Sloped green roofs are extremely attractive and highly visible from the ground, however they have unique challenges and need to deal with erosion and shear forces due to gravity. The soil or grow media/substrate layer is usually 75 mm due to the retention piece and 4-6" and the entire system has a saturated weight of less than 35 lbs. per square ft. - average being about 50 lbs.per square foot.
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