Green roofs are designed to allow plants to grow on their surface. They need to be strong enough to hold not only plants but also a layer of substrate for them to grow in, such as soil, sand or rocks.

Low-income favelas would benefit from green roofs but there are two problems: Cost. And a typical design that's too heavy for a favela home.

Using the L-brackets, join together the outer sides of the green roof structure. Measure carefully and use the L-brackets to attach a 2m (6ft 6in) length of wood as a central support through the ...

Blue and green roofs can help combat urban challenges such as stormwater runoff and heat islands and are a small but growing market for geosynthetics.

Above: Two levels of green roofs help keep the house cool in the summer months. Above: The grass on the roofs grows on a ...

Temps soar in Brazil's summer (from December to March). Low-income favelas would benefit from green roofs but there are two problems: Cost. And a... It was a sunny September morning in Rio de ...