Minimum Nailing Requirements for Web Stiffeners – US

Web stiffeners are required:

  • When sides of the hangers do not laterally brace the top flange of each P3 Joist;
  • When P3 Joist are designed to support concentrated loads greater than 1580 lbs. that are applied to the P3 Joist’s 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.

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.

Web stiffeners may be supplied by the distributor for field installation or maybe cut in the field as required.

 

Stiffener Size and Nailing Requirement
Joist Depth 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)