40 lbs. Soil Load.  Wall height 8' - 3/4" or 92 1/4" studs.

w = Equivalent-fluid weight of soil, lbs/cu. ft.
W = Total lateral load, lbs/linear foot of wall.
h = Depth of fill (distance from ground level to top of bottom plate), feet.
H = Height of wall (distance from top of bottom plate to bottom of floor joist), feet.
R = Reaction at base of wall (bottom of floor joist), lbs/linear foot of wall.
R1 = Reaction at base of wall (top of bottom plate), lbs/linear foot of wall.
v = Maximum shear, lbs/linear foot of wall.
M = Maximum moment, foot-lbs/linear foot of wall.
x = Location of maximum moment below ground level, feet.
c = Location of W below finish grade.

Backfill measured from finish grade to the bottom of the wall stud.

  Click on drawing to enlarge. 30 lbs. soil.

Note: Panel foundations can be site built or made in a shop. When made so it cover up items that need inspection by the Building Inspector. Third Party Inspection may be required. (inspect for grade stamps, treatment stamps, stud spacing, insulation, nailing, dip of saw cuts, plywood requirments are some of the item that a third party inspection will note.

All Panel Wood Foundations must be designed and installed in accordance with:
All current Building Codes Standards

While wood foundations are easy to build, this is only true if one is building from an accurate well designed plan. When such a plan is incorrect, or if something is left out of the plan or absent, or if a design is made using a guide manual (these are not design manuals); major mistakes can be made during the construction process. These errors cause problems for the owner, builder, and the building department.

Woodbasement.com a service of Permanent Wood Foundation System (PWF), supported by Southern Pine lumber users affiliated with the training and installation of wood foundations.
. .