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Flange height

bluedog225

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Jan 31, 2012
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3,241
Location
Texas
IMG_2147.jpegI’m just about to glue in my toilet flange. I’ve heard the instruction to put it above the finished floor height.

I was thinking of putting it an additional 1/8 above the finish floor height to account for the flooring adhesive and whatever.

Is this the right move? I’ve already had to cut this thing out and do it over once so I’d like to get it right.

Many thanks
 
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larry4406

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Jan 27, 2006
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19,033
Location
Northern Virginia
Yes the underside of the flange is the top surface of the finished flooring.

OP has an offset flange, so might be advantageous to glue now.

Where possible, I like using a 3x4 reducing elbow at the toilet and stubbing up with 4" and a cap. Then run flooring tight to the pipe. Use oscillating saw tool to cut pipe flush with finished floor, debur pipe, insert and glue your toilet flange, then run screws.
 
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bluedog225

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Jan 31, 2012
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3,241
Location
Texas
I’m glued all the way up to the 4 inch pipe that I will drop the offset flange inside of.

I’m realistically a couple of years from finishing out this place. Out in the country. No other facilities available except for a shovel and the woods.

Not having facilities is getting a little old.

It may not be obvious from the photo above, but those yard sticks are sitting on pieces of what is going to be to finish floor.

Given that the offset flange is an inside fitting, I guess I could just stick it in there without glue and later glue it up when I put the finished floor in. It’s sitting on top of a 12 foot 4” waste pipe so I doubt there will be an issue.

Or maybe a little light flexible sealant to hold it in place.

I can see the advantage of being able to take the toilet back out when I’m putting in the finished floor.
 

Fav Onefour

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Jul 14, 2022
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689
Location
MN cold and hot
I make a round flange sized piece out of the new flooring material and tuck it under the flange when I set it in place.
This is a bad pic but hopefully it helps with the concept.
2270 bath toilet flange.jpg
I use other scraps of flooring around the flange so I can set the toilet temporarily. During construction, I use a rubber seal kit under the toilet. It's easy to simply pull the toilet and set it back in place with those seals. I bet the toilet used on that flange in the picture was pulled at least four times. It was the only bath in the project and my wife was helping. No way I could go for days without a toilet.
 

larry4406

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Jan 27, 2006
Messages
19,033
Location
Northern Virginia
At the day job, we use CPVC supply piping.

The plumbers cut short lengths of piping equal to the flooring allowance (typically 1/2 - 3/4" inch depending on what the customer selected).

These cut pipe pieces are then placed vertically under the flange to act as a spacer.

The CPVC spacers are placed concentric with the flange screw holes, then the screws run thru them to hold the flange secure and at the proper raised height for flooring.

Actual flooring for the home doesn't arrive till around 1.5-2 months after the plumbing rough, so no actual pieces of flooring are available to use as a spacer.

1731846346151.jpeg1731846365860.jpeg
 

nmk_61802

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Mar 6, 2008
Messages
965
Location
Central IL
Gluing after the floor is really the best way.... but if you want to install now, a little low is better than high. Spacers are available to bring the flange up into the toilet shoe if needed.
 
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