What’s Under Your Toilet? The Wax Ring
A failed toilet wax ring can rot your bathroom subfloor. Learn the warning signs and how The Great House repairs it in Northern Virginia.
BATHROOM REMODELING
10/27/20263 min read
ASK MASON · BATHROOM
What’s Under Your Toilet? The $5 Wax Ring That Can Rot Your Floor
Mason shows how the wax ring seals your toilet, the signs it has failed, and how we fix it.
A five-dollar part under your toilet can ruin your whole bathroom floor.
Watch Mason’s video, then read how the wax ring works, the signs it has failed, and how we fix it.
IN THIS GUIDE
01
What Mason Checks
The Wax Ring That Seals Your Toilet
WAX RING
A soft ring of wax between the toilet and the drain.
FLANGE AND BOLTS
Hold the toilet down tight on the ring.
WATERPROOF SEAL
Every flush goes straight down the drain.
Under every toilet sits a wax ring, pressed between the bottom of the toilet and the drain pipe.
The toilet is bolted down on top of it, and the wax squeezes into a tight, waterproof seal. Every time you flush, the water goes straight down the drain.
Wax rings don’t last forever. If the toilet rocks, even a little, or the floor shifts, the seal breaks.
Mason’s diagram: the wax ring, flange and bolts under a toilet
A rocking toilet is a broken seal waiting to leak.
02
Warning Signs
Signs Your Toilet Seal Has Failed
TOILET ROCKS
It moves when you sit on it.
STAIN AT THE BASE
Discoloration around the base of the toilet.
SOFT FLOOR
A spongy floor near the toilet.
Every flush pushes a little water out under the toilet. You won’t see it, because it soaks straight down into the subfloor.
Month after month, the wood stays wet, turns dark, gets soft and rots. The damage can reach the joists, and even the ceiling below.
Check this today
Sit on the toilet and shift your weight. Any rocking is a warning. Then press on the floor around the base and look for stains on the ceiling below.
03
How We Fix It
A Quick Repair Now, or a New Floor Later
We pull the toilet and open up the floor. We cut out the rotted wood, put in new plywood, install a new flange and wax ring, and bolt the toilet down level so it can’t rock.
Caught early vs. caught late
Caught early, it’s a quick, low-cost repair. Caught late, it’s a whole new bathroom floor.
In Northern Virginia
Many Northern Virginia homes are 40 to 60 years old. In Arlington, about 45% of homes were built before 1970 (U.S. Census, 2019–2023). In Fairfax County, a like-for-like toilet replacement doesn’t need a permit, but subfloor and framing repairs may. We fixed this on our Strause Ct renovation in Springfield.
Planning a bigger project?
Remodeling your bathroom? We replace the flange and check the subfloor under every toilet we set. See prices and real projects on our bathroom remodeling page.
The fix: new flange and wax ring, toilet set level
ASK MASON · BATHROOM
Want to know another problem?
SPOTTED ONE OF THESE SIGNS?
We’ll check it before it turns into a big repair
Free in-home visit from a Class A licensed team. We check the problem and the rest of your bathroom, then give you a clear written plan.
ABOUT THE AUTHOR
The Great House team
Written by the team at The Great House LLC, a Class A licensed builder and remodeler in McLean, VA (License #2705197237). We have renovated 30+ Northern Virginia homes since 2022.
PLANNING A PROJECT?
Our bathroom remodeling service
See prices, real photos and how we work: our bathroom remodeling page. Real projects: our project gallery.
Serving McLean, Vienna, Great Falls, Fairfax, all of Northern Virginia.