You Found a Water Stain. Now What?

Justin Matthews • September 3, 2026

The stain is the symptom, not the leak

The stain is the symptom. Painting it is treating the symptom.

Find out whether it is active first. Mark the edge of the stain with a pencil and check it after the next hard rain. If it has grown, it is live.

Location narrows the cause. Below a bathroom is usually a supply line, a wax ring or a shower pan. Below an exterior wall is usually flashing or a window. Along a ceiling edge is usually the roof or a gutter backing up.

Touch it. A soft ceiling means the drywall has lost integrity and needs replacing, not sealing.

Never paint a stain with regular primer. Water stains bleed straight through latex. They need a dedicated stain-blocking primer, and even then only after the source is fixed.

The sequence that works: stop the water, let it dry fully, replace anything soft, block the stain, then paint. Skipping the drying step is why stains come back.

When it needs more than us: if there is active mould beyond a small area, or the framing is wet, that wants a remediation specialist before any repair.

Send a photo of the stain and tell us what is above it. We will tell you where to start.

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