Short answer
Catch the water, protect what's below it, and switch off electricity to any wet fixture. If the ceiling is bulging, poke a small hole at the lowest point to drain it into a bucket. Then photograph everything and call a roofer to tarp or repair once it's safe. Don't go onto the roof during the storm.
1. Protect the inside
The first priority is limiting interior damage, which usually costs more than the roof repair.
- Put buckets, bins or towels under every drip.
- Move furniture, rugs and electronics out of the way, or cover them with plastic.
- If water is near a light fixture or outlet, switch that circuit off at the breaker panel.
- If the drywall is sagging with water, poke a small hole at the lowest point with a screwdriver so it drains into a bucket instead of collapsing.
2. Find where it's coming in
If you can safely get into the attic, take a flashlight and look above the stain. Water usually enters higher on the slope and runs along rafters or decking before dripping. Look for wet wood, dark trails and soaked insulation, and don't step between ceiling joists.
Note the conditions. Leaks only in wind-driven rain usually point to flashing, vent boots or lifted shingle edges. Leaks during winter thaws in snowy states are often ice dams.
3. Document for insurance
Take photos and video of the ceiling, the attic, any damage visible from the ground, and anything in the yard such as shingles or limbs. Write down the date and time the leak started and what weather caused it.
4. Get it covered
A roofer can install an emergency tarp over the ridge, secured with wood battens so wind can't peel it off. That buys time for an inspection and, if needed, an insurance claim. Keep the receipt; reasonable steps to prevent further damage are often reimbursed on covered claims.
What not to do
Leaks make people want to act fast, but some moves make things worse.
- Don't climb onto a wet, icy or storm-damaged roof.
- Don't smear roofing cement over shingles in the rain; it doesn't stick and can hide the real cause.
- Don't chip at ice dams with tools.
- Don't ignore a slow leak: wet insulation and drywall can grow mold within a day or two in warm weather.
When to call a roofer
- Water is actively coming through a ceiling or light fixture.
- Shingles, decking or a tree limb are missing from or lying on the roof.
- The leak comes back with every storm or thaw.
What the roofer does: see roof leak repair.
Common questions
Can a roofer fix a leak while it's raining?
Usually not permanently. A roofer can tarp in a break in the weather and make the permanent repair once the roof is dry.
Will my homeowners insurance cover the leak?
Sudden damage from a covered storm often is covered; leaks from age and wear usually aren't. Document the date and cause.
How fast does mold grow after a roof leak?
In warm, humid conditions mold can start within 24 to 48 hours on wet insulation and drywall, so dry or replace wet materials quickly.
Editorial note: this guide is general information for homeowners, not a diagnosis or insurance advice. Conditions vary by roof, so a roofer should inspect and confirm the cause before any repair.