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

    Apr 12, 2007, 12:39 PM
    Specicifications on sewer pipes
    Does anyone know what the minimun allowed sag in a sewer pipe is?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
    Home Repair & Remodeling Expert
    		  
    #2

    Apr 12, 2007, 01:16 PM
    I guess you are talking about the slope which should be 1/4" per ft.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #3

    Apr 12, 2007, 04:53 PM
    While 1/4" to the foot is the best the absolute minmun fall allowed on a sewer line is 1/8 inch to the foot.
    iamgrowler's Avatar
    iamgrowler Posts: 1,421, Reputation: 110
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    #4

    Apr 12, 2007, 05:02 PM
    Quote Originally Posted by speedball1
    While 1/4" to the foot is the best the absolute minmun fall allowed on a sewer line is 1/8 inch to the foot.
    1/8" grade is only allowed if you increase the pipe by one full pipe size, right?
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #5

    Apr 12, 2007, 05:09 PM
    We just "crack the bubble" on all our 4" installations. No complaints over the years as yet. Cheers, Tom
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