Block(s) should be of similar size/grade as the truss member to which it is attached. Blocking should be designed to act as one unit with the truss members.
Block(s) should be of sufficient size to accept all carried/carrying member nails, and develop full seat bearing as specified in Simpson Strong-Tie publications.
Truss Designer is to confirm blocking size/grade, fasteners required and application.
Fasteners used to attach the additional blocking should be independent of the truss hanger fasteners.
1 Use of Wood Blocking to Achieve the Full Design Load Value of a Face Mount Hanger Attached to a Single Ply Carrying (Girder) Member. (Block designed by Engineer of Record or Truss Designer)
2 Connection Design to Achieve Specified Nailing of a Face Mount Hanger at a Panel Point.
Example shown: HGUS210-2 installed on a 2x6 bottom chord (other applications similar)
3
Use of Wood Filler Blocking for Carried Member Width Less than Hanger Width. (Block designed by Designer or Truss Designer)
Example shown: THGBH4 installed
For diagram 2: Nails located in joints formed by the intersection of wood members or with edge or end distances less than suggested by NDS have no load resistance. The hanger allowable load value shall be reduced by the nail shear value for each header nail less than the specified quantity. Connection shall be approved by the Truss Designer.
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