Roof trusses, bracing, regs, plumb, bowrd

Discussion in 'Roofing and Guttering' started by 2019, 13 Apr 2019.

  1. 2019

    2019

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    Just looking online about bowed and out of plumb trusses. Am I ready this right it's saying a roof truss can be 2 inch out if plumb and it'll still be acceptable. I can't fantom a truss being out by so much. Maybe half inch max at a guess but 50mm, surely there will be issues if it's out by that much. Maybe I'm wrong and if so, what is this 50mm out of plumb below in pic.


    Below is what I understand the terms are but not familiar with Rak/b .Is there any PDF files with the truss bracing regs. Have installed many sissor trusses, attic trusses but not familiar with raised tie and it's bracing :(

    Chv/b = Chevron bracing
    Rak/b = ?
    L/b= ? Left bracing
    R/b =? Right bracing





    Screenshot_20190413-210043.png Screenshot_20190413-205908.png
     
    Last edited: 13 Apr 2019
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  3. noseall

    noseall

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    Roof trusses are rarely straight, rarely identical and rarely behave themselves (especially the flimsy fellas). There is a built in tolerance buffer which allows OCD people like me a breather when dealing with roof trusses. Once you cut through the steel banding holding them together, all hell brakes loose.
     
  4. 2019

    2019

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    I hear ya. I've installed a few trusses in my time and know what happens when one cuts the plastic strapping lol. Very flimbsy indeed.

    So when installed, if the trusses are out of plumb 50mm from top to bottom then this is acceptable. Will this not put more extra tension on the bracing band walls/wall plate.

    See OP, edited it with bracing terms. Do you know any PDF files for all regs on them. I'm very familiar with sissor trusses and attic, but not raised tie. I've a diagram I'm struggling with.
     
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