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Ultimate Guide: How to Install Roof Flashing, Repair, and Types

Roof Flashing

You can define roof flashing as a fragile material that is used by roofers. The purpose of using this material is to direct the water away from some specific areas. These areas may include roof valleys, chimneys, and walls that are present on your roof. There are different types of metals available in the market that are used for roof flashing.

Do not forget to hire a professional roofer to get quality services. Moreover, he also helps choose the suitable material for roof flashing so that you can be provided with quality and long-lasting benefits. You must consider this guide if you want to learn more about roof flashing installation, repair, and its types.

Introduction to Roof Flashing

Roof flashing has become common since the 1980s. At the early ages, it was used for only one or two-family houses. These were houses that were made up of asphalt shingle roofs. Later on, the advancements in the roofing materials started, so the advancement in roof flashing also took place.

The word roof flashing has been derived from the word flasshen, where it means to splash or to sprinkle. The strips of the lead hat are used for the purpose of roof flashing an edge are known as an apron. Roof flashing is essential for your house if you are concerned about protecting the weak points of your roof. Plus, it also protects the roof from getting damaged due to water.

What Is Roof Flashing?

Basically, roof flashing is a material that is used for roofs to protect them from water damage. It is helpful for keeping the water away from common areas of the roof so that they do not get damaged. Roof flashing can be made up of steel, copper, or aluminum, which is helpful in preventing the water from getting under the shingles.

Roof flashing is a material that can be used to protect certain areas of your roof such as chimneys, walls, and roof valleys from rainwater, etc. Because water will damage your roof if it will leakage through your roof to your home.  It's a very essential roofing material that every roof requires to maintain its presence.

Roof flashing is a thin and Flat material Used to block the water from entering cracks and holes of a roof. It is settled below the shingles of your roof and it converts the flow of water to another location. It is made from metals like aluminum, stainless steel, copper, and galvanized steel. It is also available in materials such as Lead. Roof flashing companies can fix the flashing materials around gutters Windows and chimneys.

There are various flashing metal choices to select for your roof flashing. High-end roofing companies will suggest you install the flashing material on every joint of your roof where water drains out. The common types of materials used for roof flashing are steel, aluminum, or copper because they are less expensive and they have durability. If you want to make your roof luxurious, then copper is the best metal. Because it looks great aesthetically it has great durability but it is an expensive material.  

Moreover, roof flashing is also necessary if you want to prevent leaks. You should check the roof regularly flashing so that you can determine if it needs maintenance or not. For this purpose, you need to look for rust, warped metal, and cracks. If you find any of these issues on the roof, you must consult a professional immediately.

Steps of Flashing Roof

You need to follow the steps mentioned below to flash a roof:

Step One:

 Install the selected underlayment under the shingles. If the shingles have already been installed, you need to remove them first and install them again after installing the flashing.

Step Two:

 Mount the kick-out flashing and place it at the base of your roof. You can use the roof cement for adhering it to the wall.

Step Three:

 Place the kick-out flashing and the first shingle and secure them using the roofing cement and some nails. Make sure you place the nails high up on the shingle.

Step Four:

 Install the shingles over the kick-out flashing and your first step flashing.

Step Five:

 Keep following steps three and four until you reach the peak of the roof.

Step Six:

 Cut and fit the shingles and flashing for setting the peak of the roof. The shingles and flashing will bend over and will create a curved application.

Steps of Install a Roof Plumbing Vent Flashing Boot

The installation of a roof plumbing vent flashing boot is not a difficult task for a roofer. All you need is to hire a professional and experienced roofer. Here are some steps that can be followed to install a roof plumbing vent flashing boot:

Step One:

Install the shingles based on the size of your roof to the base of the plumbing vent.

Step Two:

Place the boot on the plumbing vent. Make sure the base of the plumbing vent is resting on the shingles of the roof. Apply sealant for holding the flashing or boot in place so that it does not move from its actual place.

Step Three:

After applying the sealant, push the flashing or boot back to its original place.

Step Four:

Mount some more shingles. Allow the shingles to intersect the top of the flashing when you reach the plumbing vent.

Step Five:

Cut a piece of shingles in a circular shape so that a room for vent can be made.

Step Six:

Apply roofing cement beneath the edge of the shingles so that they can be secured. Make sure you also use nails for securing it.

Steps of Repair Roof Flashing

You need to repair roof flashing when it gets damaged, or you face the problem of roof leaks. If there are small holes, you can fix them easily using pinholes with roofing cement. You need to follow the steps mentioned below to repair roof flashing:

Step One:

Remove the shingles present around the damaged flashing. Also, remove damaged pieces of flashing

Step Two:

Remove the asphalt cement if it is present there.

Step Three:

Check the underlying parts of the roof and structure. Fix the damages, if any, before starting the reinstallation process of flashing.

Step Four:

Reinstall new shingles and flashing. Make sure you follow the proper order. Also, make sure that the flashing will be able to prevent water.

Steps of Install Counter-Flashing on a Chimney

If you want to install counter flashing on a chimney, you need to follow the steps mentioned below:

Step One:

Make sure the base flashing of the chimney is in an appropriate order and is secured to the roof.  

Step Two:

Use a diamond grinder disc or any related tool for cutting an indent into the chimney

Step Three:

Add the counter flashing to that indent and make sure it overlaps with the flashing by at least two inches when it hangs.

Step Four:

Secure the counter flashing to the chimney and base flashing using roofing cement.

Step Five:

Use roofing caulking to seal the indent.

Steps: Roof to Wall Flashing

We know that step flashing is used when we need roof-to-wall flashing. It is installed in layers along with the shingles. Follow these steps to undergo the process of the roof to wall flashing:

Step One:

Cut the pieces of step flashing into the width of 10 inches and length of 2 inches.

Step Two:

Bend the length of the flashing to extend five inches over the roof deck and five inches up the wall.

Step Three:

Make sure you use nail flashing to the roof deck only. Make sure you do not extend it above the top of the nail and shingle.

Step Four:

Cover the tops of step flashing. Make sure you do not nail through the top of the flashing when you are installing the siding.

When to Repair a Roof Flashing Leak?

You need to repair the roof flashing leak when you notice major damage to it. You must look at the flashing thoroughly and pay attention to the bending, holes, and damages. You should also look for rusting, missing nails, corrosion, missing sealant, and flashing.

If you notice any of these problems, you must hire a professional to get them fixed immediately. If you do not fix them on time, they may get damaged badly, and you may have to replace the flashing.

Can you Re-use Old Roof Flashing?

Yes, old roof flashing can be reused, but it depends on some conditions. For example, there should not be any potential issue with the roof flashing that could result in affecting the integrity of the new roofing system. Moreover, if there are no signs of excessive damage, deterioration, or rusting, you can re-use it.

Roof Flashing Types

There are many types of roof flashing available in the market. Some of them have been enlisted below:

Base Flashing

Two pieces of flashing are required by some of the roof features, for instance, chimneys. Its purpose is to carry the rainwater downwards.

Continuous Flashing

It is a type of flashing also known as apron flashing. It is a single and long piece of metal whose purpose is to carry the water from the roof to the shingles that lay below.

Step Flashing

It is a rectangular piece of flashing that can be bent 90o from the middle. Several flashings are installed in layers.

Counter Flashing

Counter flashing is placed above or opposite of base flashing.

Kickout Flashing

It is a type of flashing that includes the gap between the gutter and step flashing. It directs the water away from the wall and directs it towards the gutter.

Drip Edges

It is a thin metal roofing whose purpose is to allow the water to drip off the roof without damaging the house or the roof.

Valley Flashing

It is a type of flashing that protects the open valleys present on the roof.

Skylight Flashing

The purpose of skylight flashing is to keep the surface of the roofing material moisturized. It has been greatly designed for shedding the water.

Important Things to Know about Roof Flashing

Roof flashing is the latest method to protect your roof because every roof will need it. However, there are many owners who don't know the roof flashing and for what purpose it is used.

That's why we are here to assist you to understand the meanings of roof flashing and why it is important for your homes. At the end of this article, you may learn what roof flashing is and what are important factors to keep in mind. And how to find the great roofing companies that will give the professional works.

What is the Purpose of Roof Flashing?

Roof flashing gives protection for various areas of your roof and protects it from damage.  flashing is used to roofing valleys and corners as well as things that jut out over your roof.

Generally Flashing is built out of matter but it may include zinc copper steel aluminum and even rubber and plastic. Flashing material Is used to prevent any damages and to keep roof components waterproof. Without flashing roof elements like junctions between dormers, walls, and Chimneys possibly turn into contact with water and that can leak, separate, and damage the elements or the structure of the home. In short, the roof flashing gives the stability of your home determination.

Without roof flashing your roof will be more affected by water damage. Homeowners can spend thousands of dollars on the replacement or repair of roofs. So, when you next deal with installing or inspecting your roof, keep in mind that your flashing is properly fixed by the roofing company to get the best results from flashing.

Why is Replacement of Roof Flashing Necessary?

Settling new shingles is a big investment for foremost owners and it makes great sense to protect the stability and the durability of the roof for as long as possible. The main purpose of the roof flashing is to prevent the penetrations of the water from entering the roof.  As you know, flashing is a low-cost process. Otherwise, there are many planned exceptions to upgrade the roof flashing for good results.

Valley Flashing:

The valley where 2 roofs horizontal bisect takes the impact of water flow and will help from new flashing and further precautions. The best process for sealing is to fix or strip the roofing stroke In the valley through the roof deck Before fixing the roofing stroke. Then picture galvanized metal flashing through the roofing stroke, and then use the part of shingles on the top of that. A great technique of fastening and the shingles in the valley is very important. 

Vertical Wall Flashing:

Anywhere on your roof where the roof horizontally intersects with the vertical wall like chimneys, the dormers are there is a split-level roof that flashing is very important. It is not always conceivable to discard the old flashing in these points. Especially, if the upright wall is brick and the flashing was grouted into the intersections. But the new flashing is still important where old flashing can be removed with aviation snips.

Drip Edge Flashing:

The next one is drip edge flashing and it has two types one type is to protect the side or roof rake edge and the other one is to protect the gutter edge and the bottom.  Both of these types protect from entering the water into the holes.  you can get all page 10-foot strips Add a fixed to the roof deck. You can replace it but the old drip edge is in new condition.

Penetration Flashing:

Plumbing chimneys pipes that expand over the roof come with rubber boot-type flashing or with metal flashing to seal the penetrations. Then replace all Metal and Rubber boost penetration flashing unless it looks like a new condition.

How to take care of Roof Flashing Maintenance?

You have to make a habit of checking your flashing, every day you are up on the roof. Or possibly once in a year to analyze that if it’s loose or has any leaks and holes. You can notice any issues that may need to be fixed, and you can frequently spot them before any big damage occurs.

Lock it Down:

It’s ordinary for flashing to come loose and even put off from your home over time. Either the screws fixing it into place go relaxed and pull out, or the material wears away from around the edge of the hole where the flashing was originally locked down. Either way, that leaves flashing relaxed and unfit to correctly do its job. 

To break this problem, simply buy screws made of the identical material as your flashing and squinch them down into the arrangement underneath to lock the flashing into position. take over each screw head applying roofing glue, to keep water from getting into your home. You can read the Pros and Cons of Roof Flashing section for more information.

Fill Holes:

Even though flashing is allowed to be rainfall resistant, there are times when erosion or wear will bring small holes to occur. However, you don’t have to fully displace your flashing; you just have to take over that hole, if this happens. Wipe away any sharpened edges and erosion using a stiff-burst brush. 

Then, cut a small piece of flashing that’s many centimeters larger than the hole and cover this hole using roof glue or cement. Add another progressive coating of roof cement around the external edges of the spot to form a water-tight fence. 

Pros and Cons of Roof Flashing

Aluminum, copper, and steel roof flashing are the most helpful ways to seal the leaks of your roof.  There are many joints you have to seal between two points like when a roof meets with the vertical surface to walls of your house. If anything will give you advantages then it will always have some disadvantages. So, here we will discuss the Pros and Cons of Roof Flashing:


Aluminum is a very versatile and durable roof flashing and it will be fixed around the vent, and chimneys, etc. Aluminum flashing is available in multiple densities. You can double the life of this flashing by painting. It can be converted into any shape easily.  It is economical instead of copper. It has low-cost installation and fabrication. It is a soft metal and can easily convert into any shape. 

Copper is one of the most rust-proof and most durable flashing materials.  it may need professional techniques to design, fabricate, cut, and install.  For proper installation of copper, flashing requires experienced and skilled craftsmen.  It is weatherproof, long life, and has a low maintenance cost.

Galvanized steel roof flashing is also a good metal for sealing. This flashing can be bent mechanically for better results. It gives a good look and it is low-cost material. It is available in long pieces that can be used easily and quickly and it has less installation and fabrication cost.


The cons of the Aluminum flashing are listed as if we used it without painting it can rust and decay in a short time. It also has bad effects in acidic and polluted environments, and it cannot easily convert into any shape. It needs much heating for molding to get the required shape.

Similarly, the cons of copper flashing something like that is a very costly material and its installation and fabrication are also expensive.

Same thing in galvanized steel roof flashing that if you will not use paint on it, it will be spoiled in a short time. You should handle it carefully to get its software and otherwise leakage possibly starts.


In conclusion, there are different types of roof flashing available in the market. You can select any of them according to your needs and requirements. Plus, you should also consult a professional to get the installation, maintenance, repair, and replacement service with good quality. 

We’ve provided complete information about roof flashing and you can get entire data from these basic points that know all about roof flashing. As you can see, it is not an easy matter. Roof flashing does not require much maintenance. But it is even necessary to understand the basics of roof flashing maintenance. It performs an essential restriction between the components and inner part of your home.