Floor Joist To Wall Connections.

Minimum fastener requirements for typical connection between floor joists and foundation wall framing at various backfill depths are given in Table 1, 2 and 3.
When joists are parallel to the wall and height of backfill exceeds four feet, additional blocking must be placed in the first, second and sometimes third joist spaces at 24" o.c. intervals.
Special Subfloor to end wall connection: Table 4 is one alternative to transfer end wall soil pressure direct from the end wall top plate into the plywood floor.  Longer wall studs are needed than for sidewalls, and smaller floor blocking is used.  Minimum nailing between subfloor and the top plate is given in Table 4.
Joist and Blocking nailed with 3 - 8d box nails per joist and blocking to wall  when a framing anchors is not required.  The table will show a (0) if a framing anchors is not required.

Joist hanger nailing total per hanger,  nailed to wall plate.
Angle nailing total per flange of angle,  nailed to wall plate and to joist or blocking.

Table 1.
Floor to Wall Connections
8' - 0" Walls

Based on 35 pcf equivalent-fluid weight soil pressure and dry lumber.  Untreated top plate spf #2.
Toe- nails driven at angle of approximately 30 degrees with the piece and started approximately one-third the length of the nail from the end or edge of the piece.
Box wire steel nails in untreated lumber or hot-dipped zinc coated steel nails in treated lumber.
Framing anchors shall be joist hanger or joist angles and a minimum load capacity of  the backfill pressure.

Table 2.
Floor to Wall Connections
9' - 0" Walls

Based on 35 pcf equivalent-fluid weight soil pressure and dry lumber.  Untreated top plate spf #2.
Toe- nails driven at angle of approximately 30 degrees with the piece and started approximately one-third the length of the nail from the end or edge of the piece.
Box wire steel nails in untreated lumber or hot-dipped zinc coated steel nails in treated lumber.
Framing anchors shall be joist hanger or joist angles and a minimum load capacity of  the backfill pressure.

Table 3.
Floor to Wall Connections
10' - 0" Walls

Based on 35 pcf equivalent-fluid weight soil pressure and dry lumber.  Untreated top plate spf #2.
Toe- nails driven at angle of approximately 30 degrees with the piece and started approximately one-third the length of the nail from the end or edge of the piece.
Box wire steel nails in untreated lumber or hot-dipped zinc coated steel nails in treated lumber.
Framing anchors shall be joist hanger or joist angles and a minimum load capacity of  the backfill pressure.

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.
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