1. mike48114

    mike48114 LawnSite Member
    Messages: 124

    I am using Cement Screws to ancor a shed I built to the concrete slab below. Do I have to pre drill holes?
  2. JeffY

    JeffY LawnSite Senior Member
    Messages: 324

    You shouldn't have to pre-drill the holes as long as you got a heavy-duty drill to help out. IMO, I would have installed lag screws upside in the concrete while it was still wet and drill a hole in the bottom plate for it and just washer and nut it. But you can't really do that if it's an existing concrete pad.
  3. Arc Burn

    Arc Burn LawnSite Member
    Messages: 67

    I would use concrete anchors instead of screws,like 3/8 or so,drill a hole set it in use a washer and nut and as you tighten the nut,the anchor expands,much stronger than the screws and not to expensive.JMO,BTW,we always drilled a pilot hole just to make it easier put you don't have to.
  4. jkkalbers

    jkkalbers LawnSite Member
    Messages: 144

    If they are Tap-con screws (the blue ones) you need to pre drill. If you buy a box of them, it comes with a bit.
  5. Lawn Tek

    Lawn Tek LawnSite Senior Member
    from u s a
    Messages: 457

    Use a hammer drill, tapcons are stong but We use a threaded stud that you drive in the hole , you cant pull it out
  6. 1grnlwn

    1grnlwn LawnSite Bronze Member
    Messages: 1,261

    ditto on the drill hole. either anchors will work!
  7. Jason Pallas

    Jason Pallas LawnSite Bronze Member
    Messages: 1,335

    Just Weld it to the cement slab - whoops, sorry I thought this was the welding forum.

    Just Kidding;)
  8. 1grnlwn

    1grnlwn LawnSite Bronze Member
    Messages: 1,261

    Ok there isn't a way to weld concrete, but did you know there is a cutting torch for concrete? It is one bad mo fo! It,s on a long pipe so the operator can stay back, way back.


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