The answer to 'what causes shingle replacement' is that shingles typically need to be replaced when they become damaged, worn, or reach the end of their lifespan. Common causes of shingle replacement include severe weather, age, and improper installation or maintenance.
Over time, shingles can become cracked, curled, or missing due to exposure to UV rays, wind, rain, and other environmental factors. Older shingles that are 15-20 years old or more are more susceptible to damage and may need to be replaced. Improper installation or lack of maintenance can also lead to premature shingle failure and the need for replacement.