Roof flashing is important to protect your roof from weathering and increase its lifespan. It is a vital roofing material that every roof has to have.  So, it is an absolute necessity for every household to know the steps of how to flash a metal roof to a wall.

While many people rely on the company to execute the task, it can be quite expensive. Roof flashing is time-consuming and needs much effort, but it isn’t difficult. All you need to follow the step-by-step instructions and complete the job.

Nothing to worry about, this article will help you to get your job done.

How To Flash A Metal Roof To A Wall: Steps To Follow

Without roof flashing, the wall will suffer from great damage structurally due to leakage. This leakage will reduce the lifespan of your structure which you might want to avoid.

Learning how to flash a metal roof to a wall can be beneficial. First, you should decide on the type of flashing you’ll use. You should select the type based on your requirements.

Step flashing and kickout flashing are commonly used on a vertical wall or a sloping roof. Here, we’ll talk about the process of how to install step and kickout flashing step-by-step.

metal roof flashing installation

Necessary Materials To  Flash A Metal Roof To A Wall

It will be quicker to seal if you have all of the necessary tools gathered before beginning the job. So, the necessary tools you will be needing are:  

  • Galvanized metal flashing bent
  • Foam closers
  • Impact driver with four different bits
  • Rubber pipe boot
  • Tape measure
  • Pair of offset tin snips
  • Rivet guns
  • Tape sealant and gun caulk sealant
  • Hex head screws

Safety Equipment

For every project, taking precautions is a must. So, before you begin, put on the appropriate safety gear and grab all these necessary safety equipment for your safety.

  • A sturdy extension ladder
  • Work positioning lanyard for roofing
  • Safety helmet
  • Suspension trauma straps
  • Roof safety harness
  • Lanyard
  • Carabiners
  • Rope-grab
  • Rope protector
  • Roof anchor.
  • Goggles
  • Dust masks
  • Hearing protection

Now, the rest of the article, we will discusses the step-by-step procedure in detail.

how to flash a metal roof to a vertical wall

Step 1:

First, you need to install the underlayment below the shingles. The shingles must cover the step flashing, any shingles that have already been placed must be removed before the installation of the flashing.

Step 2:

For kickout flashing, place them first, then progress from there. The kickout flashing will be installed at the roof’s base and glued to the wall with roof cement.  

Step 3: 

Set the very first shingle above the starting strip and kickout flashing, and fix it with roofing cement and two nails. Place the nails visible on the shingle. They will be covered by the next stage flashing piece. This will give a smooth effect. Using hex head screws makes your flashing more impermeable and keeps your structure safe from water damage.

Step 4: 

Complete the entire shingle path following the previous steps.

Step 5: 

Set the shingles above the previous kickout flashing. By this, you should be able to hide the seams with newly installed shingles, giving it a seamless appearance.

Step 6:

Follow steps 3 & 4 till you reach the top of the roof.

Step 7:

You’ll need to make a customized piece of flashing to flash the roof’s peak. select your step flashing piece and snip the flashing about ½ of the piece.

Step 8:

It should be fitted perfectly in its position after cutting the flashing and shingles according to the shape of your roof’s peak. To secure the arrangement, use cement and nail the base with a hex head screw. Overlay it with ridge shingle afterward.

Step 9:

These customize cuttings of the flashing and shingles will curve over the roof’s top, forming a curved arrangement that will keep the joint impermeable.

Step 10:

When all of the cap flashings have been placed, seal the gap using caulk sealant where it seems necessary.


Roof flashing is used to direct water away from certain areas of your roof. These areas are the most prone to leaks if they’re not done correctly.

You’ll be fine if you follow the step-guideline of how to flash a metal roof to a wall. Make sure you follow them properly and accordingly. 

Don’t forget to take precautions. Be safe and all the best.


As a civil engineer and roofer, I love to share the experience that I have gained through the last couple of years. In the roofing industry, practical experience is a very crucial fact that can help you a lot. Hence, I want to help you with my blog.

Write A Comment