As the world prepares for World Urbanism Day on 8 August, it’s clear that cities need a new kind of infrastructure—starting with what’s overhead. Rooftops cover up to 40% of urban surface area, yet they remain mostly passive, heat-absorbing, and hydrologically disconnected.
What if we reimagined rooftops as active climate tools?
🔍 From Lid to Living Surface
Urban development has long prioritized impermeability: roads that repel rain, rooftops that trap heat, surfaces that isolate buildings from nature.
The result?
- Roof temperatures that can exceed 70–80 °C during summer peaks
- Lost rainwater, funneled into sewers rather than returned to the atmosphere
- Microclimates that are hotter, drier, and less habitable
We don’t just need rooftops that drain - we need rooftops that retain, cool, and breathe.
🌿 WaterRoofs: Evaporative Infrastructure for the Vertical City
WaterRoofs, invented by Igor Ustinov, is a patented modular roofing system made from recycled PET. Unlike traditional materials that seal off the water cycle, this design actively restores it:
- Tiles interlock seamlessly and are lightweight, making them ideal for both retrofits and new builds
- Each tile features micro-channels that retain rainfall in fine grooves—similar to how forest canopies catch dew
- The stored water then evaporates gradually, cooling the tile and the surrounding air
- Up to 750 L of water per square meter per year is returned to the atmosphere through passive evaporation
The result is a roof that behaves like part of the ecosystem—not just part of a building.
🌆 Climate Benefits in the Urban Core
WaterRoofs aligns perfectly with the goals of compact, resilient cities:
✔ Thermal regulation Rooftop evaporation reduces peak surface and ambient temperatures by 1–5 °C—outperforming passive reflective surfaces, especially during heatwaves.
✔ Water cycle restoration Instead of draining away, rain is slowly cycled back to the atmosphere, improving urban humidity and supporting local precipitation cycles.
✔ Circular, modular design The system uses recycled PET—already found in common waste streams—and can be recovered, reused, and adapted with ease.
🔄 Built for Compact Urbanism
WaterRoofs contributes to the compact city model in key ways:
- Minimal structural load—compatible with both flat and angled roofs
- Quick, scalable installation—perfect for accelerated development timelines
- Circular materiality—diverting plastic from landfills and reintegrating it into architectural purpose
Think of it as planting an invisible, evaporating forest on your rooftop.
📅 Toward World Urbanism Day
As World Urbanism Day approaches, it’s time to look up—and rethink what our cities are made of.
What if every rooftop could:
🌡️ Cool its surroundings?
💧 Restore part of the atmosphere’s lost moisture?
♻️ Be made from the waste materials of yesterday?
The age of passive rooftops is ending. WaterRoofs shows that rooftops can be reimagined—tile by tile—as engines of restoration.
🔗 Explore the future of rooftops: www.waterroofs.com