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    Alan_H's Avatar
    Alan_H Posts: 2, Reputation: 1
    New Member

    Jul 2, 2004, 12:55 PM
    New construction floor drain
    We just broke ground on our first new home construction. We plan to do many of the sub-contractor jobs ourselves.

    One job that is coming up soon is the need to setup the basement floor drain which will be for mainly for gray water from the central air condenser (no bathrooms or laundry). I have not been able to find exact information of what we need for the floor drain.

    Here is what I believe we need:
    We will have a gray water pit in the basement floor with a pump to pump the water out to the public sewer line.
    For the floor drain we will have a drain connected to a trap with 2" PVC from the trap running into the gray water pit. All of this will be placed under the basement floor before it is poured.

    Am I missing anything (back flow preventer, etc.) or would this be what we need for the floor drain setup?

    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber

    Jul 2, 2004, 03:20 PM
    Re: New construction floor drain
    Hey Alan,  You aren't missing a thing on your floor drain layout.   However you will need a backflow preventer on the gray water  discharge line just ahead of the pump to prevent backflow after the pump shuts off.  Good luck, Tom
    Alan_H's Avatar
    Alan_H Posts: 2, Reputation: 1
    New Member

    Jul 12, 2004, 01:45 PM
    Re: New construction floor drain
    I installed my basement floor drain with a 2" trap and 2" PVC into a premade sewage pit.
    The local plumbing inspector red flagged it and said there was no vent after the trap.

    I have not talked directly with the inspector yet but my question is. The pit lid has two opening one for a vent and another for the ejection pipe. I did not put any pipes into these holes because the basement floor has not even been poured yet.
    Does he mean he wants to me to put a length of PVC pipe into the vent hole of the pit or does he mean I need to add a "T" in the 2" pipe between the trap and pit and add a vent in the middle?

    Thanks for any insight you can give me.
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber

    Jul 12, 2004, 03:31 PM
    New construction floor drain
    Hi Allen, With a 2" trap the vent must be within 5' of the trap. If you're closer then that you should be able to vent from the hole in the tank. Regards, Tom

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