Modern cities are turning into concrete jungles, keeping us away from the natural world. To mitigate this, Rooftop terraces are rapidly evolving into green sanctuaries and communal havens. In an age where climate change challenges the very core of urban living, these elevated platforms are emerging as strategic layers in our cities' resilience. From mitigating heat islands to capturing rainwater, rooftop terraces are increasingly recognised as valuable ecological assets. In this article, Ar. Gagandeep Kapila, Founder and Principal Architect at Workshop for Metropolitan Architecture, explores the essence of rooftop terraces and how they help keep the environment clean.
Climate-Resilient Rooftop Design
In cities, the dense concentration of concrete absorbs heat, creating urban heat islands (UHIs). This raises temperatures by several degrees, increases energy use, and poses health risks. Green or reflective rooftop designs can reduce surface temperatures and improve building energy performance.
Climate change has disrupted predictable rainfall patterns, leading to intense downpours that strain drainage systems. Rooftop rain gardens and water harvesting systems can retain or slow runoff, reducing the risk of urban flooding.
Designing for Resilience
One of the simplest yet effective methods involves utilising shading devices and green covers to reduce heat gain. These features can make terraces habitable throughout the year and reduce indoor cooling demands. Furthermore, extensive or intensive green roofs use layers of vegetation and drainage systems to cover rooftops. While extensive green roofs are lightweight and require minimal maintenance, intensive ones support larger plants and sometimes even trees, acting like rooftop parks.
Material Choices in Such Climates
Cool roofing materials reflect more sunlight and absorb less heat. Ceramic tiles or specialised membranes are often used. Permeable paving can allow rainwater to seep through, replenishing groundwater. Recycled and local materials that have low embodied energy or are sourced locally reduce the environmental impact and enhance the sustainability of the project.
Multifunctional Rooftops
With thoughtful landscaping and seating, terraces become social hubs for residents or employees. Incorporating yoga decks, water features, and quiet corners encourages mental well-being. Rooftops can host art installations, murals, or cultural motifs, linking sustainability with local identity.
In essence, rooftops are critical layers in the city’s ecosystem. By transforming them into climate-resilient spaces, we elevate our physical surroundings and elevate our commitment to sustainability, community, and future generations.
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