Roof Drain Basins: Why the Surrounding Shape Matters

What to check first

• Look for a ridge or dam around the opening.
• Check whether the roof-side connection is intact.
• Have persistent low areas assessed rather than building up more patch material around them.

Separate a leak from a drainage problem

1. Trace the water route

   Follow water from the roof surface through the inlet and toward the discharge point. Inspect normal drainage and any separate overflow provision.

2. Check the waterproof connection

   A sound pipe does not prove the membrane-to-drain connection is sound. Look for loose components, separation, damaged flashing, or patch buildup around the inlet.

3. Preserve the opening

   A compatible local repair must not reduce the effective outlet or cover its strainer. Persistent ponding, backup, or changes to drain location and size need building-specific professional assessment.

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