To address water dripping from a PVC ceiling during winter, first inspect for entry points such as loose fixtures, cracked seams, or damaged flashing. Seal gaps with silicone caulk or weatherproof tape. Ensure proper drainage by clearing gutters and downspouts, and install vapor barriers or insulation to prevent condensation. If leaks persist, consult a licensed contractor to assess structural integrity and reinforce vulnerable areas.

Water dripping from PVC ceilings in winter typically stems from condensation or ice dams formed when warm indoor air contacts cold surfaces. PVC, a rigid plastic, can become brittle in freezing temperatures, increasing the risk of cracks that allow water entry. Condensation occurs when humidity exceeds 60%, a common issue in unventilated spaces. According to the U.S. Environmental Protection Agency (EPA), proper insulation reduces condensation by 30–50%. A 2021 ASHRAE study found that thermal bridging in PVC structures can elevate surface temperatures by 15–20°F below adjacent materials, accelerating moisture buildup. Ice dams form when melting snow refreezes along eaves, forcing water into ceiling gaps. The National Weather Service notes that 70% of winter water damage in homes involves ice dams or poor insulation. Addressing these issues requires sealing gaps, enhancing insulation, and ensuring adequate ventilation to maintain indoor humidity below 50%, as recommended by the EPA. Proactive maintenance and adherence to building codes like the International Energy Conservation Code (IECC) are critical to preventing recurring leaks.