power of an anka screw is. For a dyna bolt if its not to close to an unsupported edge then that should be ok to.
    Experienced in removing the tree from the furniture

  5. #5
    Join Date
    May 2012
    Location
    Woodstock (Cowra)
    Age
    75
    Posts
    832

    Default

    Chemset.
    Not knowing the density of the particular sandstone you are using it could vary from very soft (almost chalky) very coarse sand like, to very dens (like iron stone) very fine high density stone and also if it has clearly defined grain patterns or mono coloured with virtually no grain pattern and also how big are these blocks and proximity to an edge will the anchors be.
    The person who never made a mistake never made anything

    Cheers
    Ray

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