Students at Delhi University’s Laxmibai College were left stunned when they discovered a classroom wall not freshly plastered with paint or cement, but with cow dung. In a viral video, Principal Dr Pratyush Vatsala, standing on a chair, is seen applying this age-old material to the wall with the help of a staff member.

While the unusual sight has sparked debate, this practice is deeply rooted in traditional knowledge, and there’s more to it than meets the eye. Could this age-old method actually hold scientific merit? The natural properties of cow dung—acting as a binder, insulator, and even possessing antimicrobial qualities— may offer the key to sustainable, climate-conscious living spaces.

For centuries, rural India has used cow dung as an eco-friendly alternative for wall finishes and flooring, creating cool, breathable interiors. But in a world that often prioritises modern construction materials, could this tradition be making a timely comeback?

How cow dung, an ancient Indian practice, is helping homes stay 7°C cooler today

This is not a new concept. For generations in rural India, cow dung was used for plastering walls and floors, offering a natural alternative to concrete and other modern materials. It’s valued not just for being inexpensive and readily available but for its ability to act as an effective insulator. Homes coated with cow dung were cooler in the summer and warmer in the winter — a property that made them ideal for India’s varied climate.

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