The answer to 'asphalt shingles leaking' is that the most common causes are damaged or worn shingles, improper installation, and issues with the roof's underlayment or flashing. Symptoms may include water stains, mold growth, and visible cracks or holes in the shingles. Solutions can range from simple DIY repairs like replacing a few damaged shingles to more extensive work like re-roofing the entire home, depending on the extent of the damage.
For minor leaks or isolated issues, homeowners may be able to DIY repairs like sealing cracks or replacing shingles. However, if the leak is widespread, the roof is older, or the damage is severe, it's best to call in a professional roofing contractor. They can properly inspect the roof, identify the root cause, and provide a long-term solution to stop the leaks and prevent further damage.