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    mkblmr's Avatar
    mkblmr Posts: 4, Reputation: 1
    New Member
    		  
    #1

    Feb 4, 2011, 10:51 AM
    Countersinking screws
    1 1/4" rock-on screws wont countersink. I'm trying to fasten 3/8" hardibacker to 3/4" particle board for a countertop finish with epoxy, so I need a flat finish surface. Is there another screw to use or different threads to use to get them to countersink?
    dclynch's Avatar
    dclynch Posts: 202, Reputation: 19
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    #2

    Feb 4, 2011, 01:52 PM
    There is a difference between "rock on" and "backer on" screws. I believe you need to use the latter to countersink with Hardiebacker.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Feb 4, 2011, 03:45 PM
    Why not drill the hole, use a countersink tool to form the angle and then drive the screw flush?
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #4

    Feb 4, 2011, 07:48 PM

    Assuming that "rock on" screws are the type with the barb under the head, you may need to use longer screws. Particle board does not have much gripping power and short screws will eat out the hole before pulling the head down below the surface.
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