Get to Know More about Roof Flashing

In order to avoid leaks, it is essential to carry out roof flashing, a term frequently used within the construction industry, particularly among professionals responsible for the house's exterior. 

Multiple flashings are typically installed for each construction project on a building's exterior. But why is this necessary? Let's delve deeper into the topic of roof flashing in the upcoming discussion!

What is Roof Flashing?

Flashing is a construction material employed to protect homes from the possibility of leaks. 

Flashing is installed beneath the connection point between the ceiling and the roof, creating a seal to protect both residential and commercial roofs from potential water damage.

Flashing is necessary because roofs and the sides of homes are particularly vulnerable to potential leaks and other water-related damage. 

The effectiveness of flashing in preventing leaks is influenced by its core material, which is galvalume. The galvalume production process involves applying layers of aluminum, zinc, and silicon to lightweight steel. 

This combination of materials acts as a safeguard against rust-inducing oxidation, ensuring the steel remains corrosion-resistant. Additionally, specially designed roof flashing is waterproof, heat-resistant, and capable of withstanding excessive pressure.

Exploring Three Types of Flashing

There are three distinct categories of flashing, each defined by its placement location: external and internal. External flashing finds its home in exposed areas, such as the intersection of walls and roofs. 

Conversely, internal flashing resides in concealed spaces, strategically positioned to capture infiltrating water on walls and redirect it outward through drainage pathways. To delve deeper into the world of roof flashing, let's delve into the details below.

• Roof Flashing

Roof flashing, crafted from materials like galvanized steel or other metals such as copper, aluminum, and stainless steel, finds its purpose atop roofs to thwart the ingress of water through gaps. 

The primary function of roof flashing is to channel rainwater toward the gutter system, preventing ponding and seepage on the roof. 

This particular flashing variant installs at various key points, commencing from the roof's eaves, progressing to the junction between the roof and ceiling, and culminating at the house's ventilation system.

Now, let's examine each installation location individually!

• Roof and Wall Intersection

If your home features a roof that connects directly to a wall, there's a potential for water to find its way inside. Therefore, it's recommended to install flashing at the point where the roof meets the wall. 

• Valley

Roofs with a sloping valley-like design or those with two sloping surfaces meeting at a single point require the installation of valley-shaped flashing. 

This installation serves the purpose of ensuring water flows smoothly without seeping into the gutter system.

• Chimney

Flashing installation around chimneys is also essential, covering every gap or roof surface near the chimney.

• Skylight

Transparent roof sections like skylights pose another risk of water leakage through gaps. Installing flashing on each side or gap of the skylight will optimize its effectiveness.

• Drip Edges

Flashing should also be placed along the roof's edges because this is where water is most likely to trickle into the house. Therefore, installing flashing at the roof's edge directs water downward. 

• Kickout

Roof flashing installation can be carried out at the roof's edge, where it directly meets the wall, allowing water to flow into the gutter or the silicone water barrier.

• Window Flashing

In addition to roof flashing, this type is equally important because there is a significant risk of water seeping through window gaps. 

Hence, to avoid water infiltration during heavy rain, it's a good idea to install flashing at the upper and side areas of your windows with openings.

Installing window flashing not only safeguards your home's walls from rain leaks but also provides protection against rain driven by strong winds. Window flashing offers three material choices to cater to your preferences:

• Metal Window Flashing

This type of flashing comprises thin metal sheets. What sets metal window flashing apart is its versatility, allowing you to tailor it to your room's specific requirements.

You can install it at the upper part of your windows, creating a compact canopy-like structure that enables water to flow directly away from the window sides, thus preventing any leakage into the gaps of your home's windows.

• Vinyl Window Flashing

Vinyl is commonly recognized as a flooring material. Flashing made from vinyl requires prior shaping before installation.

Once shaped, it can be affixed to the lower edge openings of the window or the window sill. This type also offers a relatively budget-friendly installation cost.

• Window Flashing Tape

The newest iteration of flashing, window flashing tape, is a flexible membrane material capable of self-adhesion due to its high flexibility.

Typically available in roll form, this flashing tape is applied to the frame to secure the window in place.

• Deck Flashing

When installing a deck or terrace, it's advisable to add flashing for double protection.

Deck flashing is similar to window flashing, allowing you to choose from various materials such as metal, stainless steel, or vinyl for your installation.    

How to Install Roof Flashing Correctly

To ensure the roof flashing functions at its best, it's essential to understand the proper installation process. This way, the flashing can effectively protect your home from the risk of leaks.

When you want to install roof flashing, you can follow these four essential steps. Here's an explanation of each one:

• Roof Cleaning

Start by thoroughly cleaning the roof, removing dust and debris. Fill any roof gaps with cement or plaster. If using a roof coating, ensure the area is completely dry before applying flashing.

• Roof Flashing Installation

On a clean roof, firmly secure the flashing in place, ensuring a tight fit without gaps. Once you're confident the flashing is perfectly installed on the roof, you can move on to the next step.

• Installing Roof Flashing Edges

Attach the edge sections of the roof flashing using screws and bolts, paying attention to every corner for a snug fit. Seal any remaining gaps with sealant.

• Testing Roof Flashing

After proper installation, conduct a water test by spraying water over the flashing. No leaks indicate a perfect installation. 

You can test it by spraying water onto the flashing. If there are no leaks, it means the roof flashing has been installed perfectly.

Upon learning about roof flashing, we hope you've gained new insights into safeguarding your home from leaks. Tailor the flashing material and installation location to your needs for optimal performance!

References:

https://kpssteel.com/atap/flashing-atap-adalah-apa-saja-jenis-kegunaanya/ 

https://www.gnetindonesia.com/blogs/fungsi-flashing-pada-atap-rumah 

https://atap.or.id/flashing-atap-adalah/