Why You Need Flashing For Corrugated Roofing

Why You Need Flashing For Corrugated Roofing

You may be wondering about the significance of having flashing installed on a corrugated roof. Keeping your roof in excellent condition is not just important. It's absolutely necessary.

Corrugated metal roofs can easily suffer water damage and are susceptible to wind and temperature changes. Allow me to clarify the importance of roof flashing for your corrugated roof.

What is roof flashing?

Roof flashing is made from metal. It's a material that guides water away from critical areas of the roof. These critical areas encompass:

  • Joints
  • Edges
  • Walls and chimneys.

Flashing is a shield against water penetration. This can harm the integrity of the roof and the interior of the structure.

Metal roof flashing

Metal roof flashing is a popular choice for roofing because of its:

  • Strength
  • Long lifespan
  • Ability to resist the elements.

It endures tough weather conditions and effectively blocks water from seeping through. This makes it a dependable option for safeguarding corrugated roofs.

Why is corrugated roof flashing so important?

Corrugated roofs are not only strong but look attractive too. Their wavy design can pose difficulties in waterproofing, however. This makes flashing extra important.

Flashing ensures that water flows off the roof correctly. This guards against:

  • Leaks
  • Rust
  • Potential harm to the structure.

Without flashing, corrugated roofs are vulnerable to water seepage at:

  • Joints
  • Edges
  • Openings

This leads to expensive fixes and poor stability.

Materials used in roof flashing

Roof flashing is made from:


Aluminum is lighter than other flashing materials. It’s also resistant to corrosion. So, it will look good on your roof for years to come. Even better? It’s easy to install - great news for DIYers.


Steel is a sturdy and long-lasting material for roof flashing

Galvanized steel options provide protection against corrosion. Stainless steel ensures durability.


Copper is visually appealing, although it comes at a cost.


Flexible and malleable, often used in complex flashing situations, though less common today due to environmental concerns.

Types of metal roof flashings

Different types of roof flashing are needed in a roofing system. Each protects a different part of the roof. Let's take a look at the different types you need for corrugated roofing, specifically.

Apron flashing

  • It shields the connection point between the roof and a vertical surface, like a wall or chimney.
  • Placed at the bottom of vertical surfaces to guide water away from where they meet.
    Drip edge flashing
  • Redirects water away from the fascia. Directs towards the gutters.
  • Mounted along the edges of the roof. This prevents water from seeping beneath the roofing materials.

Valley flashing

  • Diverts water from roof valleys into the gutter system.
  • Installed in valleys where two sections of roofs meet for proper water drainage.

Step flashing

  • Safeguards the joint between the roof and a vertical surface, especially in areas with step-like patterns.
  • Corner flashings are arranged in a staggered pattern at intersections of roofs and vertical surfaces like walls or chimneys.

Counter flashing

  • Covers and safeguards the top part of step flashing.
  • Placed over-step flashing where roofs intersect with vertical surfaces for added waterproofing protection.

Ridge cap flashing

  • Seals off the edge of the roof (where the barge capping is). This prevents water infiltration at its highest point.
  • Applied along the ridge line of rooftops to ensure a watertight seal at its peak.

Vent pipe flashing

  • Seals around pipes and vents that go through rooftops.
  • Installed at pipe and vent bases to prevent any water leakage through these openings.

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How frequently should roof flashing undergo inspection?

Check your roof flashing at least twice a year. Do this during the spring and fall seasons. Additionally, it's crucial to inspect flashing after severe weather occurrences like:

  • Heavy rain
  • Windstorms
  • Snowstorms

Is it better to DIY install roof flashing or hire a professional for the job?

Some skilled DIYers can install flashing properly. However, we advise enlisting the services of a professional roofer.

Proper installation is needed to protect your roof against water damage. A professional will guarantee the correct installation and sealing of the flashing.

What are the indications that you need to replace the roof flashing?

If you see visible:

  • Rust
  • Corrosion
  • Cracks
  • Warping

these are telltale signs that your roof flashing needs replacing.

Leaks inside the house—particularly around:

  • Walls
  • Chimneys
  • Vents

Could also mean your flashing is failing.

How long can I expect metal roof flashing to last?

Aluminum and galvanized steel flashings usually have a lifespan of about 20 to 30 years, while steel and copper flashings, when well maintained, can endure for over 50 years. This is only when it's been properly installed.

Can you paint flashing to match the roof?

You have the option to paint metal flashing in a color that complements your roof. To ensure longevity and good adhesion it is essential to select a quality weather paint specifically designed for metal surfaces.

What are some common errors made during the installation of roof flashing?

Common mistakes include:

  • Using incorrect types of flashing
  • Not properly sealing joints
  • Insufficient overlap between pieces of flashing
  • Failing to securely attach the flashing to both the roof and vertical surfaces.

These mistakes can result in leaks and water damage.

How does flashing help protect against wind-driven rain?

Flashing creates a water shield that redirects water from areas such as rain driven by the wind. When installed correctly, flashing stops water from seeping under roofing materials and into the building during these conditions.

Is it necessary to have flashing on all types of roofs?

Flashing is essential on all kinds of roofs, such as:

  • Asphalt shingles
  • Tile
  • Slate
  • Colorbond steel
  • Metal roofing.

Each type of roofing requires flashing to guarantee proper waterproofing.

How can I make sure my roof flashing lasts longer?

Maintaining the longevity of your roof flashing involves:

  • Checking for any indications of wear or damage
  • Debris from the roof valleys and gutters
  • Ensuring proper attic ventilation to prevent condensation
  • Promptly addressing any issues identified during inspections.
  • Regular maintenance extends the lifespan of your roof flashing.

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