π° "Cooling green roofs seemed like an impossible dream for Brazil's favelas. Not true!"
π "And it was cheap. Because of the bidim and the vinyl sheets used as waterproof screening (as opposed to the traditional asphalt blanket), Cassiano's green roofs cost just 5 Brazilian reais, or $1, per square foot. A conventional green roof can cost as much as 53 Brazilian reais, or $11, for the same amount of space."
https://www.npr.org/sections/goats-and-soda/2025/01/25/g-s1-28783/brazil-health-heat-garden-roof


