If not properly secured a pitched vegetated roof can erode and slip under heavy rain excessive irrigation or poor plant growth.
Rain on a slanted roof.
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The minimum pitch for a roof is 1 4 12 which translates to 1 4 inch rise to 12 inches of run.
However you can only use this pitch with built up roofing or specialized synthetic roofing.
The slope of a roof or pitch is determined by how many inches the roof rises over 1 foot or 12 inches.
An example for a steep sloped roof is 8 12.
I always loved the sound of it.
How to redirect rain off a roof.
Do you like this sound.
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.
There are times when it rains especially during big storms that water cascades off of a roof like a waterfall.
This means that the rise of the slope goes up or down 8 inches for every 12 inches.
Rain on the roof window of my own previous house.
To put it in perspective the angle of this slope would be around 30 degrees.
Make sure the roof will stay in place.