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• Commonly used wood panels' bio-durability is highlighted in this research. • The results showed untreated OSB and CLT were very susceptible to biodegradation. In comparison untreated LVL panels were less susceptible. • Surface application of boron biocide prevented decay development. • Research highlighted the need for further research to understand the extent of moisture ingress in wooden panels. The use of sustainably grown trees and subsequent wood products in built environment contribute towards sustainable future. With proven improved performance in fire and seismic characteristic, the projected market potential for softwood Engineered Wood Products such as CLT (Cross Laminated Timber) and LVL (Laminated Veneer Lumber) for multi-story buildings are very positive. However, potential prolonged rain leakage or moisture exposure during construction and in-service could pose considerable concern for its durability and reputation. This research was conducted to assess the decay resistance of LVL, OSB (Oriented Strand Board) and CLT produced from radiata pine in an accelerated trial. This testing method is used in establishing the effectiveness of wood products in framing subject to intermittent wetting. The results showed untreated OSB and CLT were very susceptible to decay. In comparison, LVL was less susceptible. Testing conducted on CLT using surface application of boron preservative prevented decay. Further work is needed to understand the full extent of moisture ingress in wooden panels during construction and service of the multi-story buildings and improving the durability of panel products. [ABSTRACT FROM AUTHOR]

Various accelerated decay resistance trials, including small simulated wall units, samples exposed in enclosed tanks and ‘I’ samples in stacks, have been explored and used to test the durability of treated and untreated radiata pine framing at Scion since 2001. These testing methods have been established to determine the effectiveness of commercial formulations in preventing decay in framing subjected to intermittent wetting. These are relatively short term test methods requiring a minimum of 12 months testing. Results of these tests have been used to develop suitable preservative formulations and retentions for Hazard Class H1.2 for inclusion in New Zealand Standard for Chemical Preservation of Round and Sawn Timber (NZS, 3640). In New Zealand framing hazard Class H1.2 is for timber that is protected from the weather but with a risk of wood reaching a moisture content conductive to decay. In this communication, we discuss the advantages and disadvantages of these test methods. [ABSTRACT FROM AUTHOR]