Roof Trusses

  • Field splices provide a means of connecting two truss sections together creatively at the jobsite, to allow manufacturing, shipping and installation greater flexibility in serving customer needs.
  • A field-spliced truss should be designed as one component so that the proper load transfers at the splice.
  • Correct installation is important to avoid increased deflection of the field-spliced truss and potential long-term serviceability problems.
  • The contractor should examine the trusses when they are delivered and determine if there is any damage that would impair the structural integrity of the trusses.
  • BCSI recommends that trusses stored outside for more than a week be stacked on blocking and have a cover that provides adequate ventilation.
  • The contractor is responsible for the construction means, methods, techniques, sequences, procedures, programs, and safety in connection with the receipt, storage, handling, installation, restraining, and bracing of the trusses. 

 

The March 2012 issue of SBC highlighted the benefits of assembling wood roof trusses on the ground. Here, we see an example using cold-formed steel trusses for a Winco Foods Store in Mesa, AZ. Westco Steel Systems designed the store’s roof so the contractor could build each section on the ground and hoist it into place as a fabricated section.

How do you build a house?

  • The Building Designer providing accurate wall or beam/header information in the Construction Documents is essential in order for the Truss Designer to arrive at the correct bearing width.
  • There are two key bearing related considerations—bearing capacity of the truss and bearing capacity of what the truss is sitting on; often, the bearing capacity of this material is an unknown and an assumption must be made.
  • The options for dealing with insufficient bearing need to be considered and specifically dealt with on a case-by-case basis.