Green roofs lower surface temperatures often by 50 degrees fahrenheit or more.
Low pitch green roof.
It is the task of the designer to make adjustments in the green roof system accordingly e g.
The most crucial component of any sloped green roof is the confinement system which holds the growth medium in place during the roof s early stages of development.
Converting your roof to green offers many benefits to a homeowner from energy savings to expanding natural habitat.
In retrofit projects a sub framing system is attached to the existing flat roof surface to provide a minimum 12 roof pitch.
Even a flat roof should have some pitch so that it sheds water toward gutters.
Drainage thickness of growing media plant varieties etc.
Most vegetation will grow on quite sever slopes but the designer must consider the practicalities of installing the green roof and just as importantly how the roof is to be maintained.
Sloped roofs retain less water in general and the moisture content varies from the ridge to the eave lowest edge of the roof.
Above 5 degrees roofs are considered to have a pitch which may affect the design.
Moreover low slope metal roofs are not prone to the degradation experienced by organic materials enabling these roofs to better resist the elements.