While the basic components of a sloped green roof are similar to that of a flat system building teams must pay particular attention to water management erosion control.
Green roof minimum slope.
Drainage thickness of growing media plant varieties etc.
It is the task of the designer to make adjustments in the green roof system accordingly e g.
Green roof systems of this type are drained by a multi layer fabric mat called a drainage mat that combines soil separation drainage and protection functions.
It is uncommon to find a roof below 15 but for those very low pitch applications there are interlocking clay pantiles available suitable for use down to 12 5.
To put it in perspective the angle of this slope would be around 30 degrees.
Sloped roofs retain less water in general and the moisture content varies from the ridge to the eave lowest edge of the roof.
With regards to metal roofing the profile refers to the shape adopted by the metal sheets when they are bent to form the panels.
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As the popularity of vegetated roofs grows in the u s building teams are finding new methods for greening rooftops.
To get the minimum pitch for a metal roof the vertical rise per foot is divided by the horizontal slope.
The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
The profile refers to the shape the metal sheets take when they bend to.
An example for a steep sloped roof is 8 12.
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However you can only use this pitch with built up roofing or specialized synthetic roofing.
The minimum roof slope for metal roofs is dependent upon the roof profile.
Manufacture must be listed in nrca s low slope roofing materials guide.
Expanded polystyrene eps insulation that is used in a roofing system must be a minimum of a 1 25lb per square foot density and it must be compatible with the surrounding roofing products.
A recent trend is to adapt green roof technology for low and steep slope applications.
Systems with drainage mats.
The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.
This means that the rise of the slope goes up or down 8 inches for every 12 inches.
Minimum pitch for metal roof.
Traditionally a minimum roof pitch of 20 was recommended in bs 5534 but modern tiles and slates have now been designed for applications as low as 15.
The minimum slope for standing seam of roof systems shall be one quarter unit vertical in 12 units horizontal 2 percent slope.
Low slope manufacturer requirements 1.
