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A Method for Studying Boron Redistribution and Leaching in Timber Framing

By J A Drysdale, N Marston, M E Hedley, May 2011.

Download Drysdale_IRG42_Queenstown__presentation (pdf)

Executive summary

Presentation from the International Research Group on Wood Protection

  • From 1950’s pine framing was required to be treated to prevent risk from wood borer
  • Boron treatment was dominant
  • Any fungicidal benefit was not recognized in the preservative specification
  • From mid 1990’s there was an industry move to dry untreated framing
  • By 1998 -99 concerns being raised about evidence of decay in buildings
  • From 2001-2003 various reviews and changes were being implemented
  • H1Plus treatments for framing (permethrin & iodocarb)
  • December 2003; new Standards published [NZS3640, NZS3602] and Hazard Class 1.2 recognised
  • H1.2 and H3.1 treatments for timber framing in different applications from 2004 -2011
  • March 14th 2011, the Department of Building & Housing announced H1.2 as single framing hazard classes & all framing (external& internal walls ) & roof trusses to be treated

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