If there is any question about how the slope will be supported, perhaps it would make sense to keep options open. When the medial walls are ‘shot,’ it would be a good idea to install 2” PVC sleeves through the walls every 2 feet. This way the a geogrid solution could always be introduced if the anchors end up being impractical or too costly.
Also, sleeves will be needed for electrical conduit and water supply piping.
The sleeves would not constitute ‘weep holes’ since we still have to be concerned about root-protection. See attached sketch.
Any further thoughts after receiving my preliminary flow pattern map for the green roof?
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