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Flashing Between Brick and Siding: What You Need To Know

Is water leaking from your living room wall because of your builder’s mistake? We can understand your rage and tension. But if you want to control the damage, you need to come forward and deal with it. 

Probably wondering, if you can install flashing between brick and siding

Yes, it’s possible. Installing flashing is considered to be the best solution to prevent water damage. But this is a complex process. First, you need to think about the environmental conditions and flashing type. After that, you can start installing the flashing.

That was just the highlight, a lot is yet to come. Now is the time to proceed further. So, let’s fasten your seatbelt and start the journey. 

Why Flashing is Necessary 

Flashing is necessary for moisture management. As it’s made of water-resistant materials like vinyl, sheet metals, and galvanized steel. Therefore, they can prevent water leakage. 

Masonry walls can also easily absorb rainwater and moisture. When water is stuck behind the wall and siding, there can be severe consequences. 

That’s why, flashing should be installed on walls, windows, doors, and even roofs.

Locations that Need Flashing 

Flashings can be installed anywhere to interrupt the water flow. Especially locations that have a downward flow of water inside the wall. It can cover both inside corners and outside corners. 

Here’s a list of some locations that need flashing more than other locations:

  • Base of Wall
  • Penetrations
  • Lintels over opening
  • Caps and Rowlocks
  • Beam Pockets 
  • Under Sills

Consider looking into applying to flash to these areas. You might need to put flashing between your concrete wall and siding too. 

Factors to Keep in Mind Before Installation

This is obviously a huge project, so you need to be prepared. Here are some things that you need to be concerned about before starting. 

Considering the Surroundings

Flashing is the mechanism of preventing moisture and fluids. So, obviously, it’s related to environmental conditions. The dew point, humidity, temperature, and other factors can have a huge impact on the siding and brick. 

Your job here is to assess the environment before installing the flashing. 

Identifying Your Flashing Type

A large variety of flashing types does exist. So, when you’re thinking about installing one, you need a basic idea of your problem. Then you can choose which type would go perfectly with your situation. 

For instance, the base of a wall needs very well-structured flashing. In case, any water bypasses the flashing and reaches the wall. So, water can keep sitting in the wall as it does in a shower tray. As a result, the chance of serious water leakage is higher than usual. 

While choosing your necessary flashing, keep these things in mind:

  • The angular location 
  • The material of the flashing
  • The probable reaction between the siding element and the flashing object

For most cases, vinyl flashings are the best choice as they don’t react with other objects. Metal flashing(zinc, lead, aluminum) has a higher rate of reacting to fluids. 

If you’ve already chosen your flashing, it’s time to get to work. 

4 Steps for Installing the Flashing 

Step 1: Preparing Your Toolbox 

Obviously, you need to collect some tools before starting. So here goes the list of the necessary equipment:

  • Measuring Tape
  • Siding ( of your choice)
  • Flashing (of your choice)
  • Jigsaw
  • Silicone Adhesive

You’ll need to use some extra tools according to your flashing type. Like, you can use a jigsaw to cut metal flashing similar to cutting ductwork.

Step 2: Measuring the Siding and Installation Area

Firstly, you need to measure the length of the siding that you’re planning to trim. This is to make sure we can insert the flashing. 

Taking the measurement of the installation area is also important. So, get out your measuring tape and write these numbers down!

Step 3: Installing the Flashing 

It’s time to move towards the installation part. You can follow the below-mentioned steps to install the flashing. We’re talking about L-shaped flashing, as that’s the most common option.

For other flashings, you can follow similar steps. But it’s best to look at the instructions.

First, insert the L-shaped flashing under the bottom row of the siding. For wood siding, trim it into a minimum of ¼ inches (6.4mm). 

Apply silicone adhesive on the ¼ inches of the outer edge. You can use a single bead for smaller L-strips while going across the centerpiece. 

Step 4: Locking the Flashing and Beautifying  

Lock the flashing behind the brick wall and under the bottom of the siding. For setting the flashing properly, you’ll need a good adhesive. Silicone ones will be the best in this regard. 

To save you from thinking which product would be good. We’ve provided our best picks of silicone adhesives here:

Product 1


Product 2


Exposure to the outer surroundings can be reduced by doing this. You can put color on it or design it as you wish. It‘ll give the wall a better look. 

Yes, we’re finally done with putting flashing on the brick wall completely! 


Question: Can you cover brick with siding?
Answer: Siding needs to be installed upon a smooth surface. So it can’t cover the brick directly. Firstly, you need to cover the brick with a layer of sheathing. This makes it smooth. Then you can install siding on it. 

Question: What are sidings used for?
Answer: Siding is the protective material used on the outer surface of a house. It’s used to keep the building safe from rainwater, stormy winds, insects, and other dangers. 

Question: What is exterior flashing?
Answer: Exterior flashing is the mechanism of directing the water flow away from home. Essentially, it guides the water from the inside and dumps it outside.

Take Away

That’s all you need to know before adding flashing between brick and siding.

Hopefully, your experience will be smooth and exciting. So that you don’t have to face too much trouble!

Best of luck with your project of installing flashing!