Cool Roofing: A Scalable Solution for Climate Resilience

India Battles Heatwaves: Cool Roofs Emerge as a Weapon

India is reeling from unprecedented heatwaves, with temperatures exceeding 50°C in some cities. While the world grapples with climate change, adapting to harsher realities is crucial. Cool roofs, a technology reflecting heat from rooftops, offer a promising solution.

The Problem: Heatwaves and Rising AC Use

This year's heatwave highlights the dangers of climate change. With rising temperatures, air conditioners (ACs) become essential, but their increased use leads to more energy consumption and emissions, creating a vicious cycle.

The Solution: Cool Roofs for Comfort and Sustainability

Cool roofs combat heat by reflecting sunlight, keeping buildings cooler. This reduces the need for ACs, leading to lower energy bills and reduced emissions.

Traditional and Modern Methods of Cool Roofs

Traditionally, whitewashing with lime and chalk was used for heat reduction. Today, various options exist, including:

• Heat insulation tiles

• Modified bitumen membranes

• Gravel roofs

• Cool roof paints

Cool Roof Policies and Effectiveness

The Indian government acknowledges the importance of cool roofs. Telangana launched India's first cool roof policy in 2023, mandating them for specific buildings.

Measuring Cool Roof Performance

Three metrics determine a cool roof's effectiveness:

• Solar reflectance index (SRI): Measures heat absorption compared to a black surface (0-100 scale).

• Reflectance: Ability to reflect light (black = low, white = high).

• Emittance: Ability to release heat (black and white surfaces are similar).

Cool Roof Paints: A Promising Option

Cool roof paints, like those used in the new Parliament building, are gaining popularity due to their ease of use and effectiveness. Studies show they can significantly reduce roof and ambient temperatures.

Benefits Beyond Cooling

Cool roofs offer a multitude of benefits:

• Increased thermal comfort

• Reduced energy consumption

• Lower greenhouse gas emissions

• Reduced urban heat island effect

• Potential for increased solar panel efficiency

• Lower wear and tear on building materials

The Time to Act is Now

With India's rapid urbanization, growing AC use, and burgeoning rooftop solar sector, cool roofs are a timely solution. By adopting them widely, India can combat heatwaves, mitigate climate change, and create a more sustainable future.

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