Wood, like other structural materials, exhibits an inherent variability in strength properties from piece to piece.
The design value is obtained by reducing the fifth percentile test result by a property reduction factor.
The grading of lumber is not an exact science; a reasonable amount of discrepancy is to be expected between individual pieces graded by different graders.
Cross-cutting stress-graded lumber into pieces shorter than the original piece is a common practice wherever lumber is used in construction.
Several testing stations were built inside of SBCRI since it opened in June 2007.
Measuring the flow of loads through individual components and within a building system has been defined as the approach to most SBCRI industry testing.
Preliminary industry testing projects have been conducted on roof trusses and wall panels.
WTCA’s newest chapter is made up of Canadian manufacturers and their suppliers.
While legislation and building code interpretations differ, trusses and wall panels are designed and manufactured similarly in both the U.S. and Canada.
Many Canada Chapter members see the benefits of leveraging the programs and work already created by WTCA.
The chapter’s first project is creating English/French versions of the BCSI documents, which currently exist in an English/Spanish format.