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Forest Products Laboratory
One Gifford Pinchot Drive
Madison, WI 53726-2398
Phone: (608) 231-9200
Fax: (608) 231-9592
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Durability and Wood Protection Research

Project Title :  Improved wood treatments and accelerated performance methods for treated wood products
Project Number : FPL-4723-3A
Status : NEW
Start Date : 01-23-2015
End Date : 01-22-2020


View the 38 publications associated with this project.

Principal Investigator:
Carol A. Clausen

Non Technical Summary
PhotoAlmost 400 million cubic feet of preservative-treated wood is produced and consumed in the U.S. annually, with residential applications representing a significant percentage of the treated wood market. However, more environmentally compatible preservative systems are needed to replace conventional broad-spectrum biocides. Since historic changes in 2004 with the voluntary withdrawal of chromated copper arsenate from residential applications, the wood preservation industry has undergone a decade of dynamic changes, including challenges with corrosion, leaching, preservative tolerance by decay fungi, and mold growth on treated products along with fears that replacement preservative systems may also face environmental scrutiny. There is an increasing interest in tailoring preservative treatments to decay hazard and use category rather than using broad-spectrum pesticides for all applications. Societal pressures for environmentally compatible preservatives are difficult to solve swiftly because it takes many years to conduct long-term evaluations to vet a new preservative. Improved methods are needed to more rapidly assess the potential for a preservative to provide long term protection from decay and insects and resist fastener corrosion. These methods must be adapted to assess the severity of the biodeterioration or corrosion hazard anticipated for each use category. The environmental impact of existing preservative-treatments must also be minimized to insure that treated wood can be safely disposed and that is does not adversely affect water quality.


Objectives Summary
The objectives of this problem area are to evaluate the treatability and durability of underutilized wood species from the changing forest resource. We will develop and evaluate methods that accelerate the process of assessing long-term performance of preservative products, develop non-destructive methods for quantitation of decay, and correlate an integrated series of laboratory and field tests. Minimizing leaching of preservative into aquatic environments and from above-ground applications will be assessed to reduce the impact of new wood protection systems. Recycling methods will be developed for treated wood products to divert this waste material from landfills and enable the recycled/remediated wood fiber to be refabricated into value-added products.


Approach Summary
We will investigate methods for reducing the levels of preservative needed, evaluate naturally durable wood species, emphasizing underutilized and invasive wood species and their chemical extractives, and explore alternative methods of impregnating the chemicals to improve environmental and durability performance of existing preservative treatments. Better accelerated test methods to predict performance will be developed to reduce the time needed for the development and acceptance of new environmentally-preferable preservatives. Low-cost treatment options for small diameter materials are needed in order to develop value-added markets for excess biomass to reduce the wildfire hazard as part of the National Fire Plan. Selection of wood species to be evaluated with both conventional and alternative preservatives will be based on their potential contribution to the hazardous fuel levels in the forests, their availability, and the potential market for the treated wood. Evaluation will include the treatability of the wood species by a given preservative and the durability of the treated material. For difficult-to-treat species, options for improving treatability will be investigated. Non-pressure methods and remedial treatments provide low-cost treatment options and the ability to treat wood in-service. Finally, recycling methods that keep treated wood from disposal in landfills will be developed.

Publications associated with this Project

Publication YearTitleDate Posted
2017Accelerated aging of preservative-treated structural plywood09/05/17
2017Amplicon-based sequencing of soil fungi from wood preservative test sites12/21/17
2018Assessment of fastener corrosion and salt damage in the bilge of the Eureka06/06/18
2016Avast Ye Salty Dogs: Salt damage in the context of coastal residential construction and historical maritime timbers03/22/17
2017AWPA biodeterioration hazard map revisited02/13/18
2016Beetles (Coleoptera) of Peru: a survey of the families12/12/17
2014Chapter 14: Evaluating the Leaching of Biocides from Preservative-Treated Wood Products11/13/14
2014Chapter 6: Above Ground Deterioration of Wood and Wood-Based Materials02/11/15
2013Chemical remediation of wood treated with micronised, nano or soluble copper preservatives10/20/14
2017Comparison of performance criteria for evaluating stake test data02/13/18
2016Comprehensive overview of FPL field testing conducted in the tropics (1945-2005)03/22/17
2016Corrosion of metals in treated wood examined by synchrotron based xanes and XFM10/04/16
2015Corrosion of Wires on Wooden Wire-Bound Packaging Crates04/08/15
2016Distribution and oxidation state of copper in the cell walls of treated wood examined by synchrotron based XANES and XFM03/27/17
2018Durability of mass timber structures: a review of the biological risks08/31/18
2015Efficacy of alternatives to zinc naphthenate for dip treatment of wood packaging materials05/06/16
2017Emerald ash borer, black ash, and Native American basketmaking12/13/17
2016Evaluating the effects of post dip-treatment laser marking on resistance to feeding by subterranean termites08/29/16
2017Evaluation of nonpressure wood preservatives for military applications12/07/17
2015Fifty-Year Durability Evaluation of Posts Treated with Industrial Wood Preservatives12/15/15
2015First Record of the Arid-Land Termite Reticulitermes tibialis Banks, in Wisconsin03/10/15
2015Genetic Analysis of Termite Colonies in Wisconsin07/27/15
2018Guidelines to restoring structural integrity of covered bridge members02/14/18
2018Increasing durability of mass timber products in interior applications05/22/18
2018Industry-prioritized research, technology transfer, and education needs and opportunities in residential construction07/27/18
2018Internal moisture content and temperature of standardized aboveground wood durability test specimens08/14/18
2017Long term durability of solid heartwood stakes treated with ACA or CCA01/24/18
2017Modulus of elasticity loss as a rapid indicator of rot-fungal attack on untreated and preservative-treated wood in laboratory tests03/01/17
2018Northeastern United States species treated with copper-based preservatives: Durability in mississippi stake tests09/27/18
2015Performance of Northeastern United States wood species treated with copper based preservatives: 10 year above-ground decking evaluation07/27/15
2017Performance of two solid fumigants in covered bridges03/01/17
2018Protecting log homes from decay and insects07/27/18
2017Statistical process control for residential treated wood02/13/18
2017Synchrotron based x-ray fluorescence microscopy confirms copper in the corrosion products of metals in contact with treated wood06/07/17
2014Synergy and Diffusion with a Borax-Copper Hydroxide Groundline Preservative: 20 Year Update10/07/15
2017Technical Note: Comparison of accelerated methods for evaluating leaching from preservative-treated wood03/17/17
2015Use of a Resistance-type Moisture Meter above the Fiber Saturation Point05/03/16
2015Wood preservatives and pressure-treated wood: considerations for historic-preservation projects03/01/17

Project Summaries last modified: 03-09-2015