Skylight Curb Flashing on Flat and Sloped Roofs

What to check first

• Identify whether the unit and flashing suit the roof slope.
• Inspect the uphill side for trapped debris.
• Look at the membrane-to-curb transition and all corners.

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.

From the project archive