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Thread: Closing basement floor drain permanently?

  1. #1

    Default Closing basement floor drain permanently?

    I am renovating my office in the basement of our 50 year old house. In the process of removing the old carpet I discovered a kind of Ten-test (?) sub-floor about 5/8 " thick and when I removed this sub floor I found that it was supported with strapping underneath because the concrete floor was sloped or graded toward a drain whole in the middle of the floor. This drain has been covered in this way for the last thirty years.....there is no apparent water evidence in the area but over the years the subfloor did sag in locations between the strapping near the centre of the floor where the drain is located. This is not the only floor drain in the basement there is one also in the Laundry-Furnace room where the sinks are located. In my office-room I want to close that newly discovered drain permanently and level the concrete floor so that I can eventually install a underpad for a carpet and a wall to wall carpet.............Please comment on the feasibility or practicality of what I am proposing to do.

    I am assuming that this drain pipe is a gravity drain into the ground outside the house as is the one in the laundry room. Our area has no storm sewers just sanitary sewers and the house has no sump hole or sump pump. Basement has always been dry.....So I am thinking of blocking the drain in my office floor with that expanding polyeurothene then using concrete to cover over the drain opening so that by adding concrete into the graded portion of the floor I can make the whole floor in the room level and ready to accept the carpet underpad and the carpet........

    QUESTIONS: Will this work ? Will I create other problems if I block this drain?
    Any suggestions of what kind of concrete or other materials to make floor level?

    I am in Toronto Mississauga so there are lots of Ronas and Home Depots in the area.


  2. #2


    To close it I would get some water stop concrete. Follow it up with a few thin layers of vinyl flooring patch (I know itís the bag with the red label at lows in the flooring department). If you use a 4 foot level to find the low spots and fill with the vinyl patch youíll be good to go.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default drain

    Plug the hole with concrete, and then use a "self leveling" floor underlaymet material to level the floor.

  4. #4
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    Armstrong makes the self-leveling underlayment material HJ speaks of and it works quite well and is cheap. Mix it in a 5 gallon bucket, pour it on, and leave it alone. In a few minutes it will have spread itself smooth and level over the floor. I use a long shaft paint mixer in a 3/8" drill to mix it.


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