We start by laying a huge sheet of geo-texile material under the overall pad, then at every stair level there is geo-grid that knits the entire stair together. It created the equivalent strength of a solid poured concrete block. every part of the stairs are tied together with these grid materials.
The black sheet in the last picture is waterproofing membrane because we are bringing up the stairs beyond the stucco. We would never pack earth against any house without waterproofing it first.
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