Flange & subfloor question

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tc1

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So, I'm rebuilding my bathroom from the floor up.
The toilet flange and elbow are black abs and have been either been cemented or leaded into cast iron.
I'm ready to install the new subfloor, but the top of the subfloor will be flush with the top of flange.
I have no desire to tear into the abs/cast iron union and start over, but i need to raise the flange height by about 3/4".

Any suggestions?
 

Smooky

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You could double the wax ring or use some type of toilet flange extension kit.

 
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tc1

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that takes care of the elevation issue. but i still need to raise the flange enough to slide the new subfloor under it, don't i?
 

Jadnashua

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The edges of the flange do need to be supported. Ideally, it would sit on top of the finished floor, and be anchored through it into the subflooring. If it's sitting on subflooring now, usually, you can get some new underneath, but that also means that you may need to put in some blocking to support it on the cut seam, especially if you're intending to tile the floor, or it will be weak there, and potentially crack your tile or grout.
 

tc1

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making a long story short, after chiseling off two layers of tile, a few inches of concrete, plus 6 inches of fill material i leveled the floors.
and now the flange is sitting at the same elevation as the subfloor.

i've seen a few videos of people drilling, cutting, and then prying and abs flange off the elbow. is that my only option?
or do i just cut the abs ring off, leave the collar glued where it is, then find a new flange that will slip inside of the original?
 

Jadnashua

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A cleaner way to remove pipe from a socket is to buy a tool made for it to ream the socket out. One brand is called RamBit. Trying to crack it out is prone to problems...you might get it without too much damage, but then again, you may not. The tool should always work.

But, depending on how thick your added components are, you may just need two wax rings or one jumbo. Or, some of the waxless seals create their seal via a funnel and gasket on the inside of the pipe and can overcome a flange that is lower than design.
 

Jadnashua

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A cleaner way to remove pipe from a socket is to buy a tool made for it to ream the socket out. One brand is called RamBit. Trying to crack it out is prone to problems...you might get it without too much damage, but then again, you may not. The tool should always work.

But, depending on how thick your added components are, you may just need two wax rings or one jumbo. Or, some of the waxless seals create their seal via a funnel and gasket on the inside of the pipe and can overcome a flange that is lower than design.
 
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