How to Narrow Down a Chimney Leak

What to check first

• Record whether the leak occurs in wind-driven rain or ordinary rainfall.
• Compare defects at the crown and joints with defects at the roof line.
• Ask a qualified roofer or masonry specialist to investigate concealed or unsafe areas.

Inspect masonry and roof flashing separately

1. Start above the roof line

   The cap, crown, brickwork, and mortar joints are possible entry paths. A surface coating cannot restore loose masonry or a damaged structural component.

2. Inspect the flashing layers

   Look at the base connection to the roof and the counterflashing that protects it above. Repairing a lower seam will not stop water entering behind an open upper termination.

3. Match the material to the defect

   Use appropriate masonry repairs for failed mortar or crown damage. For a confirmed roof-flashing defect, verify the exposed materials and current product compatibility before applying a reinforced repair.

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