How to Repair a Broken Toilet Drain Pipe in Concrete

Written by kelly schuler
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How to Repair a Broken Toilet Drain Pipe in Concrete
Give your toilet a rock-solid foundation. (petticoat image by Susanne Güttler from

Rocking and rolling on your toilet can be a little unnerving. The hidden damage from water leaking under a loose toilet can cost thousands of dollars to fix. The sooner you can make the repair the better. Repairing a broken toilet drainpipe, even in concrete, is not that difficult for the novice do-it-yourselfer. The whole job will take about three hours, depending on how fast your concrete mixture dries.

Skill level:

Things you need

  • Towel
  • Hammer
  • Chisel
  • Insert closet repair flange
  • Small bag of concrete mix
  • Power drill
  • Concrete drill bit
  • Concrete anchors
  • Concrete anchor screws

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  1. 1

    Insert a large towel into the toilet drainpipe. This is to keep debris from falling into the sewer line. If you think the rag will fall down the pipe, tie a string around it first.

  2. 2

    Break off the rest of the old closet flange with a hammer and chisel. Be careful of flying pieces of metal or plastic.

  3. 3

    Pour concrete around the toilet drainpipe up to floor level if necessary. Smooth the concrete even with the bathroom floor. This will give the new flange a solid foundation to anchor.

  4. 4

    Remove the towel from the drain. Push the new repair closet flange into the drainpipe. Some closet repair flanges need tightening from the inside before you anchor them.

  5. 5

    Drill at least four anchor holes into the new concert through the anchor holes in the flange. Use a concrete drill bit to drill the holes, and then insert the anchors and screws.

Tips and warnings

  • Always anchor the toilet flange.
  • Wear safety glasses and rubber gloves when working on toilet flanges.

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