How to Prepare Your Roof for an Atmospheric River in Vancouver, BC (and Avoid Costly Roof Water Damage)

Vancouver’s Wet Reality: Is Your Roof Ready for the Next Atmospheric River?

If you live in Vancouver’s Lower Mainland, you're no stranger to heavy rain. But over the last few years, many major rain events such as atmospheric rivers and pineapple express have become a growing concern for homeowners. Atmospheric rivers are weather events that include intense, narrow bands of moisture that bring relentless downpours. One of the biggest risks during these weather events? Roof water damage.

Without proper preparation or installation, a storm can turn a small roof leak into a big, expensive problem. Here’s how you can safeguard your home and your peace of mind.

What is an Atmospheric River?

An atmospheric river is a concentrated stream of moisture in the atmosphere, capable of dumping hundreds of millimetres of rain in just a few days. In Vancouver, these weather events are becoming more frequent and intense. In October 2024, Vancouver experienced a fierce atmospheric river which resulted in significant water damage for homeowners, including leaks and flooding.

Why Roof Water Damage is a Big Deal in Vancouver

Roof water damage isn’t always immediately visible, which is why it can be so disastrous for homeowners. Water can seep in through cracked shingles, clogged gutters, or poorly sealed flashing, silently damaging your attic, insulation, drywall, and even the structure of your home. With the consistent rainfall we see in Vancouver, water damage can worsen quickly and cost thousands in repairs.

7 Steps to Prepare Your Roof for Vancouver's Atmospheric Rivers

1. Get a Roof Inspection Before the Storm Hits

Schedule a professional roof inspection—especially if your roof is older than 10 years (the typical lifespan of a roof). Vancouver’s wet climate takes a toll, and catching issues early can prevent long-term water damage.

Greater Vancouver Roofing recommends inspecting in the spring/summer when it is dry out to ensure that you can make any repairs before periods of heavy rainfall. Contact us to get a quote.

2. Clean Your Gutters and Downspouts

Clogged gutters are one of the top causes of roof water damage. Leaves, moss, branches, and debris can block water flow, causing overflow that seeps under shingles or into your siding.

✔️ Tip: In the fall, check your gutters at least once a month, especially for homes that have a lot of nearby trees like in neighbourhoods such as Kerrisdale and Dunbar.

3. Trim Overhanging Branches

Large branches can damage shingles during windstorms or drop debris that clogs gutters. Keep nearby trees trimmed to reduce risk—especially in areas like North Vancouver where tree coverage is heavy.

4. Check Flashing and Sealants

Flashing around chimneys, skylights, and vents can deteriorate over time. Re-seal any gaps to keep water out during torrential rains.

5. Replace Missing or Damaged Shingles

Even a single missing shingle can lead to roof leaks and water infiltration. Fix issues before the storm, ideally during the summer months. Learn more about roofing repair.

6. Improve Attic Ventilation and Insulation

Good attic ventilation helps prevent moisture buildup and mold, while proper insulation keeps your home energy efficient. It’s a win-win for long-term roof health.

7. Install a Rain Diverter or Drainage System

Standing water around drains can lead to major issues with water damage. Ensure drains are clear of debris and water is flowing unobstructed. For homes in sloped areas like West Vancouver, consider additional drainage solutions to channel heavy runoff away from your home’s foundation.

What to Do If You Suspect Roof Water Damage

During and after an atmospheric river, inspect your ceilings and attic for signs of water: 

• Water stains 

• Mold or mildew smells 

• Sagging drywall 

• Peeling paint

• Drips, leaks, or wet spots

If you notice any of these, immediately contact a local roofing professional in Vancouver, such as Greater Vancouver Rooming. Steps that you can take to avoid spreading the damage include:

• Locating the source of the leak and sealing it off using tarps for short-term solutions

• Use fans to dry out the area (this is key to avoiding mold)

• For significant leaks or water damage, contact a restoration company

Stay Ahead of the Storm

Atmospheric rivers aren’t going away anytime soon, but roof water damage doesn't have to be part of the equation. Regular maintenance and storm preparation allow your roof to stand strong against Vancouver’s wildest weather.

Need help getting your roof ready for the rainy season? Contact Greater Vancouver Roofing today.  We understand Vancouver’s unique roofing challenges and can help you weather any storm.