If you are a do it yourselfer, there are many adapters available to replace a broken cast-iron toilet flange. These adapters can be made of cast-iron itself or PVC. They are made to be inserted into the existing pipe where a rubber gasket is tightened to create a water tight seal. The adapter incorporates a new flange which is attached to the existing sub-floor. Other adapters even help in the case of damaged or rotten sub-floor around the waste pipe. If you do a search on "Repair Kit For Cast-Iron Closet Flange" you should come up with numerous options or you can visit your local pluming supply company who can provide you with both products and answers to any questions/concerns you might have. And if you don't feel comfortable doing this yourself after investigating what is involved, call a licensed plumber.
depending on your type of flange and pipe and the damage of the flange, if you have a PVC flange with just the bolt slots busted then you can screw in new bolts to the floor below the flange and still use the flange but if its broken where the wax seal sits then if your flange is lower then the floor you can use a insert flange that fits inside your old toilet flange with thin walls to keep the pipe size maximum. To replace the entire flange can be a job especially if its in concrete or in a floor joist because most of the time you have no room and if its cast iron pipe it can be even more of headache but in order to replace the flange you need to cut it out to where you can reconnect the pipe and flange by using a fernco or a no hub band. Sometimes it is impossible to replace because the flange can be on all close fittings and you pretty much have to replace most of the plumbing drain pipe to replace it properly which is why you want to try repairing your toilet flange rather then replacing it .
Depends on the type what means I use to replace it CAST Iron/ BRASS / Antimony / PVC / SCREWED TYPE
The best method for installing a toilet flange on a cast iron pipe is to use a wax ring and secure the flange with screws. Make sure the flange is level and properly aligned with the pipe before tightening the screws.
A cast iron toilet flange adapter is used to connect a toilet to a cast iron pipe. It serves the purpose of providing a secure and watertight connection between the toilet and the pipe. The adapter helps to ensure proper alignment and stability of the toilet on the cast iron pipe, preventing leaks and ensuring efficient waste removal.
You have to take the lead and packing out that is holding the flange in the next piece of pipe. If your flange is broke where the toilet bolts go, this is very common. There is a repair available for this. It consists of two curved pieces of metal that are about 1/3 of the circumference of the flange. They go under the flange and give you a new place to put the bolt. They are a lot easier to use than replacing the whole flange.
To effectively repair a cast iron toilet flange, you can use a repair kit specifically designed for cast iron flanges. First, clean the area around the flange and remove any old wax or debris. Then, follow the instructions on the repair kit to apply the adhesive or epoxy to the damaged area. Make sure to let it dry completely before reinstalling the toilet. This should help restore the integrity of the flange and prevent any leaks.
Toilet flanges OUTSIDE of the pipe including cast iron and brass to lead
A cast iron toilet flange in a plumbing system provides durability, stability, and resistance to corrosion. It can withstand heavy loads and is long-lasting, making it a reliable choice for securing toilets in place and preventing leaks.
Change how? Move the location, you bust out the concrete and move it. Replace or repair the flange that the toilet hooks to. Cut the existing flange off flush with the floor and install a new repair flange. They can be brass or steel. You can use a PVC one that fits in the drain and seal it with a wax ring under it and screw it to the floor. If you are working with cast iron flange and the slots where the bolts are supposed to go is broken out, they make a repair piece for this. It is a 3/4 inch wide by 3-4 inch long crescent shape piece that slides under the flange and the bolt that holds the toilet fits into it. You may have to chip out a little concrete along the edge to get these under the flange.
it can cost from as little as 100 to as much as 1000 depending who does it and what is actually wrong. if the flange is cast iron it will be more. if it is glued abs or pvc and the drain is broke thats gonna cost more than 200. you may not need to actually repalce the flange and you may be able to use a metal repair bracket. If the flange is unrepairable its a dirty job and if the flange is glued that means the drain has to get cut back and then coupled and extended. and remember plumbers dont fix walls. so any holes made wont be their resonsiblity to fix.
If you can get to the 6 inch cast iron, you could use a rubber coupler between the cast and the flange. If it is in the concrete, put a piece of 4 inch PVC inside the 6 inch and lead it in like you would a regular cast joint. Leave the 4 inch above the floor and slide the flange over it, screw it down and cut the 4 inch flush with the flange. They make just the flange that will slide over the pipe.
I removed the broken flange by perforating the lead filling between the drain pipe and the flange - i.e., drilling holes every 1/4-1/2 inch or so with a regular drill and then sawing through the filling with a power saber saw. Then pried the flange off with a pry bar. Wasn't as bad as I expected. - Dan