Installation Instructions

P. 4
Web Stiffener Requirements
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 1.
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 1
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”