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Thread: Scissor joist

  1. #1
    Join Date
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    Question Scissor joist

    This home was built in 05. The back wall in the crawl space has a knee wall and then a sill for the joist. Does the sill need strapped to the knee wall top plate?
    The joist sit on the sill and has one toe nail in it. How are they suppose to be secured?
    Does the joist sitting on the top plate spanned between two studs need support under it. It is a two storey home?

    I appreciate any quick replies because I have to get this off first thing in the morning. Thanks in advance.

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  2. #2
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    Default Re: Scissor joist

    Opps forgot the pictures

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  3. #3
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    Default Re: Scissor joist

    Any chance the exterior sheathing is nailed off properly to tie everything together laterally?

    Jim Luttrall
    www.MrInspector.net
    Dallas, Texas

  4. #4
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    Default Re: Scissor joist

    I don't know the name of the sheathing but its those 4x8 panels that are about 1/8 thick. There water repellent. Don't remember what they are made of put are very flimsy. As far as being nailed correctly I doubt it but can't be sure.

    Mike Schulz License 393
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  5. #5
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    Default Re: Scissor joist

    Got a picture of the outside of the house?

    Scott Patterson, ACI
    Spring Hill, TN
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  6. #6
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    Default Re: Scissor joist

    Here they are.

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  7. #7
    Martin lehman's Avatar
    Martin lehman Guest

    Default Re: Scissor joist

    I don't believe the joists need support directly beneath them, as there is a double top plate installed.
    As far as nailing goes, I am unsure for trusess, but conventional framing is 3 8d nails toe nailed to the top plate.


  8. #8
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    Mar 2007
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    New Mexico
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    Default Re: Scissor joist

    There would not be any strapping here in my area. It has been about four years since I did any framing, but I know we wouldn't have back then. It may have changed. Then again, we're definately not in a hurricane zone, or even a high wind zone.

    Jim Robinson
    New Mexico, USA

  9. #9
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    Default Re: Scissor joist

    Would a single nail be sufficient for fastening?

    Mike Schulz License 393
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  10. #10
    Martin lehman's Avatar
    Martin lehman Guest

    Default Re: Scissor joist

    You sould probably try and look up the manu. specs.
    I'll bet they require one on each side of the flange, for a total of two.


  11. #11
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    Utah
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    Default Re: Scissor joist

    If there are two stories above the wall it should be framed with 2x6 studs or 2x4 at 12" O.C.


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