The useful answer starts with timing and pathway
Windows depend on layered laps, head flashing and sill drainage. Surface sealant cannot replace a broken route behind the cladding.
Best first comparison
Document when the symptom begins, what condition preceded it and where the first visible or measurable change occurs.
Before deciding on a repair
Compare at least one credible alternative cause and choose a check that can separate the two without creating new damage.
Observe→Compare triggers→Repair source→Verify outcome
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