How to Replace a Toilet Wax Ring
The 90-minute fix that prevents thousands of dollars in subfloor damage.
TL;DR
Wax ring replacement is the same procedure as installing a new toilet — pull the old toilet, install new wax ring + closet bolts, set the toilet back. Common reasons to replace: leak at base, toilet rocked for too long, toilet replacement, or routine after pulling toilet for any reason.
What’s in this guide
- When to replace
- Tools and materials
- Pull the toilet
- Install new wax ring
- Reset and test
The wax ring is the only thing between your toilet drain and your subfloor. When it fails, water seeps continuously into the floor, rotting subfloor and joists over months. Replacement is straightforward and costs $10 in materials.
Tools & Materials You’ll Need
Tools
- Adjustable wrench
- Putty knife
- Sponge
- Bucket
Materials
- New wax ring with horn ($6)
- New closet bolts ($4)
- New toilet shims if floor is uneven ($3)
Step-by-Step Instructions
Shut Off Water and Empty Tank
Close shutoff valve. Flush. Sponge remaining water from tank and bowl. Disconnect supply line.
Remove Old Toilet
Remove decorative caps, loosen closet bolt nuts, lift toilet straight up. Set on cardboard. The old wax will stick to both the toilet and the flange.
Scrape Off Old Wax
Use putty knife to scrape wax off the toilet bottom AND the floor flange. Both surfaces should be clean. Stuff a rag into the drain pipe to block sewer gas during the rest of the job.
Inspect the Closet Flange
The closet flange (round ring on floor) should be flat, intact, and slightly above the finished floor. Cracked flanges need repair before installation. If flange is below floor level, use a flange spacer ring.
Set New Closet Bolts and Wax Ring
Insert new closet bolts into the flange slots. Press the new wax ring onto the bottom of the toilet (NOT the flange) — wax-side will face down when toilet is set. Use a wax ring with a plastic horn (the funnel) for cleaner installation.
Set Toilet on Flange
Lift toilet, align bolts with the holes in the toilet base, lower straight down. DON’T rock or tilt — once set, leave it. Press down with body weight briefly to seat the wax ring.
Tighten Bolts (Carefully)
Hand-tighten nuts on closet bolts. Then snug with a wrench, alternating sides. STOP when the toilet feels solid — over-tightening cracks porcelain.
Reconnect and Test
Reconnect supply line. Slowly open shutoff. Flush 3 times and watch the toilet base for any water. Leave a paper towel at the base for 24 hours and check.
After thousands of toilet jobs, the failure mode we see most is people reusing the original wax ring. The wax compresses permanently the first time it’s set; a “reused” ring leaves an imperfect seal that leaks slowly. New wax ring + new closet bolts every time. Total: $10. Worth it.
Don’t reuse old closet bolts
They’re corroded after years in a wet environment. They snap during tightening, leaving the toilet unsecured.
Real Scenarios from Our LA Service Calls
Slow leak detected by ceiling stain below
Homeowner’s downstairs neighbor (1962 duplex) reported a growing dark spot on their kitchen ceiling. Investigation revealed a slow wax-ring leak from upstairs toilet. Replaced the wax ring + closet bolts ($10), patched the ceiling. Caught early enough that subfloor damage was minimal.
When to Call a Plumber Instead
DIY isn’t always the right call. Bring in a licensed plumber if any of these apply:
- Closet flange is cracked or damaged
- Subfloor under toilet feels soft (rot)
- You don’t have access to main shutoff
- Toilet is unusually heavy or fragile (commercial wall-hung style)
Frequently Asked Questions
How long does a wax ring last?
25+ years if toilet doesn’t move. Forever, technically. The wax doesn’t wear out — it fails when the toilet shifts.
Wax ring vs rubber seal — which?
Wax: traditional, seals well, doesn’t need to be re-set if disturbed. Rubber: re-usable, easier to install, slightly less forgiving of misalignment. Both work; wax is more common.
Should I use plumber’s putty around the base?
No — plumbers traditionally don’t. Adding silicone all the way around hides slow leaks. Leave a 6-inch gap at the back to spot leaks early.
Can I replace the wax ring without taking the toilet off?
No. Must lift toilet to access.
Is foam ring just as good?
Foam (like Sani Seal) is becoming popular. Re-usable, mess-free. Slightly less forgiving of imperfect alignment. Either works.
Need professional help in Los Angeles?
Same-day service. Flat-fee pricing. No surprise add-ons.
Call (818) 938-8660
