If you find yourself working on a project that requires roof repairs or a complete replacement, you might be wondering if the metal flashing also needs to be replaced. In this article, we’ll be discussing if and when roof flashing needs to be replaced, as well as explaining how.
While well-installed metal flashing typically lasts a few decades before needing to be replaced (check out this article for more information), there are a few situations where it may need to be replaced early…
- Roofing works: In some cases where roofing works are taking place, the flashing may need to be temporarily removed, or replaced for the job to be done correctly and/or efficiently. It may sometimes seem unnecessary to replace flashing before its time, but doing so may benefit the integrity of the roof.
- Damage: If you find your roof has been damaged due to a storm or some other unprecedented event, replacing the flashing may be necessary in order to prevent leaking and damp. Even if the damage isn’t strictly focused on the metal flashing, it may still have had an impact on its effectiveness.
- Leaks: If your home is experiencing leaks, the metal flashing may need to be replaced to fix the problem
Are Roofers Supposed to Replace Metal Flashing?
When putting on a new roof or doing repairs, roofers usually choose to replace the old flashing. But sometimes, if the flashing is still in good shape, they’ll choose to reinstall it. This not only lets them double-check that it’s done right, but it can also help keep costs down for the client. It’s a win-win if the flashing is still up to the job!
How Long Does Roof Flashing Last?
When installed correctly and looked after, metal flashing on roofs can last up to 30 years. This lifespan however, is determined by various factors:
- Where you live and environmental conditions.
- The materials used.
- Competency of the builder(s) that installed the roof.
- Damage over time.
Can You Reuse Roof Flashing?
If you’re working with roof flashing and it comes off in good shape, it can be reused! You might be able to reinstall it on the same roof once the job’s done, or even use it on a different project – of course, with the client’s approval first. But before reusing any flashing, it’s super important to give it a good inspection. Look for any signs of wear and tear or issues that could cause problems down the road.
That said, most guidelines recommend replacing flashing whenever you can. The idea is to make sure it works as well as it’s supposed to and keeps everything nice and waterproof. It’s all about ensuring the flashing stays in top shape and does its job properly.
How Do You Replace Roof Flashing?
Below you’ll find three handy guides to replacing roof flashing. Please bear in mind, this is just a guide and that installation may differ based on the materials used.
Step Flashing
- Place the kick-out flashing on the base of the roof, making sure it’s snug against the wall. Once you’ve found the perfect spot, briefly remove the piece and apply roofing cement where it will sit.
- Next, put the first piece of step flashing over the end of the starter strip, ensuring it leads directly to the kick-out flashing. Use roofing cement and two nails to secure it to the roof deck.
- Once the kick flashing and first piece of step flashing are secure, apply a shingle. Apply sealant to the base of the flashing, then lay a shingle on top of the flashing and nail it down as usual.
- Repeat to finish the whole course.
Counter-Flashing
If the property has a chimney, counter-flashing will need to be installed.
- Ensure the flashing at the chimney’s base has been installed correctly. If there is no base flashing, first install the step flashing up the side of the chimney.
- Cut an indent into the chimney with a diamond bit saw/diamond grinder disc, and hang the counter-flashing.
- Insert the counter-flashing to the indent. Be sure that it hangs so that it overlaps with the base flashing by at least 2 inches.
- Use roofing cement to secure the counter-flashing to the base flashing and the chimney.
- Seal the indent with roofing caulking, so the counter-flashing hangs securely.
Plumbing Vent Boot Flashing
- Install shingles as normal up to the base of the plumbing vent.
- Place the flashing or boot onto the plumbing vent, so the base is resting on shingles. Lift the boot and apply sealant to hold the flashing in place.
- Firmly push the flashing back down into place.
- Install the next course of shingles. When you reach the plumbing vent, allow the shingles to overlap the top of the flashing.
- To make room for the vent, cut out a circular piece of the shingles.
- To secure the circular edge of the shingle, apply roofing cement beneath it.
Metal Flashing at Kladworx
Here at Kladworx, we hold a range of aluminum metal flashing to help you defend your eaves, windows, doors, and decking against water damage. Our metal flashing can be purchased in a variety of sizes, shapes and colors, as well as bespoke profiles to perfectly fit your project. But that’s not all, we also stock aluminium wall coping to further prevent water damage to the property.
Need a little guidance? No problem! Get in touch with us today, and we’ll help you find the perfect solution for your build. We offer tailored advice and, for those based in London or the South East, we can arrange a site survey to make sure you’re getting the right materials for the job. Let’s make your project a success!
