Roof flashing protects your home from the elements by preventing water from seeping into vulnerable areas of your roof, like valleys, chimneys, skylights, or roof joints. Often overlooked, choosing the right flashing is essential for maintaining the integrity and longevity of your roof.
Whether you're a DIY enthusiast or working with a professional roofer, understanding the types of flashing, how to choose the right one, and where you can buy it is an important first step.
What Is Roof Flashing?
Roof flashing is a thin material installed around the joints, seams, or any vulnerable area where your roof meets protrusions. Its main job is to stop water from sneaking into your home where different roof parts meet. Without flashing, rainwater can get into the gaps, causing leaks and wood rot.
What Are the Different Types of Roof Flashing?
There are a few different types of flashing, each designed for a specific task. If you want to make sure your roof is well-protected, it's worth knowing the differences…
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Step flashing: Looking like a staircase, step flashing is typically used around chimneys or walls where your roof slopes down. Step flashing is installed in a series of small, overlapping pieces, each directing water away from the seams and into the gutter. It's perfect for pitched roofs.
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Valley flashing: Where two sloped sections meet, valley flashing handles the heavy flow of rainwater that's funnelled down the slopes. This flashing ensures water is directed safely off the roof and doesn't seep into the home.
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Continuous flashing: Also known as apron flashing, this one is a long, continuous piece of flashing that covers areas like the edges of your roof. It prevents water from seeping under the roof where it meets a wall or chimney.
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Roof penetration flashing: This is used around pipes, vents, and skylights to prevent water from getting into your roof. They're especially important for flat roofs, which tend to accumulate more water.
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Counter flashing: This is used on top of step flashing for extra protection. Counter flashing overlaps step flashing and provides an additional layer of defence, especially around chimneys and walls.
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Taped flashing: Modern and easy to install, taped flashing comes with an adhesive backing that sticks to surfaces. It's great for DIY projects and tricky areas where traditional flashing might be tough to install.
How to Choose Roof Flashing
You need to consider a few key factors to make sure you're getting the best option for your roof.
Material Matters
Flashing comes in a range of materials, each with its pros and cons.
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Aluminium: Lightweight, corrosion-resistant, and easy to work with. Perfect for most DIY projects, but it can be prone to damage in extreme weather.
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Copper: A premium choice, copper flashing looks great and can last decades. It's also naturally corrosion-resistant but can be pricier than other materials.
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Steel: Strong and affordable, steel (often galvanised) is great for most Australian homes and can handle a range of weather conditions.
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Zinc: Zinc is long-lasting and corrosion-resistant, and it is excellent for coastal areas because it resists salty air. It's also aesthetically pleasing, though it's more expensive than steel.
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Lead: Once a common choice, lead is now mostly avoided due to environmental concerns. It's also more expensive and has health risks, so it is not often used anymore.
Climate Considerations
Australia's weather can be all over the place, so think about your location. If you're near the coast, go for a material that resists corrosion from salty air (zinc or copper are great options). If you're in a hotter area, aluminium or steel might be better at handling extreme temperatures.
Roof Type
The type of roof you have will influence the kind of flashing you need. For example, flat roofs need a different kind of flashing compared to sloped roofs. Make sure you pick a flashing system that works for your roof’' design.
Durability
Flashing is a long-term investment, so consider how long you want it to last. Copper can last up to 100 years, while aluminium may only last 20-30 years. Think about the lifespan you're aiming for and the materials that best match.
Installation
Some materials and flashing types are easier to install than others. DIY-ers may prefer taped flashing or materials like aluminium, while more complex installations, like copper, might need professional help.
Where to Buy Roof Flashing?
Here are some of the best places to source roof flashing:
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Roofing supply stores are specialty stores for roofing DIY-ers and professionals alike. They carry a wide range of flashing materials and can provide expert advice on what works best for your home. Plus, they usually have all the other roofing supplies you might need.
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Hardware stores, like Bunnings or Mitre 10, often stock basic flashing materials. These places are great if you're looking for a simple solution and want to get your flashing fast. Look up 'Roof flashing Bunnings' to find out what's in stock.
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Custom flashing manufacturers are good if you've got a unique roof design or special requirements. You can always approach a manufacturer to get custom flashing made. They'll make sure it fits your roof perfectly, and you'll be one step ahead in protecting your home.
Final Thoughts on Roof Flashing
Roof flashing may not be the most glamorous part of your home's exterior, but it's one of the most important elements. Choosing the right material and type can make all the difference when it comes to protecting your home from leaks and water damage.
FAQs
How Much Does It Cost to Replace Flashing Around a Roof?
Replacing roof flashing can range anywhere from $200 to $1,000, depending on factors like your roof's size, the flashing material, and the complexity of the job. If you're doing it yourself, you could save a bit on labour costs, but always get a few quotes if you're hiring a pro.
Why Are Lead Flashings No Longer Used for Roofing?
Lead flashings are becoming less popular due to environmental concerns. Lead is toxic, and its disposal can cause environmental damage. Safer and more sustainable options like copper, zinc, and aluminium or lead alternatives are now preferred.
What Type of Flashing Is Best for a Roof?
The best flashing type depends on your roof and location. Copper is excellent for longevity, while galvanised steel is durable, affordable, and suitable for most climates.