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General Benefits of Green Roofs – Reduction of Urban Heat Island Effect

June 10th, 2020

Green roofs are recognised to have a positive effect on reducing the UHIE (Urban Heat Island Effect).

What Is The Urban Heat Island Effect?

An urban heat island, or UHI, is a metropolitan area that’s a lot warmer than the rural areas surrounding it. Heat is created by energy from all the people, cars, buses and trains in big cities like New York, Paris, and London. Urban heat islands are created in areas like these: places that have lots of activity and lots of people.

There are many reasons for UHIs. When houses, shops, and industrial buildings are constructed close together, it can create a UHI. Building materials are usually very good at insulating or retaining heat. This insulation makes the areas around buildings warmer.

“Waste heat” also contributes to a UHI. People and their tools, such as cars and factories, are always burning off energy, whether they’re jogging, driving, or just living their day-to-day lives. The energy people burn off usually escapes in the form of heat. And if there are a lot of people in one area, that’s a lot of heat.

For more information, please click here.

How Can Green Roofs Help?

A green roof, or rooftop garden, is a vegetative layer grown on a rooftop. Green roofs provide shade and remove heat from the air through evapotranspiration, reducing temperatures of the roof surface and the surrounding air. On hot summer days, the surface temperature of a green roof can be cooler than the air temperature, whereas the surface of a conventional rooftop can be up to 90°F (50°C) warmer.1

Green roofs can be installed on a wide range of buildings, from industrial facilities to private residences. They can be as simple as a 2-inch covering of hardy groundcover or as complex as a fully accessible park complete with trees. Green roofs are becoming popular in the United States, with roughly 8.5 million square feet installed or in progress as of June 2018.2

For more on this story, please click here to visit the United States Environmental Protection Agency article.

Offsetting The Urban Heat Island Effect

Green roofing systems, such as the M-TRAY® green roofing system, can also help to offset the urban heat island effect. Because cities are full of roads, roofs, and parking lots, they tend to absorb a lot of sunlight, making them several degrees warmer than the surrounding country. By putting a green roof in place, you can help to offset this effect and start to cool your city back down again to a more reasonable temperature.

Green roofs can absorb both dust and pollutant gases and also offer water attenuation qualities (up to 50% at 100mm depth). They also cool buildings rather than having the hard surfaces radiate heat out at night. There is also evidence of localised cooling, stormwater reduction, less flooding and more insects and wildlife in urban centres.

Introducing The M-Tray®

Wallbarn presents the new M-Tray® which has been further improved to make sedum roofs easier to install with less disruption to both the plants and the structure. M-Tray® is also designed to give a more seamless, verdant finish and an instant green roof.

Wallbarn is at the forefront of developments in the green roofing sector and has always provided products that combine top-quality ingredients with user-friendly, hassle-free maintenance. The purpose of M-Tray® is to enhance rooftop living

Our bespoke design allows us to supply the best quality vegetation to site. The fully established, mature sedum or wildflower plants, are contained within easy-to-carry trays which click together to form an almost invisible join.
For M-Tray® Enquiries – Call 0208 916 2222 / Email sales@wallbarn.com
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