When it comes to building or renovating a home in a high-humidity environment—think tropical coasts, monsoon-prone cities, or even places with frequent fog and rain—the question of material durability becomes front and center. One of the most popular choices for modern window framing today is uPVC (unplasticized polyvinyl chloride). Promoted for its weather resistance, low maintenance, and thermal insulation, uPVC has become a favorite among homeowners and builders alike.