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    Default Concrete pier base top surface



    After building a deck/platform for my CGX-L mount and 6" Skywatcher refractor I realized I would need a pier independent of the deck. To attach a Skyshed 8.5 pier I used a 14" sonotube with a bolt template on top.
    After waiting the suggested 72 hrs for curing I remove the template. The top of the concrete (about 3/4 inch below the top of the sonotube) is level but very rough with some low spots and stones sticking above the average height of the concrete. I'm concerned that without a continuous flat surface for the mount plate on the Skyshed pier may be unstable.

    I,m thinking that something like concrete floor leveler (about 1/8 to 1/4 thick) might work. I,m thinking that even if the leveler later degrades or cracks it will still be filling those highs and lows.

    Anybody had the same issue? It's tempting to put a thin piece of EPDM in there but I believe I've read that "padding" is a bad idea.
    Suggestions?

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    Default Re: Concrete pier base top surface

    Hopefully your embedded bolts are fairly long. The standard method is to run a nut down each bolt just above the concrete. Place a washer on each bolt and then your pier, next washers, and finally the top nuts. With this method the top of the concrete is never touched and you use the nuts as jacks to level and bind the pier in place.

    Bruce
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  3. #3
    56jimalexander's Avatar
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    Default Re: Concrete pier base top surface

    Sorry for the delay Bruce. What you suggest turns out to be what I did.
    Thanks, Jim

 

 

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