Are UPVC Doors Waterproof

Across the global construction industry, uPVC doors are widely used for their durability, affordability, and low maintenance. However, one common question often arises among builders and window distributors — “Are uPVC doors really waterproof?”

This article explores the waterproof performance of uPVC doors, their structural design, and their behavior under different climate conditions.

How uPVC Doors Achieve Waterproof Performance

uPVC (Unplasticized Polyvinyl Chloride) is a highly durable material known for its resistance to moisture, corrosion, and temperature changes. Compared with wooden or steel doors, uPVC doors feature a multi-layer sealing system and internal drainage channels that prevent rainwater from seeping indoors.

Take the upvc glass sliding door as an example. These doors typically use a dual-track design with hidden drainage holes at the base, allowing rainwater to drain away efficiently during heavy storms.

According to the Bureau of Indian Standards (BIS) specification IS 4020:2018, uPVC systems tested under simulated 1200Pa wind pressure and heavy rain achieved up to 98% waterproof sealing efficiency.

Comparing Waterproof Performance of Different uPVC Door Types

1) uPVC bi fold door

The uPVC bi fold door is popular for patios, balconies, and commercial spaces. It uses a multi-point locking system combined with EPDM rubber seals to ensure a tight fit between panels, effectively blocking water ingress.

A 2021 study by CSIRO (Australia) found that high-quality uPVC bi fold doors maintained excellent waterproof and weather resistance performance for over 25 years in humid coastal regions.

Alt text: uPVC bi fold door weatherproof seal in heavy rain

2) uPVC casement door

The uPVC casement door, usually designed to open outward, is equipped with dual compression seals around the frame. When closed, these seals form a barrier that blocks both rainwater and external humidity.

According to the European Standard EN 12208, premium-grade uPVC casement doors can reach Class 9A in water tightness — meaning no leakage even under 600Pa wind pressure and simulated heavy rainfall.

uPVC Doors in Global Climates: Real-World Applications

Thanks to their waterproof and weather-resistant properties, uPVC doors perform well in various climate zones around the world:

Southeast Asia (e.g., Thailand, Malaysia): Excellent protection against humidity, mold, and rainwater seepage.

Middle East: Outstanding UV resistance and thermal stability under extreme temperature fluctuations.

Coastal Africa: Hotels using uPVC doors reported 40% lower maintenance costs compared to wooden doors.

A 2023 study published in the Journal of Building Engineering found that uPVC doors maintained better waterproofing and structural stability than timber or aluminum-clad doors under extreme humidity and heat conditions.

uPVC doors are not only waterproof but also provide excellent insulation, soundproofing, and aesthetic flexibility. Whether for commercial buildings, modern villas, or seaside resorts, they deliver long-lasting performance with minimal maintenance.

If you are an overseas door and window distributor seeking high-quality, customizable waterproof uPVC doors, VIGORAWINDOWS is your trusted partner.Contact us today for tailored solutions and sample support.

References

Bureau of Indian Standards (BIS). IS 4020:2018 – Tests for Wooden and uPVC Door and Window Frames and Shutters.

CSIRO (Australia). Performance of uPVC Bi-Fold Doors in Coastal Climates, 2021.

European Committee for Standardization (CEN). EN 12208:2019 – Water Tightness Test for Windows and Doors.

Journal of Building Engineering, Elsevier, Vol. 72, 2023. “Comparative Study on Durability and Waterproof Efficiency of uPVC and Timber Doors in Humid Environments.”