The answer to 'roof vent cracked' is that a cracked roof vent is a common issue that can be caused by a variety of factors, including age, weather damage, or improper installation. Symptoms of a cracked roof vent may include leaks, drafts, or visible cracks or damage to the vent itself.
In many cases, a cracked roof vent can be repaired or replaced by a DIY homeowner. However, for more complex or severe issues, it's best to call in a professional roofing technician to assess the problem and provide the appropriate solution.