Plywood Wind Bracing - Timber Framing Specification

Timber wall framing must comply with AS1684-1992 National Timber Framing Code or Framing Manuals produced by bona fide timber organisations.

The design racking loads used to establish the standard solution for plywood wind bracing are based on a minimum joint strength group of J4 for unseasoned and JD4 for seasoned framing timbers. Most Australian grown hardwood and softwood framing meets this requirement. If lower joint strength JD5 framing timbers are used, the design racking loads must be reduced by 12.5 percent requiring a proportional increase in the bracing wall length. Some imported softwood timber framing is JD5.

Reference: Plywood Association of Australia brochure "Structural plywood wall bracing"

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Timber Research Unit
Department of Architecture
University of Tasmania