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Durability of boron-treated radiata

By By Mick Hedley, Dave Page, Jackie van der Waals, Kourosh Nasheri and Gavin Durbin, Scion, Rotorua, April 2009.

Download B111-36Durability (pdf)

Executive summary

An independent trial of boron-treated radiata framing found that the treatment was still working against brown rot after 6 years, but that soft rot infected the wettest components.

Since 2001, small simulated wall units have been used to test the durability of treated and untreated Pinus radiata framing at Forest Research (Scion). Most trials were established to determine the effectiveness of commercial formulations in preventing decay in framing subjected to intermittent wetting. Test results have been used to develop suitable preservative formulations and retentions for Hazard Class H1.2 for inclusion in NZS 3640: 2003 Chemical preservation of round and sawn timber.

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