When you think of roof protection, the first things that spring to mind are shingles, thermal insulation and attic ventilation. But there’s another, more discreet but just as essential component that deserves special attention: flashing. This small element, often made of galvanized metal, aluminum or elastomeric membrane, is installed at critical roof junctions, where the risk of water infiltration is greatest. They can be found around chimneys, skylights, ventilation outlets and where roof slopes meet.
What is flashing and what is it used for?
Flashing is a protective material, often made of aluminum, galvanized steel or elastomeric membrane, which is installed at roof junctions to prevent water infiltration. It is placed where shingles or other coverings are insufficient to ensure a complete watertight seal, such as at the base of chimneys, around vents, or where a roof meets a vertical wall.
Without adequate flashing, rainwater can easily seep through small openings or cracks, causing structural damage, mold or premature deterioration of materials. Over time, these infiltrations can compromise the integrity of the building envelope.
Signs of damaged flashing
Like any roofing component, flashing can wear or shift over time, due to weathering, freeze-thaw cycles or natural building movement. Poorly fastened, rusted or cracked flashing is a direct entry point for moisture.
Here are a few warning signs:
- Water stains on interior walls or ceilings.
- Visible traces of rust on the edges of the roof.
- Mould or damp odours in the attic.
- Visible displacement of flashing near chimneys or dormers.
Regular inspections of these areas can detect problems before they cause major damage.
When should flashing be replaced or repaired?
Flashing does not require frequent maintenance, but it is essential to inspect it during any roof repair or renovation. If you’re replacing your roofing, it’s the ideal time to check the condition of the flashings and replace them if necessary. Even if your roof is still in good condition, a damaged flashing alone can compromise the building’s watertight integrity.
In some cases, a simple repair may suffice: re-sealing joints, fixing displaced sections, or applying a sealant. But if the metal is rusted or the membrane torn, a complete replacement is recommended.
A small detail, a big impact
Flashings are one of those invisible components that make all the difference between a roof that lasts and one that leaks. Their installation requires precision and expertise. It’s not enough to simply install them: they must be well sealed and perfectly adapted to the roof’s configuration. Calling on an experienced roofer in Laval ensures that flashings will be installed or repaired according to standards, with the right materials and without compromising on quality.
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