Roof Leaking? What to Do Right Now

Updated January 2025 • 6 min read

Alright, hopefully you're not in full crisis mode. Let's talk about what causes leaks, how to find them, and what to do next.

Why Roofs Leak

Water is sneaky. It doesn't always drip straight down. It follows paths – along rafters, down pipes, through gaps you'd never notice. Here are the most common causes:

Damaged or Missing Shingles

Wind, age, or impact damage leaves gaps. Water gets under the remaining shingles and into the deck.

Failed Flashing

Flashing is the metal pieces around chimneys, vents, skylights, and roof joints. It's supposed to direct water away from vulnerable spots. When it fails – rusts through, lifts, or loses its seal – water gets in. This is probably the #1 leak cause.

Clogged Gutters

Backed up gutters push water under the roof edge. This causes soffit damage and can work its way inside.

Ice Dams

In winter, ice buildup at the roof edge traps water behind it. That water has nowhere to go but under your shingles.

Condensation

Not technically a "leak" but produces the same result. Poor attic ventilation causes moisture to condense on the underside of the deck. It drips down like a leak. Common culprit when the "leak" only happens sometimes.

Plumbing/HVAC Issues

Sometimes what looks like a roof leak is actually a plumbing leak from above, or condensation from AC ductwork in the attic. Worth checking before assuming roof.

Finding the Source

Here's the frustrating part: where water shows up inside isn't necessarily where the leak is. Water can travel 10 feet or more before it drops through your ceiling.

Start in the Attic

If you have attic access, go up there during or right after a rain (carefully – it might be slippery). Look for:

• Active dripping
• Water trails on rafters or decking
• Dark stains or discoloration
• Wet insulation
• Daylight showing through (shouldn't happen)

Trace any water trails upward to find the entry point.

Check the Usual Suspects

Most leaks happen at:

• Around chimneys
• Around vent pipes
• At roof valleys
• Around skylights
• Where additions meet the main roof
• At flashing points

The Garden Hose Test

If you can't find the source, have someone inside while you spray sections of the roof with a hose. Start low, work up. When they yell "I see water!" you've found the area. (This is a two-person job. Don't try it alone.)

Temporary Fixes

You've found the general area. A roofer can't come until tomorrow. Here's how to minimize damage:

Tarping

A tarp is your best friend for emergency leaks. Get one big enough to extend past the damaged area on all sides. Secure it with weights or sandbags – don't nail through it.

Important: tarps are temporary. They blow off, they shift, they eventually fail. Don't leave a tarp up for months thinking the problem is solved.

Roofing Cement

For small issues like lifted flashing or a gap around a pipe, roofing cement (also called roof tar or sealant) can provide a temporary seal. It's available at any hardware store. Clean the area, apply liberally, smooth it down.

Again: temporary. This buys time, not years.

Bucket Brigade

If you can't stop the leak, contain it. Buckets, plastic bins, towels under them to catch splashes. Empty regularly. Check throughout the night if rain continues.

When to DIY vs Call a Pro

You Can Probably Handle:

• Replacing a single cracked or missing shingle (if you're comfortable on roofs)
• Applying sealant to a minor flashing gap
• Clearing debris from a valley
• Unclogging gutters

Call a Professional For:

• Anything requiring you to work on a steep slope
• Multiple damaged shingles
• Chimney flashing issues
• Skylight leaks
• Leaks you can't locate
• Any structural damage
• Warranty concerns (DIY repair might void coverage)

The Hidden Damage Problem

Here's what people don't realize: by the time you see water dripping inside, damage has been happening for a while. The leak path gets soaked first. Insulation absorbs water. Wood starts to rot.

Getting the leak fixed quickly isn't just about stopping the drip – it's about preventing or limiting the hidden damage. The longer water gets in, the worse it gets.

After the leak is fixed, have someone look in the attic to assess what got wet. Saturated insulation should be replaced. Any wood showing signs of rot needs attention.

Insurance Considerations

Most homeowner's policies cover sudden damage (like a storm ripping off shingles). They usually don't cover gradual damage (like a slow leak you ignored for a year).

Document everything. Take photos of the damage, inside and out. Note when you first discovered it. Keep receipts for any emergency repairs. This makes the claims process much smoother.

Preventing Future Leaks

Once you've dealt with this leak, think about prevention:

• Annual roof inspections catch problems early
• Keep gutters clean
• Trim trees that hang over the roof
• Check attic after major storms
• Address small issues before they become big ones

A leak is stressful. But it's usually fixable. Take a breath, minimize the immediate damage, and get a professional out to handle it properly.