Roof Flashing
Installation and replacement of metal flashings at chimneys, dormers and joints.
Flashings are the leading cause of leaks in aging roofs. At chimney, dormer or wall junctions, we install custom metal flashings that guarantee perfect, lasting waterproofing in any weather.
Problems we solve
- Water infiltrations around the chimney, plumbing vents or walls.
- Flashings lifted, corroded or poorly installed in a previous job.
- Recent shingles but old flashings — weak link in the waterproofing system.
- Chimney re-pointed without replacing the flashings at the same time.
- Targeted repair to avoid a premature full re-roof.
Flashings: the invisible line of defence
Flashings are the metal pieces that waterproof the roof's junctions and transitions: around a chimney, along an adjacent wall, around plumbing vents, in valleys. They're also statistically where the vast majority of roof leaks happen.
Well-designed, well-installed flashings made from the right material can last as long as the roof itself. Poorly installed, they become chronic leak points that eventually cause real damage — not just to the roof, but often to framing and interior ceilings as well.
Custom fabrication, meticulous installation
We fabricate most of our flashings custom, either in the shop or directly on site. That lets us adapt perfectly to every situation: old irregular brick chimneys, walls that aren't quite square, unusual pitches. Prefab standard flashings only work for a fraction of real-world situations — for the rest, custom fab is essential.
We mostly use aluminium and galvanised steel, depending on the context. Aluminium is easier to work and doesn't rust, but galvanised steel is more rigid and better suited for long runs or exposed locations.
The most important thing isn't the material, it's the geometry of the installation. A well-planned flashing sheds water without ever creating pockets or reverse laps, and integrates perfectly with the surrounding shingle courses. It's craftsman's work that demands precision and experience.
Repair or replacement?
In many cases, a failing flashing can be re-sealed and repaired without full replacement. High-quality sealant, a new self-adhesive membrane over the critical areas, and the leak is fixed. That's our first reflex when the situation allows.
In other cases — when the flashing is corroded, deformed or fundamentally badly designed — you have to redo it completely, often as part of a roof replacement. We remove the old flashing, inspect the substrate, and install a new custom-fabricated flashing. The result is durable and clean.
We always diagnose before acting, and we explain clearly why we recommend one approach over another. You have all the info to choose, and the work is warrantied either way.
Why choose Toitures Boulet
- Aluminum or galvanized steel flashings bent on-site for a perfect fit.
- Two-layer method at the chimney: step flashing anchored in the masonry + counter-flashing — the approach that lasts.
- Ice & Water Shield under flashings in critical zones — extra insurance against water.
- High-durability polyurethane sealant, not low-grade silicone.
Our process
From your first call to the final warranty — clear, transparent, no surprises.
- 1
Contact & on-site inspection
We respond to your request within 24 business hours and schedule a free on-site visit to assess your roof and understand your goals.
- 2
Written, itemized estimate
You receive a clear, line-by-line estimate with no hidden fees. It remains valid for 90 days and covers materials, labour, and applicable warranties.
- 3
Project scheduling
Once the estimate is approved, we agree on an approximate date and order materials. We confirm the exact date closer to the work based on weather and current scheduling.
- 4
Professional execution
Our crews work methodically and safely, protect your property with tarps and plywood, and stick to the agreed timeline.
- 5
Cleanup, final inspection & warranty
We sweep every nail with a magnet, do a final walkthrough with you, and issue your warranty documents. Your project is fully complete.
What's included
FAQ
Can flashings be repaired without redoing the roof?+
Yes, in most cases. A targeted flashing repair can resolve a leak without a full replacement.