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    Robin Stinson's Avatar
    Robin Stinson Posts: 2, Reputation: 1
    New Member
    		  
    #1

    Mar 20, 2007, 01:58 AM
    Installing Waste Pipe in a Concrete Slab
    I am extending my shed and adding an outside Bathroom, with a toilet, shower and basin. The flooe will be poured concrete. My questions are
    1. Do I need to cover the Pipe before I pour the concrete
    2. What drop / sloop needs to be in the waste pipe
    3. How far should the waste pipes be below the concrete slab?
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
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    #2

    Mar 20, 2007, 08:39 PM
    Drain pipes that carry poopies have a minimum of 1/8 inch per foot slope [fall]. Drain pipes that do not carry poopies must have a minimum of 1/4 inch per foot fall. You need 4 inches of fill dirt on top of the pipes. You need a minimum of 3 1/2" of concrete thickness. i personally do no cover drain pipes that penetrate vertically through concrete. the toilet must be a minimum of 3" through out.
    Robin Stinson's Avatar
    Robin Stinson Posts: 2, Reputation: 1
    New Member
    		  
    #3

    Mar 20, 2007, 10:01 PM
    Doug238,
    Thank you for your help.
    I had intended pushing the outlet pie up against the Footing boards with the Female end pointing out so that I can fit the next set of pipes in.

    Is that how you would recommend or should I try to have the waste pipes running through the waste pipes running through to footing extending beyond the edge.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #4

    Mar 21, 2007, 10:13 AM
    Quote Originally Posted by Robin Stinson
    Doug238,
    Thank you for your help.
    I had intended pushing the outlet pie up against the Footing boards with the Female end pointing out so that I can fit the next set of pipes in.

    Is that how you would recommend or should I try to have the waste pipes running through the waste pipes running through to footing extending beyond the edge.
    When we run bell and spigot pipe the spigot end goes with the flow. In other words it goes like this. Hub**spigot**hub**spigot and so on.
    You're proposing to install it backwards. Good luck, Tom
    doug238's Avatar
    doug238 Posts: 1,560, Reputation: 62
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    #5

    Mar 21, 2007, 08:50 PM
    A pipe installed horizontally through a footer must be sleeved with something at least 2 pipe sixes larger than your pipe in case of the footer settling.
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