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    Slushy's Avatar
    Slushy Posts: 1, Reputation: 1
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    #1

    Dec 3, 2009, 04:39 PM
    How to find the rafter length with a 5/12 pitch and a 6 inch over hang
    How to find the rafter length with a 5/12 pitch and a 6 inch over hang. The dog house is 3 ft wide by 4 ft long
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #2

    Dec 3, 2009, 09:18 PM

    Run is 1/2 the width plus the over hang.
    (36/2)+6=24
    Rise is 5" for ever 12" run or 10"
    Rafter length = A squared plus B squared = C squared
    (24x24)+(10x10)=676
    Sq rt of 676=26"

    If you are using a ridge board subtract 1/2 thickness of ridge board from run.
    2x4 ridge board=
    (23.25x23.25)+(10x10)=640.56
    Sq rt of 640.56=25.31=25 and 7/16
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