Why Is My Roof Leaking in Heavy Rain? (And What to Do Now)
A roof that's fine in light showers but leaks in a downpour is telling you something specific. Here's what's usually behind it and the steps to take while you wait for a roofer.
Get a Free Roof QuoteWhy heavy rain specifically
Light rain runs straight off. Heavy, wind-driven rain pools, backs up and gets pushed sideways under tiles and flashing — so gaps that never leak in a drizzle suddenly let water through. That's why the timing points to a few usual suspects.
The common causes
- Cracked or slipped tiles — the classic. One or two broken tiles let water straight onto the sarking.
- Failed flashing — around chimneys, skylights, walls and vents. Old or lifted flashing is a leading cause of heavy-rain leaks.
- Valley problems — the metal channels where two roof sections meet carry the most water and rust or block first.
- Blocked or overflowing gutters — water backs up under the roof edge instead of draining.
- Failed pointing/bedding — the mortar holding ridge caps cracks with age and lets water in at the peak.
- Perished sarking — the under-roof membrane that's meant to be the backup has degraded.
What to do right now
- Move furniture and electronics clear, and put a bucket under the drip.
- If the ceiling is bulging with trapped water, a small pinhole from below can release it safely into a bucket rather than letting the whole ceiling come down.
- Don't get on a wet roof yourself — it's the most common way people get hurt in a storm.
- Photograph the damage inside and out for insurance.
- Book an emergency make-safe if it's actively pouring in.
Frequently asked questions
Can a roof be leaking even if I can't see missing tiles?
Yes — flashing, valley and pointing failures leak heavily in rain with no obvious missing tiles from the ground.
Should I go on the roof during the storm?
No. Wet roofs are extremely slippery — wait for a roofer with proper safety gear. Manage it from inside until then.
How fast can someone come out for an active leak?
For urgent leaks a local roofer can often attend the same day for a temporary make-safe, then quote the permanent repair.