Green roof systems cover the roof of a building, partially or completely, with live plants over a waterproof membrane.There is no shortage of companies that do this. Some lay it out as one big garden; others bring up scores of individual flats. Both methods work.
This looks really cool, especially if the roof is accessible and you put a big chess board or some seating up there too. I always assumed, however, that it was probably pretty terrible for the building. On the contrary, I've learned. Like most sustainable building initiatives there are few, if any, down-sides to this.
Highlights:- Reduces heating needs in cooler weather by adding mass and thermal resistance
- Evaporative cooling reduces cooling load on building in warmer weather.
- Increases the life span of the roof by protecting it from weather and UV rays
- Reduces storm water runoff
- Filters air and rain water
- Provides sound insulation
- Creates a wildlife habitat
- Improves the aesthetic environment
Green roof systems also reduce the "heat island" effect in an urban area. This phenomena describes urban temperatures that are two to ten degrees higher than surrounding areas. The two main causes of urban heat islands (UHIs) are the modification of land surfaces by development, and the excess heat created by large buildings. These warmer temperatures have been linked to a variety of problems from residents' health to local weather patterns. Green roof systems help reverse the effect.
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