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ROOFING SERVICES · SKYLIGHTS

Skylight installation and replacement

A skylight is a hole in the roof, so we curb it and flash it like one.

Skylights leak where any roof opening does: at the curb, the flashing and the frame. Banu Construction installs new skylights and replaces failing ones. We build or raise the curb each one sits on and flash it into the roof membrane. The frame then goes on with its skirt lapped over that flashing. Where a new opening is cut, your engineer designs the framing and we build it.

Last reviewed: October 8, 2026

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Skylight curb section at a roof opening Section through the edge of a skylight on a flat roof showing an insulated curb built up at the edge of the framed deck opening, base flashing run from the roof membrane up over a cant and the curb with a termination bar, the skylight frame set on the curb with its counter-flashing skirt lapping down over the base flashing, the sloped insulated glazing held by a cap, and the lined light well below. COUNTER-FLASHING BASE FLASHING ROOF MEMBRANE SKYLIGHT GLAZING SKYLIGHT FRAME CURB ROOF DECK LIGHT WELL DETAIL 26 · SECTION
A skylight on an insulated curb. Base flashing from the roof runs up the curb, and the counter-flashing on the skylight frame laps down over it, so each joint sheds water outward.

What we deliver

  • Curbs flashed like the rest of the roof.

    Base flashing tied into your membrane, with the skylight frame counter-flashing over it.

  • The right curb height.

    New or raised curbs that give the flashing the height it needs above the roof surface.

  • Openings covered while we work.

    Open skylights and new openings stay covered or guarded so no one can fall through.

  • Our own hoist to the roof.

    We lift new frames and glass to the roof ourselves, up to 2,000 pounds a lift, under our own Special Rigger license.

Services and capabilities

01 Survey and plan

  • A survey of the existing skylights, curbs and the framing around them
  • Product data and shop drawings for your architect's review
  • Coordination with your engineer on new openings

02 Install

  • New skylights, and replacements for failed units
  • Insulated curbs, new or raised
  • Base flashing and counter-flashing tied into the roof membrane (base flashing and curbs)
  • Framing for new roof openings, built to your engineer's design
  • Finish work inside the light well

03 Close out

  • A water test on each installed skylight
  • Photos of the curb and flashing before they're closed up
  • Maintenance notes for the glazing seals and flashing

Signs a skylight needs work

  • Drips or stains on the ceiling around the skylight
  • Condensation running down the inside
  • Glazing that has cracked, clouded over or yellowed
  • Rusted or rotted curbs
  • Flashing patched over and over at the same skylight
  • Old wired glass or plastic domes you're ready to replace

Questions about skylights

Should we repair or replace a leaking skylight?

If the unit itself is sound and the leak is at the flashing, re-flashing the curb solves it. If the frame or glazing is failing, or the condensation never lets up, a new insulated unit is usually the better call. We water-test first and show you what we found.

Can you add a skylight where there isn't one?

Yes. Your engineer designs the new opening and its framing, and your architect or engineer usually files for a DOB permit. We build the opening and the curb, flash the curb into the roof and set the skylight.

Can skylights be replaced in winter?

Yes. We work one skylight at a time and close or cover the opening the same day. Roofing materials have temperature limits, so the flashing work gets scheduled around the weather.

Related

Let's talk about your building

Leaking skylight?

Send us photos from the roof and from inside. We'll tell you whether the problem is the flashing or the unit.

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info@banuconstruction.com