A skylight has several potential leak paths: glazing seals, frame joints, curb flashing, and the surrounding roof. Repairing the wrong layer can hide evidence while water continues entering elsewhere.

What to check first

  • Check cracks and seals around the glazing.
  • Inspect flashing at all four curb corners.
  • Compare repair with replacement when the unit itself is deteriorated.

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 Skylight Repair Guide: Diagnose the Leak FirstOpens on YouTube ↗

From the project archive

Skylight leaking – How to make repairs
Historical project photo · Flat Roof Doctor
Skylight Leak Repair Flat Roofs
Historical project photo · Flat Roof Doctor
Skylights, the problem of every flat roof. Repairing flashing
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.