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Does the base of your toilet look like it had an "accident"? It may need a new seal between the bowl and the drain.
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Shut off the water supply to the toilet at the supply-line valve beside the toilet or at the main water source. (If you don’t have a shutoff valve, see shut-off valve installation story for tips on how to install one.) Then flush and sponge the water from the tank until it’s dry. Use a plunger to force most of the remaining water in the bowl down the drain and sponge out the rest.
A wet /dry shop vacuum empties toilet tanks and bowls in an instant. Check the manufacturer’s instructions for how to set it up to suction water.
Detach the water supply-line hose from the toilet tank and catch any water in the line using a bucket or towels. Loosen and remove the nuts holding the toilet to the floor.
If the bolts have corroded, first apply penetrating oil and allow it to seep over the threads for a few minutes before loosening the bolts. Apply only moderate pressure to loosen the bolts. Anything more may bend or break the toilet anchor flange.
If you’re working in an awkward space or the toilet appears too heavy to lift, consider removing the bolts attaching the tank to the bowl and moving the two parts separately. Before lifting the toilet, place four 2 x 4 x 6 blocks on edge on the floor to hold the toilet drain off the floor. Choose a corner of the bathroom away from the drain to give yourself room to work. Angle the blocks slightly so they won’t tilt as you rest the toilet on them. Carefully lift the toilet while keeping the base parallel to the floor. Check the drain to make sure the old wax ring isn’t still attached. Set the toilet on the blocks.
It’s hard to empty everything from the drain trap that loops from the bowl to the floor drain opening. That’s fine as long as the toilet base remains parallel to the floor, but tilting it back and forth can spill water from the trap all over your floor.
Wear a pair of disposable gloves to remove and discard the old wax ring. (It’s extremely sticky and, let’s face it, was under your toilet for years.) Provide plenty of ventilation and use a plastic putty knife, followed by a rag soaked in mineral spirits, to clean any remaining wax from around the toilet anchor flange and the drain on the bottom of the toilet (if you’re reinstalling it). Remove the old mounting bolts and check the toilet anchor flange for damage.
After you remove the old wax ring, immediately plug the drain with a ball of rags or an old towel large enough that it doesn’t fall into the pipe. An unplugged drain can allow noxious sewer gas to enter your home.
Remove the old bolts from the toilet anchor flange and check the flange for cracks or missing pieces. Install any repair parts or spacers as needed before inserting the new toilet mounting bolts.
You wouldn’t think something as heavy as a toilet could fall over, but it can if not anchored down. A broken flange means a useless anchor bolt, so install a flange repair kit if you notice leaks or wobbles.
Again wearing a pair of disposable gloves, press the new wax ring into place around the raised ring at the bottom of the toilet drain on the underside. Seat it firmly enough to hold it in place, but don’t press it out of shape.
Lift the toilet with the bowl drain directly over the floor drain and lower it in place with the mounting screws coming up through the holes in the base. Press gently and rock it slightly to help the wax ring form a tight seal.
With the toilet base firmly against the floor, attach the washers and nuts holding the toilet in place. Tighten them enough to keep the toilet from rocking -- even just a bit. Then add the decorative caps.
Stop tightening the nuts holding the toilet to the floor as soon as they’re snugly in place and keep the toilet from tipping. Too much torque can crack the porcelain or damage the drain flange.
Apply fresh thread tape to the tank inlet threads and attach the water-supply line to complete the project. As a precaution, check the base of the toilet for leaks an hour after flushing it and again the next day to make sure the ring formed a waterproof seal around the drain.
For insurance against leaks, replace the water line linking your toilet to the water line coming through the wall or floor.