|
30-pcf
equivalent soil weight.
Maximum
Backfill Height For PWF Basement Sheathing (in.) *
From bottom of stud to top of backfill height.
Warning! Plywood
installed Face Grain Parallel to Studs may not be strong
enough Check Span Table.
* Based
on 30-pcf equivalent soil weight, and 1190 bending stress,
modified for permanent duration of load.
Note: Run plywood sheathing Face Grain Across
Studs when possible.
Plywood
Thickness
(in.) |
C-D
EXP 1
Face Grain Across Studs
|
Structural
1 C-D
Face Grain Across Studs |
C-D
EXP 1
Face Grain Along Studs |
Structural
1 C-D
Face Grain Along Studs |
Stud
Spacing
= 12 in. |
3
Span |
2
Span |
3
Span |
2
Span |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
60 |
49 |
76 |
62 |
18 |
15 |
21 |
18 |
| 15/32" |
82 |
67 |
106 |
86 |
26 |
22 |
47 |
39 |
|
4-ply
|
|
|
|
|
36 |
30 |
|
|
|
5-ply
|
|
|
|
|
42 |
35 |
|
|
|
19/32"
|
141 |
114 |
162 |
131 |
38 |
32 |
92 |
75 |
|
4-ply
|
|
|
|
|
44 |
36 |
|
|
|
5-ply
|
|
|
|
|
65 |
53 |
|
|
| 23/32" |
183 |
148 |
202 |
163 |
89 |
72 |
113 |
91 |
Stud
Spacing
=16 in. |
3
Span |
2
Span |
3
Span |
2
Span |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
37 |
30 |
45 |
37 |
13 |
11 |
15 |
13 |
| 15/32" |
49 |
40 |
62 |
51 |
17 |
15 |
29 |
25 |
|
4-ply
|
|
|
|
|
23 |
19 |
|
|
|
5-ply
|
|
|
|
|
26 |
22 |
|
|
| 19/32" |
82 |
67 |
94 |
76 |
24 |
21 |
54 |
45 |
|
4-ply
|
|
|
|
|
27 |
23 |
|
|
|
5-ply
|
|
|
|
|
39 |
32 |
|
|
| 23/32 |
106 |
86 |
116 |
94 |
53 |
43 |
66 |
54 |
Stud
Spacing
= 24 in. |
3
Span |
2
Span |
3
Span |
2
Span |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
20 |
17 |
23 |
20 |
9 |
8 |
10 |
9 |
| 15/32" |
25 |
21 |
31 |
26 |
11 |
10 |
16 |
14 |
|
4-ply
|
|
|
|
|
13 |
12 |
|
|
|
5-ply
|
|
|
|
|
15 |
13 |
|
|
| 19/32" |
40 |
33 |
45 |
37 |
14 |
12 |
27 |
23 |
|
4-ply
|
|
|
|
|
15 |
14 |
|
|
|
5-ply
|
|
|
|
|
21 |
18 |
|
|
| 23/32 |
50 |
41 |
55 |
45 |
27 |
23 |
33 |
27 |
40-pcf
equivalent soil weight.
* Based
on 40-pcf equivalent soil weight, and 1190 bending stress,
modified for permanent duration of load.
Note: Run plywood sheathing Face Grain Across Studs
when possible.
Plywood
Thickness
(in.) |
C-D
EXP 1
Face Grain Across Studs
|
C-D
EXP 1
Face Grain Along Studs |
Stud
Spacing
= 12 in. |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
46 |
38 |
14 |
13 |
| 15/32" |
63 |
51 |
21 |
18 |
|
19/32"
|
107
|
87 |
32 |
25 |
| 23/32" |
138 |
112 |
68 |
55 |
Stud
Spacing
=16 in. |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
28 |
24 |
10 |
10 |
| 15/32" |
38 |
31 |
14 |
12 |
| 19/32" |
63 |
51 |
19 |
16 |
| 23/32 |
80 |
65 |
40 |
34 |
Stud
Spacing
= 24 in. |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
16 |
14 |
8 |
8 |
| 15/32" |
20 |
17 |
9 |
9 |
| 19/32" |
31 |
26 |
12 |
10 |
| 23/32 |
39 |
32 |
21 |
18 |
50-pcf
equivalent soil weight.
Based on
50-pcf equivalent soil weight, and 1190 bending stress,
modified for permanent duration of load.
Note: Run plywood sheathing Face Grain Across Studs.
Plywood
Thickness
(in.) |
C-D
EXP 1
Face Grain Across Studs
|
C-D
EXP 1
Face Grain Along Studs |
Stud
Spacing
= 12 in. |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
|
|
|
|
| 15/32" |
51 |
42 |
|
|
|
19/32"
|
|
|
|
|
| 23/32" |
|
|
|
|
Stud
Spacing
=16 in. |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
|
|
|
|
| 15/32" |
31 |
26 |
|
|
| 19/32" |
|
|
|
|
| 23/32 |
|
|
|
|
Stud
Spacing
= 24 in. |
3
Span |
2
Span |
3
Span |
2
Span |
| 3/8" |
|
|
|
|
| 15/32" |
17 |
15 |
|
|
| 19/32" |
|
|
|
|
| 23/32 |
|
|
|
|
60-pcf
equivalent soil weight.
Only
run plywood sheathing Face Grain Across Studs.
*
Based on 60-pcf equivalent soil weight, and 1190 bending
stress, modified for permanent duration of load.
Note: Run plywood sheathing Face Grain Across
Studs when possible.
Plywood
Thickness
(in.) |
C-D
EXP 1
Face Grain Across Studs
|
Stud
Spacing
= 12 in. |
3
Span |
2
Span |
| 3/8" |
|
|
| 15/32" |
44 |
36 |
|
19/32"
|
|
|
| 23/32" |
|
|
Stud
Spacing
=16 in. |
3
Span |
2
Span |
| 3/8" |
|
|
| 15/32" |
27 |
23 |
| 19/32" |
|
|
| 23/32 |
|
|
Stud
Spacing
= 24 in. |
3
Span |
2
Span |
| 3/8" |
|
|
| 15/32" |
15 |
13 |
| 19/32" |
|
|
| 23/32 |
|
|
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.
.
.
|
Official Web
Site for the Permanent Wood Foundation System
