To find the high spots use a straightedge on the floor and mark where it
hits. Another method uses old fashioned carbon paper, carbon side down on
the floor and lower the toilet and twist and jiggle it to leave marks on the
high spots. It will take several attempts to find all the high spots. Also
one can cover the entire toilet bottom with tape and lay some thinset mortar
on the floor. Press the toilet into the thinset, and clean up what squeezes
out. Let it set overnight before moving the toilet. Then do the final
install with the seal and bolts. The tape will prevent the thinset from
bonding the toilet permanently to the floor.


"Phisherman" wrote in message
...
I'm installing a new toilet on a basement floor. I lined up the
flange slots with the bowl holes and traced around the perimeter of
the toilet. When dry-fitted It slightly rocks on the concrete floor.
I can remove small amounts of the concrete with a Dremmel tool. Is
there an easier way than trial-and-error to determine the high points?
How is this usually done? I'm guessing that this rocking has to be
eliminated before I can proceed with the install? TIA