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Permanent
Wood Foundation Wood Basement Floor System and Concrete
Floor.
Concrete
slab basement floors shall be designed in accordance
with requirements of the building code having jurisdiction,
but shall be not less than 3 inches in thickness.
Concrete floor must be up on basement wall studs 1"
min.
Wood basement floors shall be designed to withstand
axial forces and bending moments resulting from lateral
soil pressure at the base of the exterior foundation
walls and floor live and dead loads.
R1 = inward reaction at base of wall, pounds per linear
foot of wall.
SYP #2 Studs = Design value for compression perpendicular
to grain (bearing) psi.
R1 is the
load at the bottom of the wall, R1 shall be resisted
by providing adequate bearing area of the stud on the
concrete or wood floor system.
Table
1.
For
8'- 0" Wall Height.
(92 1/4" Stud Size)
| SYP
#2 |
Concrete
and Wood Floors - Wall Bearing Against Floor System
(R1 Reaction) |
35
lbs.
equivalent
fluid weigh
of soil
for 8'-0" walls |
Backfill
(in") |
6"
o.c.
Studs |
8"
o.c.
Studs |
12"
o.c.
Studs |
16"
o.c.
Studs |
24""
o.c.
Studs |
R1
Reaction |
| 36 |
.12" |
.16" |
.24 |
.32" |
.48" |
137 |
| 42 |
.16" |
.21" |
.32" |
.42" |
.64" |
183 |
| 48 |
.20" |
.27" |
.41" |
.54" |
.82" |
233 |
| 54 |
.25" |
.33" |
.50" |
.67 |
1.01" |
287 |
| 60 |
.30" |
.40" |
.60" |
.81" |
1.21" |
346 |
| 66 |
.35" |
.47" |
.71" |
.95" |
1.43" |
408 |
| 72 |
.41" |
.55" |
.83" |
1.10" |
1.66" |
472 |
| 78 |
.47" |
.63" |
.94" |
1.26" |
1.89" |
539 |
| 84 |
.53" |
.71" |
1.06" |
1.42" |
2.13" |
607 |
| 90 |
.59" |
.79" |
1.19" |
1.58" |
2.38" |
676 |
Table
2.
For
9'- 0" Wall Height.
(103 1/2" Stud Size)
| SYP
#2 |
Concrete
and Wood Floors - Wall Bearing Against Floor System
(R1 Reaction) |
35
lbs.
equivalent
fluid weigh
of soil
for 9'-0" walls |
Backfill
(in") |
6"
o.c.
Studs |
8"
o.c.
Studs |
12"
o.c.
Studs |
16"
o.c.
Studs |
24""
o.c.
Studs |
R1
Reaction |
| 36 |
.12" |
.16" |
.24 |
.32" |
.49" |
140 |
| 42 |
.16" |
.21" |
.32" |
.43" |
.65" |
186 |
| 48 |
.21" |
.28" |
.42" |
.56" |
.84" |
238 |
| 54 |
.26" |
.34" |
.52" |
.69" |
1.04" |
295 |
| 60 |
.31" |
.41" |
.62" |
.83" |
1.25" |
356 |
| 66 |
.37" |
.49" |
.74" |
.98" |
1.48" |
421 |
| 72 |
.43" |
.57" |
.86" |
1.15" |
1.72" |
490 |
| 78 |
.49" |
.65" |
.98" |
1.31" |
1.97" |
561 |
| 84 |
.55" |
.74" |
1.11" |
1.49" |
2.23" |
635 |
| 90 |
.62" |
.83" |
1.25" |
1.66" |
2.50" |
710 |
Table
3.
For
10'- 0" Wall Height.
(115 1/2" Stud Size)
| SYP
#2 |
Concrete
and Wood Floors - Wall Bearing Against Floor System
(R1 Reaction) |
35
lbs.
equivalent
fluid weigh
of soil
for 10'-0" walls |
Backfill
(in") |
6"
o.c.
Studs |
8"
o.c.
Studs |
12"
o.c.
Studs |
16"
o.c.
Studs |
24""
o.c.
Studs |
R1
Reaction |
| 36 |
.12" |
.16" |
.24 |
.33" |
.49" |
141 |
| 42 |
.16" |
.22" |
.33" |
.44" |
.66" |
189 |
| 48 |
.21" |
.28" |
.42" |
.56" |
.85" |
242 |
| 54 |
.26" |
.35" |
.53" |
.70 |
1.06" |
301 |
| 60 |
.32" |
.42" |
.64" |
.85" |
1.28" |
364 |
| 66 |
.38" |
.50" |
.76" |
1.01" |
1.52" |
432 |
| 72 |
.44" |
.59" |
.88" |
1.18" |
1.77" |
504 |
| 78 |
.50" |
.67" |
1.01" |
1.35" |
2.03" |
579 |
| 84 |
.57" |
.77" |
1.15" |
1.54" |
2.31" |
657 |
| 90 |
.65" |
.86" |
1.30" |
1.73" |
2.60" |
738 |
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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Official Web
Site for the Permanent Wood Foundation System
