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Thread: truss equations

  1. #1
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    truss equations

    Finally got the go ahead from the city and swmbo to start the planning stages for my little shop/storage shed. Initial building size is 14 x 28, hopefully with a 6/12 slope on the roof. I have been searching for the math needed to calculate the height and length of my trusses, but am not understanding the little I have come up with. If I am understanding this correctly, I should have about a 1 ft. overhang on each side, making my truss length about 16 ft....right? So where do I go to crunch out the height of the peak? In case you haven't noticed, math is not my strong suit.....but then again, neither is woodworking!

  2. #2
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    Get a hold of Rennie, that's how he made his living.
    "There’s a lot of work being done today that doesn’t have any soul in it. The technique may be the utmost perfection, yet it is lifeless. It doesn’t have a soul. I hope my furniture has a soul to it." - Sam Maloof
    The Pessimist complains about the wind; The Optimist expects it to change;The Realist adjusts the sails.~ William Arthur Ward

  3. #3
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    RETIRED(!) in Austintown, Ohio
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    For a 6/12 slope, with a 16 foot overall width, you'd want the rise to be four feet (48") over the eight foot run (half the truss width), and that'd make the rafters about 8'9˝" long.
    Jim D.
    Adapt, Improvise, Overcome!

  4. #4
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    If the bottom cord of your truss is 16 feet. Half of that is 8 feet. you have a 6/12 pitch which means for every 12" in run there is a 6" rise. So 8 feet times 6" = 48" or 4 feet. Now if you have the math skills Jim has you know how to get the third leg of the equation. In theory the math tells you how long the rafter should be. Me I just measure it cause 9 out of 10 times the theory and the real world don't mix.
    It could be worse You could be on fire.
    Stupid hurts.

  5. #5
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    thanks guys, seeing it written down on paper in front of me made me realize how easy it really was, couldn't see the forest for the trees. Thanks again

    ron

  6. #6
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    Quote Originally Posted by Chuck Thoits View Post
    ...I just measure it cause 9 out of 10 times the theory and the real world don't mix.
    See the tagline on my signature? It's true more times than not!
    Jim D.
    Adapt, Improvise, Overcome!

  7. #7
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    Quote Originally Posted by Jim DeLaney View Post
    See the tagline on my signature? It's true more times than not!
    That's what I said Jim
    It could be worse You could be on fire.
    Stupid hurts.

  8. #8
    Join Date
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    When I built the addition to my shop building, a friend suggested contacting a local truss company for a quote. They do trusses for any size structure all the way up to major apartment complexes. I was pleasantly surprised when the quote for professionally engineered trusses was for no more than the materials would have cost me, to say nothing of the time savings. It might be worth checking into in your location.
    Bill Arnold
    Citizen of Texas residing in Georgia.
    NRA Life Member and Member of Mensa
    My Weather Underground station

  9. #9
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    falcon heights, minnesota
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    just for the fun of it, i looked for an online truss calculator. i punched in your numbers, and this is what it came up with.

    RAFTER LENGTH CALCULATOR

    Overhang:1' 0" 0
    Span: 14' 0" 0

    Your results are as follows:
    Units in Feet (Span)= 14
    Units in Feet (Overhang)= 1

    Slope = 8' 11" 5/16"
    benedictione omnes bene

    www.burroviejowoodworking.com

    check out my etsy store, buroviejowoodworking

  10. #10
    Join Date
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    Dan your math don't agree with Jim"s math
    See there ya have it my way of just plan measuring bets math every time
    It could be worse You could be on fire.
    Stupid hurts.

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