What makes a roof a roof? You’re probably thinking of some tiling, the eaves, some proper ventilation, perhaps a chimney? You might be forgetting the important role of roof flashing.
Roof flashing is a critical element of any roof system.
This blog will enlighten you on the different roof flashing types.
We’ll also explore the best practices for installation. You’ll gain insights whether you’re a seasoned roofing contractor or just keen on understanding the essentials of roofing materials.
Understanding Roof Flashing
Roof flashing is a thin material, usually made of metal or rubber.
Its purpose? To direct water away from vulnerable areas of a roof where the roof plane meets a vertical surface, such as:
- Walls
- Chimneys
- Whirlybirds
- Skylights
- Any other protrusions.
Properly installed flashing prevents roof leaks that can lead to structural damage., but the right roof flashing materials are necessary to help the roof last longer, protecting it against the elements in harsh weather conditions.Having the right flashing is a preventative measure that can save you significant costs in the long run since roof repairs can be expensive.
Types of Roof Flashing
There are several different types of roof flashing, and each flashing type is tailored for specific parts of the roof structure. You need special types of flashing to handle water flow and protect your roof material in all areas of the roof. Roof flashing works alongside cement tiles, your metal roof, or any other type of roof you have.
1. Apron Flashing
We use apron flashing at the edges of the roof to ensure water drips away from the deck and into the gutters. You might see this type of flashing called drip edge flashing, since it forces water to drip away from the edge, avoiding the fascia and roof materials directly beneath the roof edge.
2. Valley Flashing
This type of flashing is crucial for the internal angles where two roof planes meet, often referred to as a valley. Valley flashings help direct water smoothly down the sloped roof and into the gutter system, a vital area for preventing water buildup and potential leaks.
3. Chimney and Skylight Flashing
Both chimney flashing and skylight flashing are designed to surround these vertical features. They work by creating a watertight seal that prevents water from entering around these roof penetrations. Step flashing also falls into this category. You layer step flashing with shingles. There’s also counter flashing, which is embedded into the chimney or skylight structure. IN both cases, the idea is to better direct water away from vulnerable points in your roof.
4. Vent Pipe Flashing
We often refer to this simply as pipe flashing. We install it around the base of vent pipes that penetrate the roof. It usually features a rubber seal that conforms to the shape of the pipe, ensuring a tight fit. Again, it should be apparent by now that all of this is an attempt to prevent water leaks, hence the emphasis on tight fits and seals.
5. Wall Flashing
When a roof meets a vertical wall, wall flashing protects the joint where the two planes meet. Varieties include continuous flashing, step flashing, and cap flashing, each designed to address specific junctions between sloped roofs and vertical walls or abutments.
Material Choices for Flashing
The choice of flashing materials plays a significant role in the longevity and effectiveness of the flashing. Most flashing is metal flashing, but there are different metals to choose from:
- Galvanised steel
- Aluminium
- Copper
All three are fairly durable and resistant to corrosion. Copper’s distinction is that it developsa distinctive green patina over years of use, which can add aesthetic value to a building for some people. Galvanised steel flashing has a layer of zinc to prevent rust, which makes it stronger, more long-lasting, and therefore economical. However, it can corrode over time if the zinc layer wears away. Aluminium flashing is a popular choice for many roofing projects since it’s the most lightweight option. This makes it easy to work with.
Installation Insights
Installing roof flashing is not merely about placing the material; it’s about creating a cohesive roofing system that effectively manages water. You need to think of your roofing materials as a whole package designed to:
- Look good
- Ventilate your roof space
- Protect your roof cavity and general structure
Flashing options are critical to number 3. That’s why you need to consider roof flashing, which is a vital component of your roof system and a component you need to install correctly.
Here’s a brief on how to install flashing:
1. Preparation and Measurement
Begin by inspecting the area where you’re going to install flashing. Clean any debris and remove old flashing if it’s a replacement job. Measure the area to ensure the new flashing fits perfectly, reducing the potential for gaps where water could enter.
2. Choose the Right Flashing Material
Select the appropriate material based on the roofing needs and environmental conditions. Don’t hesitate to contact a roofing professional for advice at this stage.
3. Cut and Shape Flashing
Cut the flashing to the required size. Some types may need to be bent or shaped to match the contours of the roof or the structure it is protecting. For example, you must shape valley flashing to fit into the internal angles where two roof planes meet.
4. Secure Flashing in Place
Start by laying the flashing in its place. For step flashing around a chimney or against a vertical wall, each piece should overlap the one below it like shingles, ensuring water is directed away from the wall and back onto the roof.
5. Sea land Waterproof
Apply a waterproof sealant along the edges of the flashing to secure it and prevent water ingress. For counter flashing that protects joints at vertical walls or chimneys, embed the upper portion into the masonry or siding and seal it to create a watertight barrier.
6. Final Checks and Adjustments
Once installed, inspect the flashing for any signs of gaps or potential leak points. Ensure all parts are snugly fitted and sealed. For areas like the roof valley, check that the valley flashing is correctly positioned to channel water smoothly off the roof without pooling.
Key Considerations
Are you planning a roofing project? It’s essential to consider the type of flashing and other factors, such as:
- the slope of the roof
- local climate
- compatibility with existing roofing materials
Each variation can influence the best choice for your circumstances.
Always ensure you install flashing correctly since faulty installation can lead to significant damage and costly repairs. Roofing can be an expensive game when things go wrong.
Summing Up
Understanding the different types of roof flashing and their applications is crucial for anyone involved in the roofing industry. Roof flashings preserve the structural integrity and longevity of your roof.
This is so important in homeownership when maintenance or repairs can put you out of pocket big time. The right flashing installed will save you money and hassle over the long term.
The takeaway? Always consider the role of proper flashing in creating a durable, watertight roof. This holds true for roof repairs and new roofs alike.
You can find a range of roof flashing options at Evobuild that fit your various roofing needs.
Check out:
All four are lead-free flashing options with slight variations depending on your preferences. Contact us today if you’re unsure which is best for your needs. Consulting with experienced roofing professionals can provide tailored solutions that meet specific roofing requirements.
Get your flashing sorted and protect your roof today!