Green Roof Design Criteria

The two basic types of green roof systems extensive and intensive are differentiated mainly by the cost depth of growing medium and the choice of plants.

Green roof design criteria. Additional standards under development include performance standards for the multiple functions of growing media. Working in close partnership with spri design guidelines approved by the american national standards institute ansi have been developed for fire wind uplift and root repellency. Green roofs can be limited by the additional weight of the fully saturated soil and plants in terms of the physical capacity of the roof to bear structural loads. Criteria of a successful green roof project study.

Low weight low capital cost low plant diversity and minimal maintenance requirements. Green roofs consist of a series of layers that create an environment suitable for plant growth without damaging the underlying roof system. Design criteria green roofs typically consist of layers which are designed to support plant growth and retain water for plant uptake while preventing ponding on the roof surface. Extensive green roofs are often not accessible and are characterized by.

The green roof system. The roofs are designed so that water drains vertically through the media and then horizontally along a waterproofing layer towards the outlet. Completes thorough a project study of every installation to determine the most appropriate. Green roof design criteria structural capacity of the roof.