A dome skylight can leak at the gasket or frame even when its roof flashing is sound. Inspect the glazing connection separately so that a roof patch does not conceal a failed seal higher up.

What to check first

  • Check the gasket and frame for deterioration.
  • Keep intended drainage or weep paths open.
  • Confirm whether the glazing is glass or plastic before using a cleaner or sealant.

Identify which part of the skylight leaks

  1. Separate unit problems from roof problems

    Check the glazing, gasket, frame, curb, and membrane connection as distinct details. Interior condensation can also produce moisture without a roof leak.

  2. Protect the glazing and drainage paths

    Do not cover weep openings. Verify whether the glazing is glass or plastic before choosing a cleaner or product; aggressive solvents can damage some plastics.

  3. Choose a compatible repair or replacement

    Turbo Poly Seal must not be applied directly to glass. Bergstrom identifies Super Silicone Seal for suitable glass repairs. A damaged frame or glazing unit may require replacement rather than another patch.

Watch the field examples

These archive demonstrations show individual projects. Use the current guidance above and Bergstrom’s published instructions if an older video shows a different product or method. Torch work shown in installation videos is professional work.

Watch Dome Skylight Gasket Leaks: Inspect the Frame as Well as the Roof · example 1Opens on YouTube ↗Watch Dome Skylight Gasket Leaks: Inspect the Frame as Well as the Roof · example 2Opens on YouTube ↗Watch Dome Skylight Gasket Leaks: Inspect the Frame as Well as the Roof · example 3Opens on YouTube ↗

From the project archive

Curb Mount Skylights - These skylights are designed for flat roofs
Historical project photo · Flat Roof Doctor
Dome-skylight - these skylight prevent water pooling and snow build-up on them
Historical project photo · Flat Roof Doctor
Curb mount skylight specs - All flat roof skylights should have the proper specs
Historical project photo · Flat Roof Doctor

Product reference: Bergstrom Industries’ published knowledge catalog. Follow the latest product label and safety information. Historical project examples are educational and are not a specification for every roof.