What a wax ring does and why it fails
A wax ring is a seal that sits between the bottom of your toilet and the flange — the metal or plastic ring bolted to your floor. It keeps water and waste from leaking into the subfloor and walls. The wax compresses when you bolt the toilet down, creating a watertight seal that lasts 20 to 30 years in most homes.
The ring fails when the wax hardens and shrinks, usually because of age, repeated temperature changes, or a toilet that rocks slightly on uneven flooring. You'll notice water pooling around the base of the toilet, a soft spot in the floor nearby, or a smell coming from under the toilet. Once the seal breaks, water damage spreads fast — replacing the ring now costs $150 to $300 in labor if you hire a plumber, but waiting can mean $1,000+ in subfloor repair.
This is a job you can do yourself if you're comfortable removing the toilet, working on the floor, and reinstalling it. It takes 2 to 3 hours the first time. If you're unsure about any step, call a plumber — a mistake here means water damage.
Key Takeaways
- You'll need to remove the toilet completely, so shut off the water supply and drain the tank first.
- Scrape off the old wax ring and inspect the flange for cracks or damage before installing a new one.
- A standard wax ring costs $5 to $15 and comes in two heights — measure your flange to get the right one.
- Press the new ring firmly onto the flange, then lower the toilet straight down and bolt it evenly to avoid rocking.
- Caulk around the base of the toilet after reinstalling it to catch any leaks you might have missed.
Shut off water and drain the tank
Turn the water shutoff valve clockwise — it's on the wall behind or to the side of the toilet. Turn it until the handle is perpendicular to the pipe. If the valve is stuck or missing, turn off the main water supply to the house instead.
Flush the toilet to empty the tank. If water doesn't drain, use a plunger or a wet/dry shop vacuum to remove standing water. Soak up any remaining water in the bowl with a sponge or towel and wring it into a bucket. You need the bowl dry before you disconnect the supply line.
Disconnect the supply line and remove the toilet
Locate the flexible hose or rigid pipe that runs from the shutoff valve to the bottom of the tank. Place a bucket underneath and loosen the nut where it connects to the shutoff valve using an adjustable wrench. Loosen the nut where it connects to the tank the same way. Remove the hose or pipe and set it aside.
Look at the base of the toilet on both sides. You'll see two bolts — one on each side — that go through the base and into the flange. These are called closet bolts. Pry off the plastic caps covering them (a flathead screwdriver works). Use an adjustable wrench or socket wrench to loosen the nuts underneath. Once both nuts are loose, rock the toilet gently side to side to break the old wax seal, then lift it straight up. It's heavy — ask someone to help or use your legs, not your back.
Set the toilet on its side on a towel or cardboard. Don't set it upside down on the rim, which can crack it.
Remove the old wax ring and inspect the flange
The old wax ring will still be stuck to the flange. Use a putty knife or old chisel to scrape it off. Work slowly — you're trying to remove the wax without damaging the flange underneath. Once the wax is gone, wipe the flange clean with a rag.
Look at the flange closely. It should be level with the floor or slightly above it. If it's cracked, broken, or sits below the floor level, you'll need a new flange before you install the new wax ring. A flange replacement is a bigger job — call a plumber if you see damage. If the flange looks solid and level, you're ready to install the new ring.
Choose and install the new wax ring
Wax rings come in two standard heights: standard (about 1 inch tall) and extra-thick (about 1.5 inches). Measure the height of your flange from the floor to the top. If it's level with the floor or slightly above, use a standard ring. If the flange sits noticeably below the floor — usually because of new flooring installed over old flooring — use an extra-thick ring. A standard ring costs $5 to $10; extra-thick rings cost $10 to $15. Both work the same way.
Remove the wax ring from its packaging and press it firmly onto the flange. Center it so it sits evenly all the way around. The wax should stick to the flange on its own. If you're working in a cold garage or basement, the wax may be stiff — warm it gently in your hands for a minute or two to make it more pliable.
Reinstall the toilet and reconnect the water
Lift the toilet upright and position it over the flange. The closet bolts should poke through the holes in the base of the toilet. Lower the toilet straight down onto the wax ring. Don't twist or rock it side to side — you want to compress the wax evenly. You should feel resistance as the wax compresses; stop when the base of the toilet sits flat on the floor.
Hand-tighten the nuts on both closet bolts, then use a wrench to tighten them in a crisscross pattern — tighten one side a quarter turn, then the other side a quarter turn, and repeat. Tighten until the toilet stops moving, then stop. Over-tightening can crack the porcelain. The toilet should not rock when you push on it.
Reconnect the water supply line by hand-tightening the nuts, then snug them with a wrench. Turn the shutoff valve counterclockwise to restore water. Let the tank fill, then flush once to check for leaks around the base and under the shutoff valve.
Caulk the base to catch slow leaks
Once the toilet is find and the water is running, explore a bead of silicone caulk around the entire base where the toilet meets the floor. Use a caulk gun and run a smooth, continuous line. Smooth it with a wet finger or caulk tool. This catches any water that might seep past the wax ring and directs it down the outside of the toilet instead of into the subfloor.
Let the caulk cure for 24 hours before you use the toilet heavily. Check under the toilet and around the shutoff valve for leaks over the next few days. If you see water pooling, turn off the water, remove the toilet, and inspect the wax ring — it may not have seated evenly.
When to call a plumber instead
Call a plumber if the flange is cracked, sits below floor level, or is corroded. Call if the closet bolts are stripped or missing and you can't tighten them. Call if you remove the toilet and find water damage or soft spots in the subfloor — that's a sign the leak has been going on for a while and the floor may need repair before you reinstall the toilet.
Call if you reinstall the toilet and water still leaks from the base after 24 hours. This usually means the wax ring didn't seat evenly, but it could also mean the flange is damaged in a way you didn't see, or the toilet itself is cracked. A plumber can diagnose the problem and fix it without you having to remove the toilet again.
Frequently Asked Questions
Can I reuse the old wax ring?
No. Once the wax is compressed and removed, it loses its seal. Reusing it will leak. Always install a new ring.
What if I can't get the old wax ring off the flange?
Heat it gently with a heat gun or hair dryer to soften the wax, then scrape. If it's still stuck, use a plastic scraper instead of metal to avoid gouging the flange. Take your time — rushing damages the flange and makes the new seal fail.
Do I need to caulk around the toilet base?
Yes. Caulk catches slow leaks and directs water away from the subfloor. Use silicone caulk, not acrylic — silicone resists moisture better. Leave a small gap at the back if your toilet is against a wall so you can see if water is leaking.
How do I know if the wax ring is seated evenly?
The toilet should sit flat and level on the floor without rocking. If it rocks, the wax didn't compress evenly. You'll need to remove it and try again. Check with a level across the rim of the toilet bowl.
What's the difference between a wax ring and a wax-free ring?
Wax-free rings use rubber or foam instead of wax. They're easier to install, reusable if you remove the toilet again, and work well in cold climates where wax hardens. They cost $15 to $25 but last just as long. Either type works — choose based on your comfort level and climate.