The answer to 'why is my asphalt shingles leaking' is that there are several common causes, including missing or damaged shingles, improper installation, and aging or worn-out roofing materials. Symptoms of a leaking asphalt shingle roof may include water stains on the ceiling, mold or mildew growth, and visible damage to the shingles themselves.
Some potential solutions include replacing missing or damaged shingles, re-sealing or re-securing loose shingles, and addressing underlying issues like poor ventilation or improper flashing. However, more extensive roof repairs or replacement may be necessary if the roof is older or has significant damage. It's generally best to call a professional roofing contractor to diagnose and address the problem, as improper DIY repairs could make the issue worse.