Ground firm but permeable to water
For a statically load-bearing substructure on a slope, construction wood with a large span and very good load-bearing capacity is required - around 90 x 90 mm hardwood beams or the Cumaru substructure. These are mounted in concreted-in post shoes or screwed to the foundation with brackets.
The position and number of point foundations depends on the statically possible spans of the construction wood (counter battens and substructure).
Once the positions for the foundations have been clarified, the turf is dug out at right angles, for example 50 x 50 cm, about 0-20 cm in the slope. This creates a level surface on which to build the foundation.
The differences in height due to the slope should be compensated here with the help of the straightedge and spirit level. Masonry cord and sticks in the corners of the foundation area can be helpful. The higher the point, the more must be removed so that the foundation is level in the end.