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    charliea's Avatar
    charliea Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Jul 26, 2009, 11:28 AM
    I am building a truss roof over a flat roof.the size is 9'wx9'd.where do I begin this
    I am building a gable roof over a flat roof at our church.It is 9'wx9'l.How do I determine the height of the center rafter?
    hkstroud's Avatar
    hkstroud Posts: 11,929, Reputation: 899
    Home Improvement & Construction Expert
    		  
    #2

    Jul 26, 2009, 01:48 PM

    By center rafter do you mean ridge board or beam?

    First determine how much overhang or eve you want to have.

    Let's say that you want a 1' overhang. That would make your total width 11'.

    Your run is then half that or 5" 6"

    Next determine how much pitch you want. A 12 in 12 pitch (pitch that rises 12" for every 12" horizontal run) would mean that the top of your ridge board would be 5' 6". That's a pretty steep pitch (45 degrees). A 6 in 12 pitch (22.5 degrees) would make the ridge board half the run or 2"9" high.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #3

    Jul 26, 2009, 01:48 PM

    Tell us the pitch you want.
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