Do not smear exterior silicone over a multi-section louver joint and call the water path fixed.
Check
Track where water enters and where it exits.
Check for missing vertical gutter, splice channel, or butyl sealant.
Make sure the sill pan/weep path is open.
Confirm whether the joint needs movement clearance.
Water-test only after the internal drainage path is corrected.
Steps
Track where water enters and where it exits.
Check for missing vertical gutter, splice channel, or butyl sealant.
Make sure the sill pan/weep path is open.
Confirm whether the joint needs movement clearance.
Water-test only after the internal drainage path is corrected.
Say this to your foreman
The multi-section louver at [location] leaks down the vertical splice. I checked the face and sill path. Do you want the internal gutter/splice channel opened and corrected?