A wall crack is an observation, not a diagnosis. Its appearance alone cannot establish that the framing is rotten or that exterior replacement is necessary. Note when it appeared, whether it is changing, and whether nearby doors, windows, or finishes have also changed.
Make a useful record
Photograph the crack with a ruler for scale and keep dated photos from the same viewpoint. Record nearby stains or leaks and whether they follow rain or snowmelt. Share earlier repair records if the area has been patched before.
Inspect the relevant building components
If water entry is suspected, an exterior inspection can examine the nearby roof, siding, window, or flashing. Ask which findings support the proposed repair and whether further evaluation of concealed areas is needed. A structural concern may require a qualified structural professional beyond an exterior repair inspection.
Respond to an unsafe condition
Keep away from sagging ceilings, falling materials, or areas showing sudden movement. If you believe a collapse is possible, leave the affected area and contact emergency services. For a nonemergency exterior concern, request an inspection and describe what has changed.
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