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  1. #1
    wes owens's Avatar
    wes owens Guest

    Default different kind of truss system

    See many truss systems like this?

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  2. #2
    Join Date
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    Default Re: different kind of truss system

    wes,
    picture 3 looks like a two piece(hat truss) truss. with a steep roof with a wide span the trusses are too wide to haul on the road so they are made in two parts. the main section gets 2x4's nailed to the top cord for the hat truss to attach to as shown. sometimes strapping is used to connect the top cords together and you will see a requirement for roof sheeting to be split on the joint of the two trusses.


  3. #3
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    Default Re: different kind of truss system

    Wes,

    Any way to make those photos smaller?

    Those photos are so small they are hard to see, but the 3rd photo shots piggy back trusses, one piggy-backed on top of the other, but I don't see any straps or gussets holding them together.

    The other two photos show hip step down trusses with a couple of hip step down trusses missing and the top being conventionally framed instead of trusses. That *may* or *may not* be okay, depending on the truss engineering.

    It looks like they might have the OSB oriented the proper way, vertically up the roof with the long edge perpendicular with the supports.

    Again, though, the photo are so *small* (and lose resolution when zooming in) they are hard to see much in them.

    Jerry Peck, Construction / Litigation Consultant
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  4. #4
    wes owens's Avatar
    wes owens Guest

    Default Re: different kind of truss system

    What is the largest I can make the photos?

    I tried to download some the other day and it would not do it, so I had to make them alot smaller.


  5. #5
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    Default Re: different kind of truss system

    Try 600 x 800 or even 1024 x 768.

    Jerry Peck, Construction / Litigation Consultant
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  6. #6
    wes owens's Avatar
    wes owens Guest

    Default Re: different kind of truss system

    See if this is any better.

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  7. #7
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    Default Re: different kind of truss system

    I downloaded FastStone Image Viewer someone here recommended to bulk change file names and it works well with bulk changing size too. Free download to boot!

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    Jerry Peck, Construction / Litigation Consultant
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  8. #8
    Pete Lauterer's Avatar
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    Default Re: different kind of truss system

    Wes,
    Trusses of this type are common around here and almost never installed correctly. Make sure there is contact or weight bearing between the upper and lower truss at the ends. The upper and lower sections must be in contact at outside ends. Typically around here the wieght/contact point of the upper trusses ends up on the purlins. According to most manufactures that is a no no.


  9. #9
    Roger Hankey's Avatar
    Roger Hankey Guest

    Default Re: different kind of truss system

    A good resource when examining trusses is the TPI truss installation guide found at Building Component Safety Information
    click the view pdf link under the illustration of the cover. I've check it however, and it does not specifically discuss strapping or how the cap trusses are connected to the lower trusses. What I saw discussed was cont. lateral restraints and diagonal bracing. Anyway it is a useful source of information on truss installation do & don'ts.


  10. #10
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    Default Re: different kind of truss system

    Quote Originally Posted by Pete Lauterer View Post
    Make sure there is contact or weight bearing between the upper and lower truss at the ends. The upper and lower sections must be in contact at outside ends.
    Not always a correct statement.

    It depends on the design and loading of the truss and its bearing points. Most that I have seen want the bottom chord of the top truss set directly on the top chord of the lower truss, and, when the correct trusses are installed together, the bearing points line up.

    Jerry Peck, Construction / Litigation Consultant
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  11. #11
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    Default Re: different kind of truss system

    Wes.
    Middle picture, is that a split truss section?

    Jeff Moore AZ Cert#49250
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    http:www.quantumhomeinspections.com

  12. #12
    wes owens's Avatar
    wes owens Guest

    Default Re: different kind of truss system

    That would be the vertical side of a hip roof.

    Those are horizontal boards.


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