Field Repairs & Alterations

The repair and modification of metal plate connected wood trusses can be a very complicated subject, because each situation must be analyzed individually. This Research Report will give an overview of the fundamental principles behind truss repair that inform the truss designer’s approach in all truss scenarios.

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Ever have one of those component jobs where everything went exactly to plan, only to have a hiccup at the last moment? 

  • 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.
  • Be proactive and develop a plan to strategize how you might deal with a truss collapse and the subsequent investigation.
  • Information is critical; visit the site, take lots of photos and document as much as you can.
  • Remember that the only company looking out for your company’s best interests is your own. Take action with this in mind, and ultimately, it will save everyone money and time.
  • Plywood and OSB design values are given; those that are doing repairs in your office should have a good feel for the similarities and differences.
  • Plywood and OSB generally have similar design properties with a key exception of fastener strength where plywood will require more fasteners to be used.
  • If a truss repair specifies only OSB, plywood should not be substituted without written permission from the registered design professional who prepared the truss repair design drawing.