To address water dripping from the roof of an indoor swimming pool in winter, first inspect the roof and surrounding structure for cracks, leaks, or damaged flashing. Seal gaps with high-quality caulk or weatherproof sealant. Insulate the roof and pipes to prevent condensation caused by temperature differences between the warm pool area and the colder roof. Ensure proper ventilation by installing exhaust fans or dehumidifiers to reduce humidity. If drips originate from the pool equipment, repair or replace malfunctioning pumps or heaters. For persistent issues, consult a licensed roofing or waterproofing professional to assess structural integrity and apply advanced solutions like liquid-applied waterproofing membranes.

Water dripping from an indoor swimming pool roof in winter is typically caused by condensation, leaks, or inadequate insulation. Condensation occurs when warm, moist air from the pool (often exceeding 80% humidity) comes into contact with colder roof surfaces, leading to water vapor deposition. According to the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE), indoor pools can generate 10–20 pounds of moisture per day, exacerbating humidity levels. Without proper insulation, thermal bridging can allow heat to escape, further lowering roof temperatures and intensifying condensation. A 2021 study in Applied Energy found that pools without dehumidifiers faced 30–40% higher condensation rates, increasing structural damage risks. Insulating the roof with materials like spray foam (R-value ≥ 6 per inch) reduces heat loss and condensation by up to 60%, as noted by the U.S. Department of Energy. Ventilation systems play a critical role; ASHRAE recommends maintaining indoor pool humidity below 60% through continuous airflow. Leaks in pipes or flashing, common in older structures, can also cause drips. Data from the National Association of Home Builders shows that 15–20% of indoor pool leaks stem from unsealed roof joints. Proactive maintenance, including annual inspections and sealing, can prevent 70–90% of winter-related dripping, reducing repair costs by an average of $1,200–$3,000 annually.