Top 5 Reasons Your Roof is Leaking

A leaking roof is one of those problems you don’t want to ignore. Even a small drip can lead to bigger issues like water damage, mould growth and structural trouble.

And let’s face it – no one wants to deal with buckets on the floor every time it rains. The tricky part? Roof leaks aren’t always easy to trace.

Water can travel along beams and rafters, making it hard to pinpoint where the leak actually started. But don’t worry – we’re here to help you get to the bottom of it.

In this blog, we’ll break down the top five reasons your roof might be leaking. From missing shingles to blocked gutters, we’ll explain what to look out for and how to stop the water from making its way inside.

1. Damaged or Missing Shingles (and Tiles)

Shingles and tiles are your roof’s first line of defence against rain, wind and sun. When they’re damaged or go missing, it creates an easy entry point for water. Here’s what to look out for:

• Cracked or curled shingles or tiles – These can’t properly shield your roof from moisture, especially during heavy rain.
• Missing shingles (and tiles) – Gaps in the roofing surface expose the underlayment, making it vulnerable to leaks.
• Granules in your gutters – If you spot shingle granules collecting in your gutters, it’s a sign your shingles are wearing out.
• Exposed nail heads – Nails that were once covered can rust and let water seep in.
• Discolouration or dark patches – These may indicate water has already gotten beneath the shingles.

If you spot any of these signs, it’s best to have a roofer inspect the area. Replacing a few shingles and tiles early can prevent a major leak later.

2. Cracked Flashing

One of the most common – and sneaky – causes of roof leaks is cracked flashing. Flashing is the thin metal sheeting installed around roof joints, chimneys, skylights and vents to direct water away from vulnerable areas.

Over time, roof flashing can become brittle due to constant exposure to sun, wind, and rain. If it cracks or lifts, water can easily sneak underneath and start dripping into your ceiling.

You might not notice the damage right away because it’s often hidden under shingles or tiles. However, signs like water stains on your ceiling or damp spots in the attic can be a clue. Sometimes, flashing is improperly installed or sealed with roofing cement that dries out and cracks over time.

The good news is that a roofer can usually fix or replace cracked flashing without redoing the entire roof. If you spot a leak, it’s a smart idea to get it checked before the problem gets worse.

3. Blocked Gutters

It might not seem like a big deal, but blocked gutters are a major reason roofs start leaking. When gutters can’t drain properly, water backs up and can find its way under your roof. Here’s how it happens:

• Leaves and debris buildup – Over time, fallen leaves, twigs and dirt can clog gutters, stopping water from flowing.
• Water overflow – When gutters are blocked, rainwater overflows and pools near the edges of your roof, increasing the chance of leaks.
• Damage to fascia boards – Overflowing water can rot the wooden fascia boards behind your gutters, leading to structural issues and water damage.
• Ice dams in winter – In colder climates, blocked gutters can lead to ice dams, which prevent proper drainage and cause water to back up under shingles.
• Pests – Stagnant water and debris can attract insects and small animals, which may cause further damage.

Regular cleaning and maintenance go a long way in keeping your roof leak-free.

4. Worn Roof Valleys

Roof valleys are the V-shaped channels where two roof slopes meet, and they’re designed to guide rainwater down into your gutters. Because they deal with a large flow of water, they’re particularly prone to wear and tear.

Over time, the materials in these valleys can crack, corrode, or simply wear out – especially if your roof is older or has experienced severe weather.

When a valley becomes worn or damaged, water can seep through and find its way into your home. You might notice water stains on the ceiling or even see a visible sag or gap in the valley area from the outside.

Leaves and debris can also clog roof valleys, preventing water from draining properly and increasing the risk of leaks. Regular roof maintenance, especially after storms, can help catch valley issues early. If ignored, a worn roof valley can lead to more costly water damage down the track.

5. Poorly Sealed Roof Fixtures

Roof fixtures like chimneys, skylights, vents and satellite dishes are common leak hotspots – especially when they’re not sealed properly. If the sealant around these areas wears down or cracks, water can easily seep in.

Here’s what to watch for:

• Cracked or deteriorating sealant – Over time, caulking or flashing around fixtures can dry out, shrink or break apart.
• Gaps around skylights or vents – Poor installation or shifting materials can leave small openings where water can sneak through.
• Loose or missing flashing – Flashing helps direct water away from fixtures; if it’s damaged, leaks are almost guaranteed.
• Signs of rust or corrosion – Metal components around roof penetrations can rust, weaken, and eventually let water in.
• Water stains near fixtures inside your home – These are often the first clue something’s gone wrong on the roof.

Regular roof inspections and resealing when needed can help keep your roof watertight.

Preventative Measures to Protect Your Roof

A little roof maintenance goes a long way in preventing leaks and expensive repairs. Here are some easy preventative steps to keep your roof in great shape:

• Inspect your roof regularly – Check for missing shingles or tiles, cracked flashing, or any visible damage at least twice a year.
• Clean your gutters – Blocked gutters can cause water to back up and seep into your roof. Clear them out, especially after autumn and storms.
• Trim overhanging branches – Trees dropping leaves or branches onto your roof can cause damage or clog gutters.
• Check your attic – Look for signs of leaks inside, like water stains, mould, or musty smells.
• Schedule professional inspections – A qualified roofer can spot issues you might miss and fix small problems before they get worse.
• Seal around roof fixtures – Ensure skylights, vents, and chimneys are properly sealed to keep water out.

Taking these simple steps can help extend your roof’s life and keep your home dry year-round.

Keep Your Home Dry and Safe

Roof leaks can sneak up on you, but they’re often preventable with a bit of care and attention.

From cracked flashing and worn roof valleys to blocked gutters and damaged shingles and tiles, the most common causes are usually easy to spot if you know what to look for. Even small issues like poorly sealed roof fixtures can lead to big problems if left unchecked.

Fortunately, regular maintenance and timely repairs can save you from major headaches and costly water damage down the line. If you’re ever unsure about your roof’s condition, don’t hesitate to call in a professional.

Catching problems early is the key to keeping your home safe, dry and protected – rain, hail or shine.

Please note: This information is provided for advice purposes only. Regulations differ from state to state, so please consult your local authorities or an industry professional before proceeding with any work. See our Terms & Conditions here.

Frequently Asked Questions About Leaking Roof Repairs

Do you have any questions about coping with a leaking roof? If so, we’ve got answers to some of the most commonly asked questions right here.

How do I know if my roof is leaking?

Sometimes it’s obvious – like a drip coming from the ceiling. But leaks can also show up as water stains, bubbling paint, mould or a musty smell in the attic. You might also notice damp patches on walls or ceilings after heavy rain. If you spot any of these signs, it’s worth having your roof checked.

Can I fix a roof leak myself?

It depends on the cause and your comfort level with heights and tools. Cleaning gutters or replacing a shingle might be manageable, but anything more complex – like flashing repairs or major damage – is best left to a professional roofer. A quick DIY fix could make things worse if not done properly.

How much does it cost to fix a leaking roof?

Costs vary based on the damage. Minor repairs might be a few hundred dollars, but more serious issues – like replacing valleys or large sections – can be more expensive. Getting a quote from a licensed roofer is the best way to know what you’re dealing with.