Gutter leaks commonly appear at joints and corners, but movement, poor support, and blocked outlets can keep a patch from lasting. Correct the underlying condition before sealing the joint.

What to check first

  • Inspect supports and joint movement.
  • Clean and dry the repair surface fully.
  • Choose a repair compatible with the gutter metal and any existing coating.

Prepare the joint before sealing it

  1. Check movement and support

    Loose fasteners, separating joints, and deteriorated metal need attention before a liquid repair. Sealant is not a replacement for missing support or a failed attachment.

  2. Identify the bonding surface

    Determine whether you are bonding to bare metal, a factory finish, or an older coating. Remove loose rust and failing material as directed; leave a sound, clean, fully dry surface.

  3. Follow one compatible repair system

    For suitable Turbo Poly Seal seam repairs, embed the specified fleece in the wet base coat and saturate it with the top coat. Screw-head details may use sealant without fleece. Follow the current detail rather than mixing instructions from different products.

From the project archive

Gutters are leave catchers. They should be cleaned almost every week.
Historical project photo · Flat Roof Doctor
Three inch downspout that gets blocked with leaves easily. Bigger downspouts could help alleviate the problem.
Historical project photo · Flat Roof Doctor
During winter gutters freeze. The ice blocks the water from getting to the gutter creating a dam of water on the roof. This will force the water into the roof under the shingles.
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.