Framework theoretical

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Some European countries, including Germany, Switzerland, Holland, Hungary, Sweden and the UK, have associations promoting ceilings verdes.8 The city of Linz in Austria pays builders to install green roofs. In Switzerland there is a federal law on green roofs. Britain began slowly but policies on this issue have become very effective, especially in London and Sheffield.

Combat heat island effect [edit]

It is another important building roofs verdes.9 Traditional buildings absorb solar radiation and then emitted as heat ratio, making cities have higher temperatures than surrounding areas at least 4 ° C. On the roof of City Hall in Chicago the temperature in very hot days is usually 1.4 to 4.4 ° C lower than that of traditional buildings circundantes.

Considerations

Green roofs are more structural, especially intensive. Some existing buildings can not be modified because not support the weight of soil and vegetation. Maintenance costs may be higher depending on the type of roof. Also of importance is the waterproofing: install adequate proof raincoat roots may increase the cost of installation.

Construction

Green roofs incorporated under the ground an antirraíces geotextile sheet to prevent leakage of sand can clog drains and to prevent plant roots can damage the lower elements of construction. Panels also typically incorporate nodes, which have button-shaped reliefs which can dam up a small amount of water. Thus, plants can access the reservation in dry seasons. Under these sheets thermal insulation (usually rigid panels) to support the weight of the soil and plants without deforming and waterproofing layer of the building is locate