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=Description=
=Description=
[[Green roofs]] are composed of several layers (waterproof membrane or existing membrane, root barrier, drainage layer, filter fabric, growing medium) that support the growth of plants and other vegetation on top of a roof.
=Types=
=Types=
There are two main types of green roof systems: extensive and intensive.
#Extensive green roofs have growing medium depths of 10 cm to 15 cm (0.1 to 0.15 m), maximum structural weight loads of 250 kg/m<sup>2
=Component description=
=Component description=