Installing expanson anchor bolts

Discussion in 'Framing and Foundation' started by HighDesertHomeOwner, Mar 18, 2011.

  1. Mar 18, 2011 #1

    HighDesertHomeOwner

    HighDesertHomeOwner

    HighDesertHomeOwner

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    Can I simply place expansion anchor bolt into the concrete before it sets?

    Do I have to drill on the concrete after it is set?

    Or is it best to insert slightly small diameter rod, say 7/16, and just drill slightly to 1/2 inch for 1/2 inch anchor bolts.

    I am talking about the type of anchor bolt that expands as you tighten. It is first pounded into the concrete, but as one tightens the bolt expands in diameter.

    Thanks

    Also, are this type of anchor blots good for pressure treated lumber sill?
     
  2. Mar 18, 2011 #2

    nealtw

    nealtw

    nealtw

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    You can buy concrete bolts made to put into wet concrete and they are much cheaper than ancher bolts. Either way just buy plated or dipped bolts. We order bolts from the concrete company , they come with the ready mix trucks.
     
  3. Mar 20, 2011 #3

    joecaption

    joecaption

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    It would be best if you told us what it is your really trying to do this for. Is it a new slab that's being pored, an old slab that your adding walls to ECT.
    If it's a new wall you all ways install the foundation bolts as it's being pored.
    If its an old slab then you can drill and set the bolts in epoxy (there sold in any box store in the same area the Joist hangers are sold) or even just use Tap Con screws.
     
  4. Mar 21, 2011 #4

    HighDesertHomeOwner

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    New slab for a small 7.5'X16' shed but in a windy area.

    The slab will be 4" thick with many rebars.

    I will be using PT 2x4 as sills.

    Shed roof with combined rafter/ceiling joists in the same piece of 2x4.

    Two bird's mouth cuts on each rafter/ceiling, the span of the two bird's mouth cuts is 7 feet.
     
    Last edited: Mar 21, 2011
  5. Mar 21, 2011 #5

    HighDesertHomeOwner

    HighDesertHomeOwner

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    I just realize that may be pouring in just a small amount of epoxy, as little has half a teaspoonful, into the anchor hole and then tighten will greatly strengthen the bolts. It won't loosen.
     
  6. Mar 21, 2011 #6

    mudmixer

    mudmixer

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    Any Santa Anna winds?

    Dick
     
  7. Mar 22, 2011 #7

    HighDesertHomeOwner

    HighDesertHomeOwner

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    Thanks

    I have decided to not use wedge expansion anchor and to use L shape cast in bolts.

    0.5 inch and 6 inches long. I will leave 2.25 inch up. I figure 1.5 inch for the PT 2x4 leaving 0.75 inch for the nut and washer.
     

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