The answer to 'underlayment leaking' is that a leaking underlayment is a common roofing issue that can have several potential causes. Underlayment is the water-resistant barrier installed beneath the roof's shingles or tiles, and it plays a critical role in protecting your home from water damage. If the underlayment is leaking, it can lead to costly water intrusion and structural damage.
Some common causes of underlayment leaks include improper installation, age and deterioration, punctures or tears, and poor roof ventilation. Symptoms may include water stains on the ceiling, damp insulation in the attic, and visible signs of moisture intrusion. To address a leaking underlayment, you may need to repair or replace sections of the underlayment, seal any gaps or holes, or in some cases, completely re-roof your home. In many cases, it's best to call in a professional roofing contractor to properly diagnose and fix the issue.