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An intensive
green roof is usually specified when the green roof goals are
aesthetic, versus simply economic, in nature. An intensive green
roof allows for a wider variety of plants, including shrubs
and trees, and requires a deeper growth media which will increase
weight and structural requirements.
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Because of the increased depth, larger plants, including shrubs
and trees can be incorporated in the plantings. The maintenance
requirements are more demanding and an irrigation system is
often specified.
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