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Bath & Faucets

Installing Toilet Flange in Basement Bathroom

Here's my situation:

I opened (jackhammered) the foundation floor of my basement to rebuild/reconfigure my basement.  I have moved the drain pipes (ABS now attached to the original cast iron) and now need to figure out:

  1. What type of cement I will use to close up the foundation?
  2. I will be tiling ther floor so how to handle installing the offset ABS toilet flange?  Flush with floor, on top of floor? How to attach it to the floor/concrete, etc.
  3. What else do I need to be thinking about?

Thanks for all your help!


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Posted 2013-05-17T02:17:31+0000  by MisterMagoo MisterMagoo

The flange should sit on the finished floor.  Too low and you'll need to use a thicker wax ring which can increase the chance of a leak, too high and the toilet will wobble.  Measure carefully and make sure you include the thickness of your thinset.


Just use ordinary concrete, which you can buy in bags.  Remember that while extra water will make the concrete easier to work with, it will decrease the strength of the mix and increase the chances of cracking.


Since you'll be filling with concrete it's probably not necessary to screw down the flange.  If you want to, use plastic anchors and stainless screws or masonry screw (e.g., Tapcons).



Posted 2013-05-17T13:31:02+0000  by Adam444

The flange I have fits inside the 3" ABS pipe coming up.  Should I check the height and then glue it together before I install the tile floor?


Is there any way I can avoid having to drill through the tile floor to secure the flange?



Posted 2013-05-17T13:41:41+0000  by MisterMagoo

If you have a stub coming up, then I'd just leave that.  Once you have your floor down cut off the stub and drop on your flange. Since the stub will be in concrete, you probably don't have to screw down the flange.  You just don't want it to move.


Remember too, there's a waiting time before you can set tile over fresh concrete.  Of hand, I don't know what it is but you don't want your tiles to pop.

Posted 2013-05-17T14:20:46+0000  by Adam444

The toilet flange is supposed to rest on top of the 'finished' floor...That way all you will need is a standard wax ring to make a water and gas-tight seal. If you are going to add a ceramic tile and an underlayment then you will need to raise the flange above the sub-floor by 3/4"...You can find a product (spacers) on Amazon called Set-Rite or at their website and watch the YouTube video they have there that will explain everything you ever wanted to know about toilet flanges but were afraid to ask!!



Posted 2013-05-18T04:58:29+0000  by how2do
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