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Green roof

green roof n.

A roof that is covered with plants, particularly one in which special
membranes and other layers serve to protect the rooftop and hold the
plants and soil in place. Also: green rooftop.
--green-roof adj.

Example Citations
Green roofs serve three major benefits to the city, said David
Reynolds, first deputy commissioner for Chicago's Department of
Environment. They help manage storm water by soaking up rain that
would otherwise go into the sewer system. They absorb carbon from the
air, and they reduce the urban heat island effect.
--Pamela Dittmer McKuen, "Installing green roofs can benefit the
environment--and budgets," Chicago Tribune, May 21, 2004

Green-roof technology refers to a complex system of root-repellant
and waterproof membranes, lightweight growing media, drainage layers
and plants which rest directly on the rooftops. It does not include
potted plants. The benefits include savings on energy for heating and
cooling, decreased roof maintenance, sound insulation and aesthetic
appeal. These benefits are greatest in the summer and most
cost-effective in buildings with high air-conditioning costs.

Although considered a new concept in Canada, green roofs have been
used extensively in Europe for more than a decade. More than 10
percent of flat roofs in Germany contain green-roof infrastructure.
--"Green Roofs Qualify for Government of Canada Energy Efficiency
Funding," Canada Newswire, May 12, 2004

A green roof is also called a "living roof" (1993) or an "eco-roof"

Earliest Citation
Living on the edge of a marshland with plants sprouting from his
roof, Maarten Regenboog could well be considered a guinea pig in yet
another Dutch social experiment. Instead he sees himself as a happy
resident of a community of the future. ...

Truly 'Green' Roof

The sod roof took some getting used to, he admits, but helps keep the
top floor warm in winter and cool under the summer sun. It looks kind
of hairy, with the sod bearing short, thick-leaf plants.
--Marlise Simons, "Earth-Friendly Dutch Homes Use Sod and Science,"
The New York Times, March 7, 1994

On the Web

See Also
green accounting:

green bullet:


SEA street:

Subject Categories
Culture - Housing and Architecture:

Science - Environment:

Words About Words
The true call of the desert, of the mountains, or the sea, is their
silence -- free of the networks of dead speech.
--Freya Stark, English traveller and writer, _Perseus in the Wind_,

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Copyright (c) 2004 Paul McFedries and Logophilia Limited
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