Had a plumber replace a toilet last year. Ever since , toilet rocks from sie to side. I have tried using toilet shims, but still same problem. Have already tightened the flange bolts several times. They keep comming loose. Whats the deal? How do fix this ?

 

Once a toilet starts rocking, the wax seal is most likely broken. Tightening the bolts won't usually reseal it. You need to disconnect, drain and pull the toilet. Clean off the old wax, install a new wax ring and reseal it. Check to make sure that the toilet flange is not rusting apart and that it is securely screwed to the floor. Check that the plywood subfloor is not rotting. The toilet flange should be sitting on the floor. If it is higher than the floor, the toilet will rock. If it is flush (sitting on the floor) do not use a wax ring "with horn". It can squeeze all of the wax out and not seal. If it is below the finished floor, use a wax ring with a horn.

 

Thanks for the info. If flange is higher than floor ,what can i do to bring it to floor level?

 

That depends upon how high it is, what the pipe material is, whether the underside of the floor is accessible, etc.?
is the flange screwed to the floor now?
Sometimes, there is enough run and give in the pipe that it will push down a little bit. You might be able to shorten the pipe. If you are handy with wood, you could take some wood or plastic and make a shim under the entire perimeter of the toilet, but you would also have to make something to support under the toilet flange and allow it to be screwed to the floor.
Pull the toilet and then we can figure that out.

 

Hi again. i pulled out old toilet. Flange lip sits approx 1/2 inch above floor level. will this be a problem when i install new toilet?

 

If you mean that the bottom of the flange sits above the floor by ½", then yes it is a problem.
What is the pipe made of?
How accessible is the underside of the floor?

 

Yes it is. I don't know what your piping is so I can't come up with a solution. Sorry.

 

Piping is Cast iron.

 

You didn't answer if the underside of the floor is accessible.
I am going to suggest that you make or have made what I might call a "plinth" block. i would suggest some 1/2" plastic trim stock or 1/2" pine or similar. Set the base of the toilet on it and scribe the outline of the toilet. Scribe another line about 1½" inside of that line and cut outside the lines. Sand them down, prime and paint with a gloss or semigloss paint that will go with the porcelain of the toilet. Then you could use some clear silicone or hot melt glue to adhere that plinth to the base of the toilet. Then set the toilet as usual, using a regular wax ring. The toilet bolts should be long enough. Snug the bolts down enough so that the toilet won't move around, but don't over torque the nuts. Check them again in a week or so that they are still tight.
This is similar to the Toilevator, which adds 3½" to a toilet (check this web page): http://www.allegromedical.com/home/m...ator&ovtac=PPC