ROOFING SERVICES · FLASHING AND CURBS
Base flashing repairs, curb enlargements and roof modifications
Most roof leaks start at an edge, so that's where we start.
Base flashing is the membrane that turns up off the roof onto parapets, bulkheads, curbs and equipment supports. Most leaks begin at that turn rather than out in the open middle of the roof. Banu Construction repairs and replaces failed base flashing and patches the roof around it. Where a curb sits too low for the flashing to reach the height it needs, we raise it. We also modify roofs for new openings, equipment and supports. If a modification changes the structure, your engineer designs it and we build to that design.
What we deliver
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The leak traced to its source.
Water tests and probes come before the repair, so the fix lands where the water gets in.
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Flashing at the right height.
We raise curbs wherever new insulation or an old, low curb leaves the flashing too short.
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Repairs that match your roof.
Materials that work with your existing membrane, chosen with any manufacturer's warranty in mind.
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Our own hoisting.
Curb framing, flashing and roofing materials reach the roof by hoist, up to 2,000 pounds a lift, under our own Special Rigger license.
Services and capabilities
01 Investigate
- Leak tracing and water testing
- Core cuts at problem areas to check the insulation and deck
- A survey of the curbs, penetrations and equipment supports
02 Repair and modify
- Base flashing repair and replacement at parapets, bulkheads and curbs
- Roof patching around the repaired flashing
- Curb enlargements, and raised curbs for equipment and hatches
- Pitch pockets and boots at pipes and steel supports
- New roof openings, curbs and supports for equipment (structural steel repairs)
- Counter-flashing and coping at parapets (Local Law 126 parapets)
03 Close out
- A water test once the repair is done
- Photos for your building's files
- Maintenance notes for the roof
Signs your flashing needs work
- Leaks near walls, bulkheads or equipment, rather than mid-roof
- Flashing that has cracked, blistered or started pulling away from the wall
- Curbs so low the flashing barely clears the roof
- Water ponding against curbs and walls
- The same corner patched again and again
- New equipment headed for a roof that wasn't built to carry it
Questions about flashing and curbs
Why do curbs need to be raised?
Base flashing has to rise a minimum height above the finished roof to stay watertight, and roofing manufacturers set that minimum for their warranties. When a new roof adds insulation, the roof surface comes up and the old curbs end up too short. Raising the curb gives the flashing its height back.
Can you repair flashing without replacing the whole roof?
Often, yes, when the rest of the roof is sound. We test before we recommend a fix. If the roof is near the end of its life, we'll say so and lay the repair out next to a replacement, so you can weigh the roof's condition, the warranty options and the disruption to the building.
Do roof modifications need a permit?
New openings and new supports for heavy equipment change the structure, so they need an engineer's design and usually a DOB permit. Like-for-like flashing repairs usually don't. We'll tell you which side of that line your job falls on before work starts.
Let's talk about your building
Leaking at the edges?
Send us photos of the roof, and of the spots inside where the water shows up.
