Stucco structural problems can be caused by a wide variety of factors, including man-made disturbances, weather issues, and natural wear and tear. The following are some of the most likely culprits:
Foundation settlement. When the soil beneath the house compresses or is washed away by floods or heavy rainstorms, it can lead to foundation settlement. This can cause vertical cracks in foundation walls and exterior stucco.
Water infiltration. If water permeates the home’s structure (such as through excessive water around the home’s foundation), it can gradually deteriorate the lath and other material behind the stucco, resulting in cracks.
Weather circumstances. While stucco is considered a weather-repellent siding, wind, heavy rains, and humidity can weaken the material over time.
Vibrations. The external vibrations from nearby construction sites or heavy traffic can lead to cracks in stucco siding as well.