| TABLE 24 |
| RECOMMENDED UNIFORM ROOF
LIVE LOADS FOR APA RATED SHEATHING(c) AND APA RATED STURD-I-FLOOR WITH STRENGTH
AXIS PERPENDICULAR TO SUPPORTS(e) |
| Panel Span Rating |
Minimum Panel Thickness
(in.) |
Maximum Span (in.) |
Allowable Live Loads (psf)(d) |
| With Edge Support(a) |
Without Edge Support |
Spacing of Supports
Center-to-Center (in.) |
| 12 |
16 |
20 |
24 |
32 |
40 |
48 |
60 |
| APA RATED SHEATHING(c) |
| 12/0 |
5/16 |
12 |
12 |
30 |
|
|
|
|
|
|
|
| 16/0 |
5/16 |
16 |
16 |
70 |
30 |
|
|
|
|
|
|
| 20/0 |
5/16 |
20 |
20 |
120 |
50 |
30 |
|
|
|
|
|
| 24/0 |
3/8 |
24 |
20(b) |
190 |
100 |
60 |
30 |
|
|
|
|
| 24/16 |
7/16 |
24 |
24 |
190 |
100 |
65 |
40 |
|
|
|
|
| 32/16 |
15/32,1/2 |
32 |
28 |
325 |
180 |
120 |
70 |
30 |
|
|
|
| 40/20 |
19/32,5/8 |
40 |
32 |
- |
305 |
205 |
130 |
60 |
30 |
|
|
| 48/24 |
23/32,3/4 |
48 |
36 |
- |
- |
280 |
175 |
95 |
45 |
35 |
|
| 60/32(g) |
7/8 |
60 |
48 |
- |
- |
- |
305 |
165 |
100 |
70 |
35 |
| APA RATED STURD-I-FLOOR(f) |
| 16 oc |
19/32,5/8 |
24 |
24 |
185 |
100 |
65 |
40 |
|
|
|
|
| 20 oc |
19/32,5/8 |
32 |
32 |
270 |
150 |
100 |
60 |
30 |
|
|
|
| 24 oc |
23/32,3/4 |
48 |
36 |
- |
240 |
160 |
100 |
50 |
30 |
25 |
|
| 32 oc |
7/8 |
48 |
40 |
- |
- |
295 |
185 |
100 |
60 |
40 |
|
| 48 oc |
1-3/32,1-1/8 |
60 |
48 |
- |
- |
- |
290 |
160 |
100 |
65 |
40 |
(a) Tongue-and-groove edges, panel edge clips (one midway
between each support, except two equally spaced between supports 48 inches on center or
greater), lumber blocking, or other. For low slope roofs, see Table 25.
(b) 24 inches for 15/32-inch and 1/2-inch panels.
(c) Includes APA RATED SHEATHING/CEILING DECK.
(d) 10 psf dead load assumed.
(e) Applies to panels 24 inches or wider applied over two
or more spans.
(f) Also applies to C-C Plugged grade plywood.
(g) Check with supplier for availability.
Note: Shaded construction meets Code Plus
recommendations
| TABLE 25 |
| RECOMMENDED MAXIMUM SPANS
FOR APA PANEL ROOF DECKS FOR LOW SLOPE ROOFS(a) (PANEL STRENGTH AXIS PERPENDICULAR TO
SUPPORTS AND CONTINUOUS OVER TWO OR MORE SPANS) |
| Grade |
Minimum Nominal Panel
Thickness (in.) |
Minimum Span Rating |
Maximum Span (in.) |
Panel Clips Per Span (b)
(number) |
| APA RATED SHEATHING |
15/32,1/2 |
32/16 |
24 |
1 |
| 19/32,5/8 |
40/20 |
32 |
1 |
| 23/32,3/4 |
48/24 |
48 |
2 |
| 7/8 |
60/32(c) |
60 |
2 |
(a) Low slope roofs are applicable to built-up, single-ply
and modified bitumen roofing systems. For guaranteed or warranted roofs contact
membrane manufacturer for acceptable deck.
(b) Edge support may also be provided by tongue-and-groove
edges or solid blocking.
(c) Check with supplier for availability. |
APA - The Engineered Wood Association