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Sources of Supply
Directory of Western preserved wood products manufacturers, with sales contact information and preservative treatments offered.
2 pages, 07/24 |
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Specifying Preserved Wood
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UPDATED! Treated Wood Guide smartphone app
App for smartphones and tablets that puts information to select the right preserved wood products right in your hand. Available for Apple iOS and Google Android smartphones and tablets and can be dowloaded from the respective app stores.
Free app |
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Preserved Wood: Wood That Lasts
Full-color overview of Western preserved wood uses, standards, quality assurance, preservatives and environmental benefits.
8 pages, 12/16
International editions
Wood That Lasts - Chinese
Wood That Lasts - Japanese
Wood That Lasts - Spanish |
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PreserveSpec - Specifying with AWPA Use Categories
Detailed information on how to specify Western preserved wood for residential construction with the AWPA Use Categories. Includes current Use Category definitions, service conditions, preservatives, required retentions for specific applications and an infographic for typical residential uses.
4 pages, 05/20
International editions
Specify - Chinese
Specify - Japanese
Specify - Spanish |
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Preserved Wood Infographic
See the typical uses of preserved wood in a residential setting in this infographic. Developed through the AWPA Education Task Group, the infographic provides guidance in selecting the right preserved wood for common uses around the home.
2 pages, 05/20 |
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Guidelines for the Selection and Use of Pressure-Treated Wood
U.S. Forest Product Laboratory guide summarizing the characteristics of pressure-treating preservatives and providing guidance for the selection of preserved wood for specific applications. It also discusses construction practices, service life expectations and environmental considerations.
40 pages, 03/20 |
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NEW! Durable Solutions for Balconies & Decks
Guide identifying design principles and construction practices to improve the moisture performance of wood-framed balconies and decks in low- and mid-rise multifamily buildings. Published by the U.S. Forest Product Laboratory and Home Innovation Research Labs.
68 pages, 05/23 |
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Deck Joist Span Calculator for Preserved Wood
An Excel-based utility to determine deck joist spans for preservative-treated Douglas Fir and Hem-Fir lumber. Includes adjustments for incising, if needed. The calculator was developed in cooperation with Western Wood Products Association. Microsoft Excel is required to use the calculator.
.ZIP file, 12/15 |
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PreserveSpec - Preserved Wood and the 2018 International Building Code
Code references recognizing the use of preserved wood in building construction in the 2018 International Building Code (IBC).
2 pages, 05/18 |
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PreserveSpec - Preserved Wood and the 2018 International Residential Code
Code references recognizing the use of preserved wood in residential construction in the 2018 International Residential Code (IRC).
2 pages, 05/18 |
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Effective Termite Protection for Multi-Family & Commercial Wood Buildings
A Wood Works guide on how to design and construct wood-frame buildings for termite prevention, and how to keep buildings insect-free over the long term.
12 pages, 12/19 |
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ALSC Accredited Agencies - Treated Wood
Listing of agencies accredited by the American Lumber Standard Committee to provide third-party inspection of preserved wood products.
3 pages, 01/23 |
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Product Use
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UPDATED! Performance of Wood Coatings vs. Preserved Wood
Final report on a nine-year research project by Oregon State University assessing the performance of wood protection coatings such as BluWood, TimberSil and Eco Red Shield compared to pressure-treated wood.
18 pages, 06/23 |
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PreserveTech - Preservatives
Overview of the preservatives used in the most commonly available preserved wood products in the building materials market today.
2 pages, 05/23 |
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PreserveTech - Infrastructure Preservatives
Overview of the oil-type preservatives used for infrastructure products such as utility poles, rail ties, bridge timbers and marine pilings.
2 pages, 05/23 |
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NEW! PreserveTech - Safe Garden Boxes Using Preserved Wood
Product technical sheet detailing research that shows vegetables and plants grown in preserved wood garden boxes are safe. Studies by Oregon State University indicate the preservative does not affect the produce, contrary to unwarranted concerns seen on the Internet.
2 pages, 04/24 |
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NEW! PreserveTech - Checks and Splits
Product technical sheet reviewing checks and splits in timbers, beams,posts and other sawn lumber, why they occur and how they typically have little impact on the structural or servicability of preserved wood products.
1 page, 06/23 |
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PreserveTech - Incising
Product technical sheet describing incising for preserved wood products, explaining why and how wood is incised and the impacts on the strength values of the wood.
1 page, 05/15 |
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PreserveTech - Fasteners
Product technical sheet describing the recommended fasteners for preserved wood and the building code requirements for fasteners such as nails, nuts, bolts and washers.
1 page, 12/19 |
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PreserveTech - Field Treating
Product technical sheet describing the recommended field treating for cuts and holes make in preserved wood during construction. Includes links to recommended preservatives for field treating.
1 page, 12/19 |
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PreserveTech - Specifying Landscape Timbers
Product technical sheet describing the how to specify properly pressure-treated landscape timbers and caution about materials that are made to look like pressure-treated products but do not have the same protections against decay fungi or insects.
1 page, 07/15 |
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PreserveTech - Converting to Use Categories from C-Standards
Product technical sheet describing how to convert specification referencing the previous Commodity or C-Standards to the current AWPA Use Category and Commodity Specifications.
2 pages, 03/16 |
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Condition of CCA Treated Guardrail Posts after 20 Years in Service
Report by Oregon State University on the condition of Hem-Fir guardrail posts preserved with CCA after 20 years in service in Washington state.
19 pages, 11/12 |
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Wood Handbook - Wood as an Engineering Material
U.S. Forest Products Laboratory guide to using wood as an engineering material, reviewing all aspects of using wood in construction -- including pressure treating. Presented online with links to each of the 20 chapters of the book.
543 pages, 03/21 |
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Wood Handbook - Chapter 15, Wood Preservatives
Selected chapter from Wood Handbook detailing wood preservatives and the process of making, selecting and using pressure-treated wood products.
28 pages, 03/21 |
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Environment
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NEW! PreserveWise - Life Cycle Assessments and Preserved Wood
Overview comparing the environmental friendliness of building materials using internationaly Life Cycle Assessments (LCAs). Explores how preserved wood products offer the lowest environmental impact vs. alternative materials using objective standards.
2 pages, 06/23 |
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PreserveWise - Sustainability of Preserved Wood Products
Review of the renewability and sustainability of preserved wood products used in construction. Details how the long service life of preserved wood allows new trees to be grown to become the source for replacement products.
2 pages, 04/22 |
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Summary - LCA of ACQ Wood Decking vs. Wood Plastic Composite Decking
Executive summary of a life cycle assessment detailing the environmental impacts of ACQ-treated lumber decking compared to wood plastic composite decking.
6 pages, 05/12
Click here to purchase full LCA report. |
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Summary - LCA of Borate-Treated Lumber Framing vs. Galvanized Steel Framing
Executive summary of a life cycle assessment detailing the environmental impacts of borate-treated framing lumber compared to galvanized steel framing.
6 pages, 05/12
Click here to purchase full LCA report. |
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Summary - LCA of Wood Marine Pilings
Executive summary of a life cycle assessment detailing the environmental impacts of wood marine pilings compared to concrete, galvanized steel and plastic marine pilings.
6 pages, 11/12
Click here to purchase full LCA report. |
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Summary - LCA of Highway Guard Rail Posts
Executive summary of a life cycle assessment detailing the environmental impacts of CCA-treated highway guard rail posts compared to galvanized steel posts.
6 pages, 02/13
Click here to view and download full LCA report. |
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Summary - LCA of Railroad Ties
Executive summary of a life cycle assessment detailing the environmental impacts of Creosote-treated railroad ties compared to concrete and plastic rail ties.
7 pages, 04/13
Click here to view and download full LCA report. |
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Economic Evaluation of Treated Wood and Steel Guard Rail Posts
Detailed evaluation of the environmental impacts and economics of treated wood and galvanized steel guard rail posts.
8 pages, 05/13 |
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Carbon Impacts of Wood
A U.S. Forest Products Laboratory overview of calculating the carbon footprint of wood products.
4 pages, 01/13 |
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Aquatics
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UPDATED! Specifiers Guide - Best Management Practices
Overview of the industry's Best Management Practices (BMP) program and guidelines for specifiers to ensure BMP-compliant preserved wood products are produced and installed in a manner which minimizes any potential for adverse impacts to aquatic environments.
16 pages, 12/18 |
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NEW! Production Guide - Best Management Practices
Overview of the wood treating production processes to meet the Best Management Practices (BMP) program that ensure BMP-compliant preserved wood products are produced in a manner which minimizes any potential for adverse impacts to sensative and aquatic environments.
20 pages, 03/19 |
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Treated Wood in Aquatic Environments
Specification and environmental guide for selecting, installing and managing wood preservation systems in aquatic and wetland environments.
36 pages, 12/12 |
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Screening Level Assessment Process and Worksheets
An overview and instructions on how to use the Environmental Assessment Model to estimate the potential effects of proposed applications of treated wood in aquatic environments to meet Endangered Species Act consultations through NOAA.
36 pages, 04/11 |
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NEW! Online Environmental Assessment Model
An online preservative risk assessment model that evaluates preserved wood structures above and below water and estimates potential migration of preservatives into the environment. Provides inputs for a variety of environmental conditions where the preserved wood will be used and covers 11 of the most commonly used preservatives. |
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Environmental Assessment Model - Excel
An Excel-based version of a preservative risk assessment model that provides evaluation of structures above and below water built with wood treated with one of 11 of the most commonly used preservatives. Microsoft Excel is required to use the model.
.ZIP file, 04/10 |
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Modeling the Environmental Risk for Treated Wood in Sensitive Environments
Description of the science behind the Environmental Assessment Model, excerpted from aquatic science book "Managing Treated Wood in the Environment" by Dr. Kenneth Brooks.
94 pages, 02/09
See below to review the full book. |
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NOAA Fisheries Guidelines for Use of Treated Wood in Aquatic Environments
Guidance document for fisheries biologists in assessing the uses of preserved wood in aquatic environments.
58 pages, 10/09 |
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UPDATED! Timber Pile Design and Construction Manual
Engineering and design manual for timber pilings in construction.
145 pages, 07/16 |
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Managing Treated Wood in Aquatic Environments
Textbook published by the Forest Products Society detailing industry research on using preservative-treated wood products in aquatics.
504 pages, 2011
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Agriculture
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Post and Pole Manufacturer Survey 2023
Report on a survey of post and pole manufacturers in the Inland West reviewing their competitive position, sources of raw material, markets for products and issues impacting the future of the industry.
26 pages, 07/23 |
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PreserveTech - Specifying Preserved Wood Posts for Agriculture
Product technical sheet describing how to specify pressure-treated round posts for use in agriculture and the impact of heartwood in preservative treating such posts.
1 page, 11/15 |
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Using Preserved Lumber for Garden Boxes
Research abstract from Oregon State University indicating the use of preserved wood in garden boxes poses little risk of increasing metal levels in the resulting crops.
2 pages, 03/14 |
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Utility Poles
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WoodPoles.org Technical Library
Link to North American Wood Pole Council library of publications on treated wood poles. |
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Fire Retardant
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NEW! FireResistantWood.org
Link to website detailing fire retardant-treated wood and how to properly specify and source the products. Features an Online Technical Library for fire retardant lumber and plywood. |
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Disposal
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NEW! Waterborne Wood Preservation and End-of-Life Removal
Scientific paper reviewing the history and projections of end-of-life removal of wood products treated with waterborne preservatives, highlighting the declining volue of wood containing arsenicals being disposed.
23 pages, 02/20 |
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Management of Used Treated Wood - Federal
Overview of the federal requirements for managing and disposing of used preserved wood products.
17 pages, 01/01 |
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Management of Used Treated Wood - West
Overview of the requirements by Western states for managing and disposing of used preserved wood products.
6 pages, 02/10 |
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California Disposal
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NEW! TWWDisposal.org
Link to website featuring comprehensive information on disposing of Treated Wood Waste (TWW) in the state of California. Details the responsibilities for those disposing of TWW and includes links to the list of authorized landfills in the state that can accept TWW. |
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Recycling
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Recycling Treated Wood as Fuel
White paper detailing the benefits of using preserved wood as fuel for boilers, furnaces and waste-to-energy facilities.
3 pages, 04/05 |
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End-of-Life Management of Preserved Wood
A case for using preserved wood products as a fuel source to produce environmentally responsible bioenergy.
4 pages, 11/10 |
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Technical Archive
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Additional Resources on Treated Wood
Supporting and historical documents on preserved wood in the following areas:
- Products & Preservatives
- Design & Specifications
- Aquatics
- Fire Retardant
- Disposal - California
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