Technical Specifications

P. 23
FIGURE 7
(
CONTINUED
)
Typical P3 Joist Roof Framing and Construction Details
All nails shown in the details below are assumed to be common nails unless otherwise noted� 10d box nails
(0�128 x 3”) may be substituted for 8d common (0�131 x 2-1/2”) as shown in details� Individual components are
not shown to scale for clarity�
Slope Spans for Roofs
Slope Factor and Depth Factor Table
Slope 2�5:12 3:12 3�5:12 4:12 4�5:12 5:12 6:12 7:12 8:12 9:12 10:12 11:12 12:12
Slope Factor 1�021 1�031 1�042 1�054 1�068 1�083 1�118 1�158 1�202 1�250 1�302 1�357 1�414
Depth
Factor
9-1/2” 2” 2-3/8” 2-7/8” 3-1/4” 3-5/8” 4” 4-3/4” 5-5/8” 6-3/8” 7-1/4” 8” 8-3/4” 9-1/2”
11-7/8” 2-1/2” 3” 3-1/2” 4” 4-1/2” 5” 6” 7” 8” 9” 10” 11” 11-7/8”
14” 3” 3-1/2” 4-1/8” 4-3/4” 5-1/4” 5-7/8” 7” 8-1/4” 9-3/8” 10-1/2” 11-3/4” 12-7/8” 14”
16” 3-3/8” 4” 4-3/4” 5-3/8” 6” 6-3/4” 8” 9-3/8” 10-3/4” 12” 13-3/8” 14-3/4” 16”
18” 3-3/4” 4-1/2” 5-1/4” 6” 6-3/4” 7-1/2” 9” 10-1/2” 12” 13-1/2” 15” 16-1/2” 18”
20” 4-1/4” 5” 5-7/8” 6-3/4” 7-1/2” 8-3/8” 10” 11-3/4” 13-3/8” 15” 16-3/4” 18-3/8” 20”
22” 4-5/8” 5-1/2” 6-1/2” 7-3/8” 8-1/4” 9-1/4” 11” 12-7/8” 14-3/4” 16-1/2” 18-3/8” 20-1/4” 22”
24” 5” 6” 7” 8” 9” 10” 12” 14” 16” 18” 20” 22” 24”
7r
7s
LUMBER OVERHANG WITH BEVELED PLATE
P3 JOIST OVERHANG FOR FASCIA SUPPORT WITH BIRDSMOUTH CUT
4’-0”
min
2’
-0”
max
2’-0”
max
2’-0”
ma
x
Blocking panel or x-bridging not shown for clarity
Bearing stiffener required each side
2x4 overhang attached to web of P3 Joist
with 1row of 8d nails at 8” o�c� clinched
Blocking panel Attach per 7j or x-bridging
(Validate use of x-bridging with local building code�
See 7v for vent holes�)
Attach per 7a
8d nails at 6” o�c� clinched
2x block for fascia support
2x filler
Attach per 7h
8d nails at 6” o�c�
Birdsmouth cut at bearing
2x4 min� beveled bearing
block cut to fit
NOTE Additional connection may be required for wind uplift�
Lumber overhang shall be 2x4 Spruce-Pine-Fir #2 or better
ora stronger species�
NOTE Additional connection may be required for wind uplift�
L = horizontal length
L x slope factor (SF)
L x SF + depth factor
depth facto
r
PJI