Apprentice question
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Exterior louver joints need the right sealant joint shape. Remove failed caulk, add backer rod where required, and tool an approved exterior sealant system.
['A perimeter seal is not just a smear of caulk. If the joint is too deep or bonded on three sides, movement and heat can split it open quickly.', 'Clean out failed sealant, install the right backing material where the joint calls for it, then apply the approved exterior-grade sealant with the proper profile. Coordinate with the waterproofing/envelope detail so the sealant works with the flashing, not instead of it.']