Toilet flange on grout?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Go_Habs_Go, Mar 17, 2021.

  1. Go_Habs_Go

    Go_Habs_Go New Member

    Joined:
    Dec 5, 2020
    Location:
    Montreal, Canada
    Hi all,

    I'm in the middle of a full bathroom reno and just had the bathroom tiled. The tiler left a bit of a gap around the toilet drain (see photos) because he thought the plumber would install the flange directly to the sub-floor as opposed to on top of the tile. I explained that the plumber wanted to install the flange over the tile so the toilet would have a better seal with the flange.

    So the tiler ended up filing the gap with grout to make it flush with the tile around it. Can the flange sit on top of this? Will the grout support the flange?? Or should I remove the grout and then fill the gap with mortar or something more solid?

    flange 1.jpg flange 2.jpg flange 3.jpg
     
  2. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Your pictures are not that informative. Doesn't show the pipe. Doesn't identify the pipe diameter. Doesn't tell how high the pipe sits. Did you put a lid or a small pie over the pipe for the photo?

    If the outside of the pipe is covered in grout, then some kind of inside flange could be used. 3 inch or 4 inch?

    Closet flange over grout is fine; you can screw into that. Having space left around the pipe for an outside flange would have been better probably.
     
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  4. Go_Habs_Go

    Go_Habs_Go New Member

    Joined:
    Dec 5, 2020
    Location:
    Montreal, Canada
    Thanks for the reply, here are some additional photos. The drain is a lead toilet sleeve that is still closed at the top. Drain is 4" across and about 1.75" above the tile. The plumber said he would come back once the floor was tiled to cut the top of the pipe and install the flange. Agree that it would be better to install the flange over the tile but not sure if the tile is close enough to the drain pipe to be able to do that now.

    flange 4.jpg flange 5.jpg flange 6.jpg
     
  5. Jeff H Young

    Jeff H Young In the Trades

    Joined:
    Feb 27, 2020
    Location:
    92346
    the plumber will set a flange and w/c no prob.
     
  6. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
  7. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Joined:
    Sep 2, 2004
    Occupation:
    Retired Systems engineer for defense industry.
    Location:
    New England
    While grout isn’t quite as strong as say concrete, it’s probably stronger than plain cement based thin set...it’s strong enough by far in compressive strength for anything you’d want to do around a toilet. Now, depending on the tile, the plumber may need a diamond bit to efficiently drill holes to anchor the new flange, but is something he normally would be prepared for. And, yes, the correct place for the flange is on top of the finished floor, but numerous times, because the contractor doesn’t want to call the plumber back after the floor is finished, it gets mounted on the sub flooring. It can work, but may require a thick wax ring or a stack to seal, and the thicker the wax, if you get aggressive about plunging, should it become necessary at some point, it’s easier to blow out the wax seal.
     
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