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Old 06-16-2013, 11:13 PM   #1
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How deep should my toilet 3" drain pipe be?


I'm relocating my toilet in the bathroom and need to figure out the best height for the toilet drain pipe BEFORE I lay the sub floor.

My bathroom will have a subfloor, cement board and then tile. Should my toilet line be flush with the tile or below a little?

I want to make sure I have the best height so when I put my flange down onto my finish floor, the flange will reach the drain pipe. If the drain pipe is too high, I won't be able to sit the flange flush with the finished floor.

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Old 06-16-2013, 11:39 PM   #2
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How deep should my toilet 3" drain pipe be?


Determine what elevation you want the flange- either on top the tile or flush with it- I prefer on top of the floor.
Then calculate the take off for the flange and cut the pipe accordingly.
Or you can leave a little high and use an inside cutter when you set the flange.

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Old 06-16-2013, 11:46 PM   #3
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How deep should my toilet 3" drain pipe be?


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Originally Posted by TheEplumber View Post
Determine what elevation you want the flange- either on top the tile or flush with it- I prefer on top of the floor.
Then calculate the take off for the flange and cut the pipe accordingly.
Or you can leave a little high and use an inside cutter when you set the flange.
What's an inside cutter?

Also, the flange is an ABS style flange that goes over the 3" drain pipe. Not sure how to calculate the cutoff since everytime I pre-fit the flange on the pipe, the flange doesn't seat the same depth since the pipes can be 'sticky.'

I figured with this type of flange, if the drain pipe is about an inch below the finish floor, the flange lip should be able to grab it with about a 1.5" bite.
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Old 06-17-2013, 08:12 AM   #4
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How deep should my toilet 3" drain pipe be?


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What's an inside cutter?

Also, the flange is an ABS style flange that goes over the 3" drain pipe. Not sure how to calculate the cutoff since everytime I pre-fit the flange on the pipe, the flange doesn't seat the same depth since the pipes can be 'sticky.'

I figured with this type of flange, if the drain pipe is about an inch below the finish floor, the flange lip should be able to grab it with about a 1.5" bite.
Inside cutter- http://www.lowes.com/pd_285724-943-3...ductId=3234579
If you use this cutter, put a rag in the pipe. If the bit falls out of the chuck you won't loose it down the pipe- that's experience talking

Once you apply glue the fitting will seat completely onto the pipe.
If you measure from the top of the flange to the interior pipe stop, then add maybe a quarter inch for giggles- you should be good.
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Old 06-17-2013, 08:41 AM   #5
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How deep should my toilet 3" drain pipe be?


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Old 06-17-2013, 09:57 AM   #6
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How deep should my toilet 3" drain pipe be?


Why don't you set it before the finished floor goes down? Put shims under it to hold it up and screw it down.
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Old 06-17-2013, 09:59 AM   #7
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How deep should my toilet 3" drain pipe be?


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Why don't you set it before the finished floor goes down? Put shims under it to hold it up and screw it down.
I'm not following you. Shims?

I've exposed the plumbing by tearing up the floors. I'm set to cut the finished pipe before laying down my subfloor on top of it. Want to make sure I cut it right before the floor goes down.
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Old 06-17-2013, 12:24 PM   #8
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How deep should my toilet 3" drain pipe be?


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Originally Posted by Alan View Post
Why don't you set it before the finished floor goes down? Put shims under it to hold it up and screw it down.
I'm not following you. Shims?

I've exposed the plumbing by tearing up the floors. I'm set to cut the finished pipe before laying down my subfloor on top of it. Want to make sure I cut it right before the floor goes down.
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Old 06-17-2013, 12:30 PM   #9
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How deep should my toilet 3" drain pipe be?


Leave the pipe sticking up above the sub floor and cut it off after the finished floor is set using the inside cutter above.
the would be after the sub floor is installed. He is saying use shims the thickness of your new flooring ans set the flange now. Then the flange will be even with the new floor.
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Old 06-17-2013, 01:11 PM   #10
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How deep should my toilet 3" drain pipe be?


I believe you are overthinking this. I'm not a pro and have only plumbed a handful of houses, but I have always put down the subfloor first, then the flange, then the rest of the piping. Depending on what the finished floor is, a flange extender as needed.

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