Leaking could be caused by the lack of flashing installed on the roof.
1. Make sure the flashing is installed in the roof.
2. Make sure the correct termination cap is installed.
3. Ensure everything is install according to the installation manual. https://europeanhome.com/brand/focus-fires/
4. Please contact Technical Support at 781-324-8383 Option 3 or e-mail service@europeanhome.com for further assistance.