Toilet supply lines and fill valves fail in the middle of the night more often than any other fixture, mostly because that is when the pressure on a municipal system is highest. A toilet fill valve stuck open will run continuously, and the overflow tube delivers it to the floor instead of the bowl.
What the ceiling is telling you
- A single round stain over the fixture below usually means a localized leak, often the wax ring or the toilet base seal.
- A spreading irregular map means water is travelling along the subfloor and finding multiple low points.
- Bubbling paint with a sag means the ceiling material is saturated and needs to come down.
- Water at a light fixture or a smoke detector is an electrical emergency; kill the circuit first.
Why old Tacoma homes make it worse
Plaster over lath absorbs far more water than drywall before it looks wet, so in a North End four-square the ceiling can hold a substantial volume and then fail suddenly. On the plus side, lath-and-plaster ceilings can often be dried and repaired rather than replaced, which preserves the original texture.
What the ceiling pattern is telling you
A ceiling stain from an upstairs bathroom is a map. A tight brown ring with a wet centre means the water is arriving at one point, which is usually a wax ring or a supply connection directly above it. A long, sagging line along a joint means water has spread across the ceiling board and is pooling at the tape. A wide grey area with no clear centre typically means the water came from a failed tile shower pan and has been migrating for weeks.
The pattern also tells you whether you are looking at clean water or category 2. Water that came through a toilet bowl or a drain line is contaminated and changes what has to be removed. Water from a supply line is clean and the ceiling can often be dried and kept.
Reading it in the first ten minutes
- Stop the source: shut the toilet supply, and if the bowl is overflowing, shut the valve and stop flushing.
- Get a bucket and a large towel under the stain before it lets go, then photograph the ceiling as it is.
- Do not press on a bulge. Note where it is, then clear the floor beneath it.
- Mark the extent with a pencil so the growth of the stain is measurable an hour later.
- Leave the ceiling intact until a meter reads it. The board is the best moisture map you have.
Why older Tacoma homes make it worse
Pre-war homes in Tacoma often have rock lath and plaster ceilings, which hold water longer than drywall and are heavier when saturated. Plaster also hides the leak until it is advanced, because the brown coat is dense and the stain shows late. On the other side, a plaster ceiling that is dried in time is more durable than drywall and worth saving.
Does the toilet have to come up?
If the wax ring failed, yes, and the flange gets inspected at the same time. A toilet reset on a failed flange leaks again within a season. We dry the subfloor under it, then the plumber resets with a new ring and, if needed, a flange repair kit.
What the ceiling repair looks like after it dries
Once the assembly reads dry, the ceiling repair splits into two paths. A drywall ceiling that took clean water and did not sag can be sealed, skimmed and repainted, and the repair disappears. A ceiling that sagged, delaminated or took contaminated water comes out in the affected area plus a margin, gets new board, tape, texture and paint, and the texture match is the part that decides whether you can see it.
A plaster ceiling is a different trade. Plaster is patched with a base coat and a finish coat, then matched to the surrounding surface by a plasterer, and a good repair is invisible under raking light while a drywall patch in a plaster room is obvious the moment the sun comes in low. On a pre-war Tacoma house, that difference is worth paying for.
Ceiling and bathroom water losses across Tacoma: 425 390 5911.
- Water damage
- Tacoma
- Plumbing
- Plaster
