In hot climates, conventional dark-colored roofs can absorb a significant amount of solar radiation, leading to a significant increase in roof surface temperature during the daytime. This heat accumulation not only accelerates the aging of waterproofing membranes but also increases cooling demand and overall energy consumption of the building.

To improve roof performance under such conditions, waterproofing membrane systems with reflective or heat-reducing surface properties are increasingly used across a wide range of building types, including residential buildings, commercial complexes, industrial facilities, warehouses, and logistics centers.

What Is a Cool Roof?

A cool roof is a roof system designed to reflect more sunlight and absorb less heat than conventional roofing surfaces. It is a performance characteristic that can be achieved through appropriate surface materials and system design.

Key performance indicators typically include:

• Solar Reflectance

• Thermal Emittance

• Solar Reflectance Index (SRI)

The higher the solar reflectance, the more solar energy is reflected away from the roof surface, helping to reduce roof temperatures and improve overall building energy efficiency.

A Cool Roof Solution with Easier Installation

To translate cool roof principles into practical applications, roofing systems need to deliver both thermal performance and reliable waterproofing under real construction and service conditions. This requires materials that are not only reflective, but also durable, safe to install, and suitable for long-term exposed use.

Based on these requirements, OYH’s YHCoolRoof membrane series has been developed to provide a practical cool roof waterproofing solution for different building types and project conditions.

Key advantages include:

Reliable Waterproofing with Long-Term Durability

Designed for long-term exposed use, YHCoolRoof membranes deliver durable waterproofing without additional protection layers. Enhanced anti-aging performance ensures resistance to UV, heat, and weathering.

Lower Roof Temperatures and Improved Sustainability

The reflective surface reduces solar heat absorption and can lower roof temperatures by 20–30°C in summer, helping reduce cooling energy demand and improve building sustainability.

Lightweight System for New Construction and Renovation

No protective layer is required, reducing roof load and simplifying system design for both new construction and refurbishment of concrete and metal roofs.

Safe and Efficient Installation

Self-adhered, torch-free application improves site safety and enables faster, more efficient installation, especially in high-temperature conditions.

Advanced Surface Protection

Fluoropolymer surface technology provides strong resistance to UV, acid rain, and weathering, helping maintain long-term appearance and performance.

Choosing the Right Cool Roof Membrane

How the YHCoolRoof System Is Built

The YHCoolRoof system is a simple and efficient roofing assembly designed to combine waterproofing and cool roof performance. It provides a direct-applied solution without the need for complex additional layers.

The system typically consists of the following key components:

1. Roof Deck

2. YHPEfilm-0600 Vapor Impermeable Film

3. OYH XPS insulation board

4. Protective Screed

5. YHBituprimer Water-based Bituminous Primer

6. YHCoolRoof Exposed Self-adhesive Waterproofing Membrane

7. Chamfer

   
   

Conclusion

Cool roof systems are an effective approach to reducing solar heat gain on buildings by improving roof surface reflectivity and thermal performance. When properly designed, they help lower roof temperatures, reduce cooling energy demand, and improve overall building sustainability.

Based on this principle, OYH has developed the YHCoolRoof membrane series, which integrates reliable waterproofing performance with practical cool roof benefits in a single exposed system. It provides a durable and efficient solution for modern roofing applications across different building types and climates.