This stage is the most important. If this is not done properly, the risks are subsidence, structural defects emerging post-construction, and erosion.
We dug a 800mm deep trench approximately 500mm wide (NB. the hand-drawn diagrams mention 6ft, but this is completely over the top). This trench should be slightly wider than a bag in order to give enough work space. The depth of the trench depends on the soil structure, which in our case was clayey soil; we probably went a bit overboard, but we wanted to lay gravel for drainage and be able to comfortably fit three bags up to grade (i.e. ground level).
We neglected to take any photographs of this stage, but it’s hardly rocket science (and the hand-drawn pictures are pretty self-explanatory anyway). Just dig a ditch, make sure it’s level, and ensure you have adequate drainage by using lots gravel.
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