A brown stain on the ceiling or a drip after a heavy rain usually means one thing: water is getting through your roof somewhere. Finding exactly where can be tricky, because water rarely comes in right above the spot where you see it. Here’s how to narrow it down.
Signs you have a roof leak
- Brown or yellow stains on ceilings or high on walls
- Peeling or bubbling paint near the ceiling
- Damp or flattened insulation in the attic
- Dark spots, mold or a musty smell in the attic
- Drips or puddles after heavy rain
- Shingles, flashing or pieces of roofing in the yard after a storm
Why the leak isn’t always above the stain
Water that gets under your shingles runs downhill along the roof deck, rafters and the top of your ceiling before it finds a place to drip. The actual opening is usually higher up the roof slope than the stain, and sometimes several feet away.
Check your attic first
If you have an attic you can get into safely, take a strong flashlight and look at the underside of the roof above and uphill from the stain. Step only on the joists, never between them, or you can go through the ceiling. Look for:
- Water stains or dark streaks on the wood
- Damp or discolored insulation
- Daylight coming through where it shouldn’t
- Rusty nails, which can mean moisture over time
The best time to look is during or right after a rain, when the water trail is easiest to follow.
The most common places roofs leak
- Flashing around chimneys, skylights and walls, where metal seals loosen or rust over time.
- Rubber boots around plumbing vent pipes, which crack and dry out in the sun.
- Missing, cracked or lifted shingles, often after wind storms.
- Roof valleys, where two slopes meet and a lot of water flows.
- Ice dams in winter, which push water up under the shingles at the roof edge.
- Clogged gutters, which let water back up under the roof edge.
What to do right now
Put a bucket under any drip and move furniture and electronics out of the way. Take photos for your records. Don’t go up on the roof yourself, especially when it’s wet; a professional can find and fix the problem far more safely.
When to call a roofer
Any active leak is worth having looked at quickly. Small leaks get expensive when water soaks the decking, insulation and drywall over time. A roofer can trace the leak to its real source, which saves you from paying to fix the wrong spot.