Are you looking for a contractor?

Submit our quick form and get quotes now!

Table of Contents


3 min read

Everything You Need to Know About Roof Flashing


min read

Everything You Need to Know About Roof Flashing

RoofEverything You Need to Know About Roof Flashing

It is no secret that a leaky roof can have severe budgetary repercussions: moisture problems, heat loss, and property damage.

To avoid such problems, avoid neglecting the installation of flashing on your roof.

Roof Flashing 

Definition & Purpose 

house_everything you need to know about roof flashing

Roof flashing—whether plastic, aluminum or steel—is a form of moulding that can be found in many different roof areas: in valleys, around plumbing vents, at the base of chimneys or roof vents.

Its purpose is to ensure that the roof is watertight in regard to the above-mentioned sections. Specifically, it allows the water to drain to the gutters and not stagnate on the surface of the roof, thus avoiding any water infiltration.

Furthermore, the seal provided by the flashing also prevents heat loss and therefore, any further expenses added to your heating bill. 

While mortar flashings can be made by a seasoned professional, the materials above-mentioned are more durable and the fact that they are premade significantly speeds up their installation.

Note that some flashings are fitted with an apron. This type of flashing (usually made of lead) is concealed under the roofing material to optimize waterproofing.

roof flashing_everything you need to know about roof flashing

Installing Roof Flashing

Looking to install your own roof flashings? While it is possible to do so, note that it is a task that presents its share of challenges, including working at heights and having good manual skills in order to adequately perform the installation. So, feel free to call in a professional contractor!

Maintenance Needed

Surely you want your flashings to last through the years while still looking good? Make minor repairs as soon as they are needed.

Have you noticed any small holes in your flashing? Do not wait to seal it with a gutter putty, do it right away! Make sure to clean the surface beforehand with a small wire brush.

Need more information regarding new roofing materials? Check out our article Which Roofing Material Will Best Suit Your Needs?


roof flashing_everything you need to know about roof flashing

To ensure roof flashing has maximum adhesion to the roofing material, it is equipped with a counter-flashing. There are two types of flashing: external and internal flashing.

External flashing: External flashing or exposed flashing is used to prevent moisture from seeping into the existing structural walls where the roof intersects the wall.

Internal flashing: Internal flashing or concealed flashing collects water that has penetrated any given wall of the building and then drains it out of the wall through drain holes.

Note that, ideally, around a chimney, vent, or any plumbing that is found on a roof, a base flashing should be fixed before installing the counter-flashing to ensure that the area is as watertight as possible. 

Looking to get a cost estimate for your roofing project? Try out our cost calculator!

Get 3 renovation quotes for your roofing project will put you in contact with 3 reliable contractors for your roofing renovation project. Fill in the form on our homepage (it only takes a few minutes), and you will receive quotes from trusted professionals.

Dial 1-844 828-1588 to speak with one of our customer service representatives.

Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Last modified 2023-11-07

List of sources

Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Looking for something else?

Table of contents

Get 3 free quotes for your project!

Submit a project and get 3 free quotes!

Are you a contractor?

Join our network and receive real leads!

Download the price guide for renovations

We’ll be emailing you the latest market price guide for renovations.

Related articles

The latest industry news, interviews, technologies, and resources.

5 min read

N/A • 07 Nov 2023

Are your DIY renovations breaking the law? | Renovation Quotes

Regardless of the scale or size of a home renovation project, before getting started, it’s common to ask yourself how much you’re actually capable of doing. Of course, you’re going to come with your own set of skills and previous renovation experience and thus, you’ll know how much you can do. But have you ever thought about the legal repercussions of renovation projects?

3 min read • 07 Nov 2023

What's Acetylated Wood?

Who wouldn't like to add a hint of wood to their decor or integrate it as part of a construction project? Wood suits almost every aesthetic, it's available in countless different finishes, can be used for just about anything, is derived from a renewable source, and is perfect to scaffold zero-carbon buildings. 

5 min read

Amanda Harvey • 07 Nov 2023

Subsidies and Tax Credits for Renovations in Ontario | Renovation Quotes

As we all know too well, renovating your house or home can be extremely costly. Not everyone is able to spend the necessary funds on projects they may want or need to carry out.

4 min read

N/A • 07 Nov 2023

Reasons To Hire An Electrician: Indoor Projects

Some capable homeowners may feel comfortable tackling electrical work themselves. Replacing a light bulb or a circuit might seem a simple task. However, hiring an electrician simply makes sense in terms of respecting your budget, keeping your family safe as well as saving time and energy. Electrical contractors are crucial to home electrical projects running smoothly, as they understand the dangers of electrical work and know how to navigate them correctly.

8 min read • 09 Feb 2024

Patio Pavers: How to Choose the Right Ones

Building a patio is a great way to elevate your outdoor space, designing the ideal area to lounge, entertain guests, or simply enjoy the outdoors. Choosing your patio pavers isn’t just a stepping stone, but the initial step, impacting not only your patio’s aesthetics, but also its long-term durability and maintenance. Whether you’re looking for something natural, modern, or unique, this article will guide you through the essential criteria to consider when selecting the perfect pavers for your patio space.  

Looking for a contractor?

Submit a project and get 3 free quotes now!