Keep a rain history
Note when the first damp area appears, the side of the building exposed to the rain and how long the storm has been underway. Photograph the interior symptom and the whole opening from safe access. Record whether leakage occurs at the frame, trim, ceiling or wall below. Include previous repairs and whether the symptom changed afterward. This creates a starting point without claiming a diagnosis.
Look beyond the visible joint
The window perimeter is only one part of the opening. Head, sill and jamb details must connect with the wall water-management layers. Nearby stucco cracks, roof transitions and penetrations may also need review when the evidence supports it. Ask what the contractor has ruled in or out and what cannot be established without a closer inspection or a controlled opening.
Preserve intended drainage paths
Do not automatically fill every slot or gap around a frame. Some openings are part of the product drainage system. Follow the window manufacturer’s instructions and have uncertain details reviewed. The Department of Energy’s Building America guidance describes flashing that directs water outward and integration with the surrounding wall. A surface bead cannot substitute for those concealed connections when they are the actual problem.
Agree on the investigation before removal
Ask where testing or an opening is proposed, what it is intended to establish and how finishes will be protected. Controlled testing should follow a planned sequence; uncontrolled spraying can confuse the evidence or introduce more water. Confirm how temporary weather protection will work if removal exposes the opening. Define who approves broader access if the initial findings point elsewhere.
Close the wall only after the correction
A repair proposal should distinguish source correction from drying, substrate replacement, stucco or drywall work and final painting. Ask how the correction will be reviewed and documented before restoration covers it. Include finish boundaries and appearance expectations. If evidence remains incomplete, the written scope should say so rather than promising that a new window or a larger caulk line will solve every leak.
Plan the next step
Send AWC the property address, safe wide and close photos, a short history and the name of the person approving the work. When site verification is needed, AWC offers the $250 Site Evaluation + Written Bid Package, credited toward the project if approved within 30 days. Ask for a written scope that separates observed conditions, assumptions, exclusions and concealed unknowns before authorizing the repair.
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Reference: Building America: windows and doors are fully flashed.