Installation

  • Use of galvanized box nails may result in shear walls with a shear capacity significantly below the nominal unit shear capacities given in SDPWS.
  • Thus, the majority of WSP shear walls have a shear capacity with a high degree of design value variability. This may have unintended consequences that are unknown and unappreciated by the professional engineering and/or building design community.
  • Once SBCA and SBCRI were certain their testing and engineering analysis was consistent and repeatable, they were persistent in bringing all WSP shear wall performance issues to the attention of APA, AWC, ICC-ES and ICC.  
  • 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.

If you do a web search for current trends in U.S. urban planning, article after article will discuss similar issues. Urban planners face new challenges as a result of the recent economic downturn, and subsequent sluggish growth. A few examples include: a higher percentage of renters over owners due to foreclosures and defaults; delayed housing purchases by Generation Y; a growing desire for alternative transportation choices and shorter commutes; all coupled with a decreasing availability of urban land.

In case you ever needed a picture to define the importance of diagonal bracing in the context of lateral restraint (i.e., top chord purlins as well), these photos of long span trusses say it all.

  • Hoisting trusses is a more dangerous practice than most people think; both individual trusses and bundles of trusses should not be lifted at the peak.
  • The recommended industry best practices for hoisting truss bundles are a bit different than those for single trusses, but the same basic concepts apply.
  • BCSI and CFSBCSI outline industry best practices for hoisting 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?

Congratulations to Truss Systems Hawaii, Inc. whose photo received the most votes in SBC’s Online Photo Contest. 

  • Sending a Jobsite Package with each truss delivery is a good way to share safe installation and bracing recommendations with framers.
  • In the near future, SBCA is committed using SBCRI testing to optimize BCSI guidelines.
  • We hope to change bracing design by combining temporary and permanent bracing into one step.
  • Information about installation tolerances can be found in the B1 Summary Sheet.