The answer to 'why is my skylight algae growth' is that algae growth on skylights is a common issue caused by a combination of moisture, sunlight, and environmental factors. Skylights are prone to algae buildup due to their exposure to the elements and the warm, humid conditions that can promote algae growth.
Some common causes of skylight algae include condensation buildup, poor ventilation, and excessive moisture from nearby trees or landscaping. Over time, this algae can discolor the skylight, reduce its transparency, and even compromise the structural integrity of the skylight if left untreated.