The wax ring is the seal between the bottom of the toilet and the drain flange in the floor. It is not a gasket under pressure — it just has to stay squashed and airtight. When it fails you get water seeping around the base, or a smell, or both.
The job itself is simple. What causes callbacks is the preparation and the resetting, so those get the most attention here.
Before You Start
Get the new ring first. You have two choices:
- Traditional wax. Cheap, proven, and completely unforgiving — once you set the toilet down you cannot lift it to check, because the wax will have deformed and must be replaced.
- Waxless (rubber or foam) seal. More expensive, repositionable, and far less messy. If this is your first time, this is the sympathetic option.
Also buy new closet bolts. The old ones will be corroded and are pennies. Our guide to the most effective seal for toilets compares the types in more detail.
Step 1: Shut Off, Drain, Disconnect
Close the shut-off valve. Flush and hold the handle to empty the tank, then sponge out the remaining water from both tank and bowl. The bowl trap will hold water no matter what — sponge as much as you can, because whatever is left will end up on your floor when you tilt the toilet.
Disconnect the supply line.
Step 2: Lift the Toilet
Prise off the bolt caps and undo the nuts on the closet bolts. Corroded nuts may need penetrating oil, or cutting with a hacksaw blade.
Rock the toilet gently side to side to break the seal, then lift straight up. Two-piece toilets can be split first — remove the tank and lift the bowl separately — which makes this much more manageable. A one-piece toilet is a two-person lift.
Set it on old towels or cardboard, on its side. Have a plastic bag ready for the old wax.
Step 3: Scrape Everything Off — Properly
This is the step that determines whether the new seal holds. Scrape all the old wax off both the flange in the floor and the horn on the underside of the toilet. A putty knife and patience. It needs to be genuinely clean, not mostly clean — old wax left in place stops the new ring compressing evenly.
Stuff a rag into the open drain while you work, to block sewer gas and to catch anything you drop. Take it out before you reset the toilet. People forget.
Step 4: Inspect the Flange
With everything clean, look hard at the flange. This is the moment to find problems, because you will not be back here for years.
- Cracked or broken flange? Fit a repair ring before going further.
- Flange below floor level? Common after new flooring is laid over old. A standard ring may not seal — use an extender or a thicker seal.
- Soft or spongy floor around it? Stop. That is water damage from a long-running leak, and setting a new toilet on a rotten subfloor will not hold. This is the point to get someone in — see toilet installation cost.
Step 5: Set the New Seal
Fit the new closet bolts into the flange slots and turn them upright. Place the ring — most people fit it to the flange, though fitting it to the toilet horn works too and can make alignment easier.
Now the part that matters: lower the toilet straight down onto the bolts in one movement. Do not slide it, do not twist it to line things up, and do not lift it back off to check. Any of those deform the wax and break the seal. Line the bolts up before you commit.
Once it is down, press firmly and evenly with your weight to compress the seal.
Step 6: Bolt Down Gently
Hand-tighten the nuts, then alternate sides in small increments. Stop when the toilet no longer rocks. It should not be cranked down — ceramic cracks under point loading, and the seal does not need force.
Trim the bolts and fit the caps.
Step 7: Reconnect and Watch
Reconnect the supply, open the valve slowly, let it fill, and flush several times. Check around the base with dry paper after each flush and again an hour later.
If you see seepage, it will not cure itself — the seal has to come up and be redone with a fresh ring. That is the one genuinely annoying thing about wax, and the reason waxless seals have become popular.
If the leak persists after a correct reset, the cause may not have been the ring at all — see toilet leaking at the base for the other possibilities.
