The answer to 'why is my ridge vent cracked' is that a cracked ridge vent is often caused by age, weather exposure, or improper installation. Over time, the materials in a ridge vent can become brittle and crack, especially if the vent was not installed correctly or if it has been subjected to extreme weather conditions like high winds, heavy rain, or hail.
Cracked ridge vents can allow water and pests to enter the attic, leading to further damage and potential mold or rot issues. If you notice cracks in your ridge vent, it's important to address the problem promptly to prevent more serious problems.