Technical Specifications

P. 13
Minimum Nailing Requirements for Web Stiffeners
Stiffener Size and Nailing Requirement
1� Web stiffeners are required:
• When sides of the hangers do not laterally brace the top flange of each
P3 Joist;
• When P3 Joists are designed to support concentrated loads greater than
1580 lbs� that are applied to the P3 Joists top flange between supports�
In these applications only, the gap between the web stiffener and the
flange shall be at the bottom flange;
• For all engineered applications with end-reactions greater than 1580lbs�
A design analysis must be performed for all engineered applications
with end-reactions greater than 1580 lbs.
2� When used at end bearings, install web stiffeners tightly against the bottom flange
of the P3 Joist� Leave a minimum 1/8” gap between the top of the stiffener and
the bottom of the top flange� See Figure 2�
3� Web stiffeners may be supplied by the distributor for field installation or may be
cut in the field as required�
Joist Dept
2-1/2” Wide Flange
8d (2-1/2”) nails
3-1/2” Wide Flange
10d (3”) nails
9-1/2” 4 -
11-7/8” 4 4
14” 4 4
16” 4 4
18” - 6
20” - 6
22” - 8
24” - 8
Minimum
Stiffener
1” x 2-5/16”
(width)
1-1/2” x 2-5/16”
(width)
Web Stiffener Installation Details
FIGURE 2
Gap
Tight Joint
No Gap
CONCENTRATED LOAD
(Load stiffener)
END BEARING
(Bearing stiffener)
Approx.
2”
Approx.
2”
See table above for web
stiffener size and nailing
requirements.
1/8”-1/4”
Gap
Tight Joint
No Gap
Gap
No Gap
(4) 2-1/2” nails,
for all depths of
PJI 40 & 60
3” nails required
fo
r 3-1/2” flange
(PJI 80 & 90)
Flange width
greater than
1-3/4”