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How To Install Metal Roof Flashing? (2024)

When it comes to home improvement, the roof often takes center stage. It’s not just about the shingles or tiles that make up the main surface of your roof; it’s also about the less visible elements that ensure its longevity and effectiveness. One such critical component is metal roof flashing.

If you’re a homeowner looking to better understand the intricacies of your roof, this blog post can assist you:

  • Metal roof flashing
  • Its importance
  • Types
  • Installation
  • Maintenance

What is Metal Roof Flashing?

davinci-roof-on-house

Metal roof flashing is a critical component in the construction and maintenance of a roof. It is a thin material—usually galvanized steel or aluminum—designed to direct water away from vulnerable areas of the roof, where the roof plane meets a vertical surface like a wall or chimney. Flashing is also used around roof features such as vents, skylights, and valleys to prevent water infiltration.

Why is Metal Roof Flashing Important?

Flashing acts as the first line of defense against water penetration, which can lead to significant structural damage, mold, and mildew. Properly installed flashing ensures that water flows off the roof and into the gutters, rather than seeping into the roof deck and underlying structure. Here’s why it’s indispensable:

  • Prevents Water Damage: Water intrusion can compromise the integrity of your home’s structure, leading to expensive repairs.
  • Enhances Roof Longevity: By preventing leaks, flashing extends the life of your roof.
  • Improves Energy Efficiency: Water damage can affect insulation efficiency, leading to higher energy costs. Effective flashing helps maintain your home’s energy performance.
  • Aesthetic Appeal: Proper flashing contributes to a neat and finished appearance, enhancing curb appeal.

Types of Metal Roof Flashing

There are several types of metal roof flashing, each designed for specific applications. Understanding these types will help you make informed decisions if you need to replace or install new flashing.

Step Flashing

Step flashing is used where the roof intersects with a vertical wall. It consists of multiple pieces of flashing that ‘step’ up the roof slope, ensuring that water sheds away from the wall and onto the roof.

  • Application: Typically used for roof-to-wall intersections.
  • Material: Often made from galvanized steel or aluminum.
  • Installation: Installed in layers with shingles to ensure water flows over the flashing and not underneath.

Continuous Flashing

Also known as apron flashing, continuous flashing runs along the length of a vertical wall or chimney.

  • Application: Used where the roof meets a vertical surface over a long distance, such as the side of a dormer.
  • Material: Generally made of galvanized steel or aluminum.
  • Installation: Installed underneath the shingles, with a slight overhang to direct water away from the wall.

Valley Flashing

Valley flashing is installed in roof valleys, where two roof planes intersect. This type of flashing is particularly important because valleys channel a lot of water.

  • Application: Used in roof valleys.
  • Material: Typically made from heavier gauge metal, given the high volume of water flow.
  • Installation: Installed before the shingles, ensuring it spans the entire length of the valley.

Drip Edge

Drip edge flashing is installed along the edges of the roof to guide water into the gutters and prevent it from seeping under the roofing material.

  • Application: Installed along the eaves and rakes of the roof.
  • Material: Commonly made of galvanized steel, aluminum, or plastic.
  • Installation: Placed under the underlayment and over the fascia to create a watertight seal.

Counter Flashing

Counter flashing works in tandem with other types of flashing to provide an additional layer of protection. It is often used with step flashing or continuous flashing.

  • Application: Typically used around chimneys and walls.
  • Material: Usually made of galvanized steel or aluminum.
  • Installation: Installed over step flashing or continuous flashing to prevent water from penetrating the joint.

Vent Pipe Flashing

Vent pipe flashing is designed to seal around vent pipes that protrude through the roof. It typically has a rubber boot that seals tightly around the pipe.

  • Application: Used around vent pipes.
  • Material: Often made from galvanized steel or aluminum with a rubber boot.
  • Installation: Installed over the shingles, with the top edge covered by the next course of shingles to ensure water sheds properly.

How to Install Metal Roof Flashing: 10 Steps

installing metal flashing

Proper installation of metal roof flashing is vital to its effectiveness. While hiring a professional is always recommended, knowing the basics can help you understand the process and ensure the job is done correctly.

Use Safety Equipment and Follow Safety Guidelines

Safety should be the top priority. Use the proper safety equipment and follow safety guidelines to protect yourself from hazards.

Before starting, inspect your ladders, equipment and protective gear for any visible defects or issues, and ensure they are in good condition. Wear protective gear such as gloves, goggles, and a hard hat to safeguard against falling debris or accidents.

Please familiarize yourself with state and government guidelines for fall prevention and roof safety procedures. To learn more, visit https://www.osha.gov

Please do the proper safety research and preparation before beginning any DIY project.

Tools and Materials Needed

  • Tape measure
  • Utility knife
  • Tin snips
  • Hammer
  • Roofing nails
  • Caulking gun
  • Roofing cement
  • Metal flashing (galvanized steel or aluminum)

Step 1: Prepare the Area

Before installing flashing, make sure the area is clean and free of debris. Remove any old flashing and inspect for damage.

Step 2: Measure and Cut Flashing

Measure the length of the area where the flashing will be installed. Use tin snips to cut the flashing to the correct length. Ensure that the flashing extends at least a few inches beyond the area to provide adequate coverage.

Step 3: Install Underlayment

Lay down a layer of roofing underlayment over the roof deck. This provides an additional layer of protection against water infiltration.

Step 4: Install Drip Edge

Begin by installing the drip edge along the eaves. Nail it in place with roofing nails, ensuring it overhangs the edge of the roof slightly to direct water into the gutters.

Step 5: Install Step Flashing

For roof-to-wall intersections, start by installing step flashing. Each piece of flashing should be placed in layers with the shingles, ensuring that water flows over the top of the flashing and not underneath.

Step 6: Install Continuous Flashing

For long vertical surfaces, install continuous flashing. Position the flashing so it extends up the wall and over the shingles. Nail it in place and seal the edges with roofing cement.

Step 7: Install Valley Flashing

For roof valleys, lay the valley flashing along the entire length of the valley. Nail it in place, ensuring it is centered and extends equally on both sides.

Step 8: Install Counter Flashing

Install counter flashing over step flashing or continuous flashing. This provides an additional layer of protection and ensures water does not penetrate the joint.

Step 9: Install Vent Pipe Flashing

For vent pipes, slide the vent pipe flashing over the pipe and position it so the top edge is covered by the next course of shingles. Nail it in place and seal around the pipe with roofing cement.

Step 10: Inspect and Seal

After installing all flashing, inspect the area for any gaps or loose nails. Apply roofing cement to seal any exposed edges or joints.

Maintaining Metal Roof Flashing

Proper maintenance of metal roof flashing is essential to ensure its longevity and effectiveness. Here are some tips for keeping your flashing in good condition:

  • Regular Inspections: Inspect your roof and flashing at least twice a year, preferably in the spring and fall. Look for signs of damage, such as rust, loose nails, or gaps.
  • Clean Debris: Remove any leaves, branches, or other debris that may accumulate around flashing. This prevents water from pooling and causing damage.
  • Re-seal as Needed: Over time, the sealant around flashing may deteriorate. Reapply roofing cement to any exposed edges or joints to maintain a watertight seal.
  • Address Rust: If you notice any rust on your flashing, use a wire brush to remove it and apply a rust-inhibiting primer and paint to prevent further corrosion.
  • Repair Damage: If you find any damaged flashing, repair or replace it promptly to prevent water infiltration and potential damage to your roof and home.

Your Metal Roofing Experts

Metal roof flashing is a crucial component of your home’s roofing system. It provides essential protection against water infiltration, ensuring the longevity and integrity of your roof. By understanding the different types of flashing, how to install it, and how to maintain it, you can keep your roof in top condition and avoid costly repairs.

If you’re unsure about installing or maintaining your roof flashing, consider hiring Shake Guys. We have the expertise and experience to ensure the job is done correctly and safely.

Ready to take the next step in protecting your home? Contact us today to discuss your metal roof flashing needs and ensure your home stays safe and dry for years to come.

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