Why Is Roof Flashing so Important?

Roofs are the first line of defence between our homes and outside moisture. During snowstorms and rainy seasons, you want the roof to prevent that water from getting inside your home. Roof shingles can’t do this on their own. Certain weak points in the roof are often covered by what is called roof flashing. It prevents all moisture penetration and it keeps your roof intact. Here are some reasons it’s such an important element of any roof.

Roof Flashing - Why Is Roof Flashing so Important?

What is flashing?

Flashing is a layer of waterproof material that is placed at specific points in your roof in order to protect it. Roof shingles don’t cover the entire surface area of your roof. Certain parts are vulnerable and prone to leakage. Chimneys, vents, and skylights are examples of additions to your roof that might become vulnerable hotspots for leaks.

The chimneys and skylights themselves won’t let water seep through them, but the areas around them might. It’s hard to install shingles to exactly match the edges of these parts of your roof. This is what flashing is used for. Instead of having the shingles surround your skylights, you have a layer of flashing which is wrapped tightly around its edges.

It’s mandatory for longevity

Having a roof without flashing is like having a fortress with short walls. It’s going to do something, but not very effectively. When purchasing a new home, you will obviously check all the structural elements that make up the roof. If it doesn’t have flashing, you will take that as a sign that it won’t last.

Homeowners have to install flashing if they want their roof to be appealing to buyers. A roof can last without flashing, but it’s going to show signs of damage after the first heavy storm that hits the area.

Protects your roof directly

The parts of the roof that can’t be protected by shingles are vulnerable to water leakage. Flashing doesn’t just protect your attic from leaks, it also helps keep the other parts of the roof in check.

Flashing is usually the first roof barrier that fails. If any amount of water enters through weak spots in the flashing, it will do damage to the rest of your roof. Because of this, it’s important that you properly install your flashing.

Layered protection

You want your roof to last a long while before you have to replace it. Every roof has a lifespan that depends on the materials that are used in its construction. Even with the best materials, only using one layer of protection on your roof will inevitably decrease how long it will last. Shingles can only do so much for so long.

Using flashing in vulnerable areas will make your roof much tougher. It can be used as a supportive layer beneath shingles as well. On many sloped roofs, flashing is set up in a way that allows any water that has already penetrated one layer of the roof to simply slide down the side of the flashing and out of the roof. This means that even the tougher parts of your roof are reinforced by proper flashing.

It prevents mould growth

Roofs are supposed to be the ultimate barriers between our homes and the elements. Even the tiniest bit of moisture could spell trouble for your roof and attic. A bit of moisture won’t damage any material your home is made out of, but it might create a suitable environment for the growth of mould.

Mould will use that bit of moisture to grow rapidly. It will slowly damage parts of your roof and cause even more leaks. Worse yet, it can even affect your attic and the inside of your home. Unpleasant smells are the least of your worries since mould can wreak havoc on walls and wooden materials.


Roof flashing can be done with a variety of materials. The most common choices are metals such as copper. Copper is one of the more popular choices for several reasons. It’s very malleable which allows it to fit any shape you might need for your roof. It’s somewhat durable and it won’t negatively impact your roof’s aesthetic. Not to mention, it’s also naturally resistant to the elements.

Another extremely popular choice is versatile lead flashing. Using lead as a flashing material has a bunch of benefits. It’s remarkably tough and long-lasting. If properly installed, you can expect it to last decades without so much as a scratch. It’s also a great choice for environmentally friendly homeowners. Almost one hundred percent of the material can be safely recycled and reused.


It’s hard to argue against roof flashing and its role in protecting a home. You want to provide your home with the best possible defence from the elements. Roof flashing is an essential part of any roof and having it properly installed is crucial.

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