Green Roof Minimum Slope

The graphic below helps flesh this out.

Green roof minimum slope. Above 10 degrees consider the use of timber frames to help stop the soil from slumping down the roof slope. The minimum roof slope should be no less than 1 60 so that water is positively drained from the roof and does not stay around to find leaks. To support the weight and handle the wear and tear from constant foot traffic the design team specified a beefed up version of a typical green roof system. Generally speaking vegetation blankets can be applied on surfaces with a pitch up to 45.

The greengrid vegetative green roof system is suitable for low slope roof concrete deck plaza applications and other comparable scenarios. A low slope roof is a roof surface with a maximum slope of 2 inches of rise for 12 inches of run 16 degrees as defined in american society for testing and materials standard astm e 1918 97. What is the maximum pitch possible for a green roof with vegetation blankets. About 50 of the roof is at a 2 12 slope providing a fairly comfortable climb for visitors says blau.

If you sketch that out on paper you ll see that a roof angle of 60 degrees requires a very tall north wall or an altered plan for the greenhouse. 0 5 roof angle green roof systems according fll without additional support. 5 15 roof angle systems with optional support depending on project. The steeper the slope the better up to about 10 degrees.