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Thread: snow load trusses

  1. #1
    Join Date
    Mar 2006
    Location
    Traverse City, Michigan
    Posts
    13

    Default snow load trusses

    on a truss with a 6/12 pitch, and a peak being about 11' high does the 2x4 prefab meet the snow load for norther Michigan.

  2. #2
    Join Date
    Dec 2003
    Location
    Kent, WA
    Posts
    8,427

    Default

    Not enough information to tell. It depends on how often the diagonals are placed and the distance the trusses span. When you buy a truss, you usually specify the load you want it to hold, the span it must cover, and they tell you which ones will work.
    Mark
    Kent, WA

  3. #3
    Join Date
    Mar 2006
    Location
    Traverse City, Michigan
    Posts
    13

    Default

    Thanks we'll find out latter when we order them.

  4. #4

    Default

    Does anyone know what "safety factor" is built in to a roof truss for snow load.?
    if, say ,the trusses are calculated to a roof snow load of 47 psf (live load) we assume that an additional load of 1 lb per sq ft(4 would not collapse the truss, But at what point would the truss actually become close to or actually break, etc.
    This has always been a puzzle.
    Any one have any info,? it would be much appreciated.

  5. #5

    Default

    Michigan is a unique state concerning snow load. You have the lake affect concern in your area . Snow load in Michigan ranges from 25 pound to 60 pound depending on the area of the state you are in. For your safety I would definitly contact you local inspector and ask the loading stats for your jurisdiction. Michigan changes by the mile in their rating depending on how close to the lake.

    Safty loading is calculated into the Codes calling for more than absolute minimum to ensure safety but how much cushion is there is not known by me. When an engineer calculates shear etc. they have the decision made by their own design beliefs accepting the liability of their designs. Safety margin would vary greatly engineer to engineer. Some push the envelope and some go over board above safe margins depending on the engineer you get. Just remember an engineer is trying to make money while protecting thyself in liability, pressure from the customer about money is often the driving force as to how safe to make safe in their deisgn. PIcture yourself the engineer in the design accepting liability of design. How far you you push the safe line to get the job of design on that project? Everything in life seems to focus around money and how much to spend for that safety margin.

    Hope this helps

    Wg

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