Why does silicone on the outside not fix a leaking louver splice?

Field answer

Water can migrate through the joint between louver sections. If the joint is supposed to have an internal gutter or splice channel, smearing silicone on the outside can trap water or fail after movement.

Open the inside joint if accessible, check for missing gutter/splice parts, and rebuild the joint so water is captured and routed to the sill/weeps. Use the approved sealant inside the joint, not as a cosmetic band-aid on the face.

What to check first

• 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.

Why it matters

The water may still run behind the face seal and drip onto equipment or interior finishes.

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Final direction belongs to the foreman, approved drawings/specs, manufacturer instructions, pressure/material schedule, employer policy, and AHJ/code requirements.