All,
I did a back-of the-envelope calculation for the geogrid slope stabilization system. Unfortunately, my conclusion is that we cannot support the 45 degree slope using this method. Given the geometry of the roof area, the maximum slope that can be supported, by my estimation, is 25 degrees, or 50% slope. Therefore, fixed anchors, of one sort or another will be necessary.
Refined calculations will result in lower estimates for the pull-out requirements for individual anchors. However, as a practical matter, it makes sense to choose one anchor design. Saving can be achieved by spacing the anchors more widely on mild slopes.
I think that it may be make sense to install the anchors so that the threaded pins project 8 inches. This will make attachment of the tendons for the cellular confinement web easier to do accomplish in the field.
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