Menu

Tech Library

Technical Library

WWPI is the recognized source for information on preservative-treated wood, offering a variety of publications detailing how to properly specify and use treated wood products. To view or download a publication, click on the PDF icon. Please review the Disclaimer concerning this information.

Use the Quick Links on the left for fast access to publications by subject.

Sources

Sources of Supply Sources of Supply
Directory of Western preserved wood products manufacturers, with sales contact information, products available and preservative treatments offered.
2 pages, 09/16
PDF
Assoc_Directory Associate-Supporting Member Directory
2016 listings for WWPI Associate and Supporting Members, featuring company descriptions and contact information. 
16 pages, 06/16
PDF

Specifying Preserved Wood

Treated Wood Guide App 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
GetApp
PreserveSpec Use Categories NEW! Preserved Wood: Wood That Lasts
Full-color overview of Western preserved wood uses, standards, quality assurance, preservatives and environmental benefits.
8 pages, 12/16
PDF
PreserveSpec Use Categories NEW! 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 rentions for specific applications and an infographic for typical residential uses.
4 pages, 09/16
PDF
PW_Infographic NEW! 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, 05/17
PDF
Deck span calculator 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
Excel
Preserved Wood and the 2015 IBC UPDATED! PreserveSpec - Preserved Wood and the 2015 International Building Code
Code references recognizing the use of preserved wood in building construction in the 2015 International Building Code (IBC).
2 pages, 03/17
PDF
Preserved Wood and the 2015 IRC UPDATED! PreserveSpec - Preserved Wood and the 2015 International Residential Code
Code references recognizing the use of preserved wood in residential construction in the 2015 International Residential Code (IRC).
2 pages, 03/17
PDF
ALSC Agencies 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, 01/17
PDF

Product Use

Field Test 2015 UPDATED! 37-Month Report - Performance of Wood Coatings
A 37-month update on research by Oregon State University on the performance of wood protection coatings such as BluWood, TimberSil and Eco Red Shield compared to pressure-treated wood.
13 pages, 01/17
PDF
Preserved Wood Planters 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
PDF
preservatives PreserveTech - Preservatives
Overview of the preservatives used in the most commonly available preserved wood products in the building materials market today.
2 pages, 02/16
PDF
Incising 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
PDF
Fasteners 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, 05/15
PDF
FieldTreat 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, 07/15
PDF
Landscape 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
PDF
AgPosts 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
PDF
C-Standards 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
PDF
CCA Treated Hemlock 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
PDF

Environment

LCA ACQL 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.
PDF
LCA Borate 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.
PDF
LCA CCA Marine Piling 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.
PDF
LCA Guard rail 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.
PDF
LCA Ties 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.
PDF
Guardrail Evaluation 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
PDF
CIW Publication Carbon Impacts of Wood
A U.S. Forest Products Laboratory overview of calculating the carbon footprint of wood products.
4 pages, 01/13
PDF

Aquatics

Best Management Practices Best Management Practices
Guidelines and specification recommendations to assure preserved wood products are produced and installed in a manner which minimizes any potential for adverse impacts to aquatic environments.
36 pages, 04/12
PDF
TW in Aquatic Environments 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
PDF
Screening Level Assessment 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
PDF
Enviro Assessment Model 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. Users can register to save project parameters and print detailed reports as documentation.
Online
Excel
Aquatic Assessment Model 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
Excel
Chapter 9 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

Click here to order the full book.
PDF
NOAA Final Treated Wood Guidelines 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
PDF
Timber Manual UPDATED! Timber Pile Design and Construction Manual
Engineering and design manual for timber pilings in construction.
145 pages, 07/16
PDF

Utility Poles

Pole Sources Western Sources of Supply for Wood Poles
List of companies in the Western states that produce preserved wood poles. Includes sales contact information.
1 page, 07/14
PDF
NAWPC WoodPoles.org Technical Library
Link to North American Wood Pole Council library of publications on treated wood poles.
Web

Fire Retardant

FRT Brands IBC Codes Fire Retardant Treated Wood Labels, Codes
Information sheet detailing elements on quality marks for interior, exterior fire retardant treated lumber and code references regarding use of these products.
2 pages, 01/12
PDF
FRTW in Bldg Code UPDATED! Fire Retardant Wood and the 2015 International Building Code
Code references recognizing the use of fire retardant treated wood in construction in the 2015 International Building Code.
2 pages, 03/17
PDF

Disposal

Management Used Treated Wood Products Management of Used Treated Wood - Federal
Overview of the federal requirements for managing and disposing of used preserved wood products.
17 pages, 01/01
PDF
Disposal Rules for Wester States 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
PDF

California Disposal

Treated Wood Waste Generators NEW! Treated Wood Disposal in California: What You Need to Know
Review of important considerations for lawfully disposing of Treated Wood Waste (TWW) in California, with links to relevant information.
2 pages, 03/17
PDF
Treated Wood Waste Generators Fact Sheet - Treated Wood Waste Management in California
Guidance on managing and disposing treated wood waste, from the California Dept. of Toxic Substances Control.
4 pages, 12/08
PDF
Guidance Document for Disposal of Treated Wood Guidance for Treated Wood Disposal, California
WWPI recommendations for handling and disposing of preserved wood waste in California.
2 pages, 07/05
PDF
CA Landfill California Landfills Accepting Treated Wood Waste
List of landfills in California approved to accept preserved wood waste.
2 pages, 07/13
PDF
For additional materials on disposal of treated wood in California, go to the Technical Library Archive.

Recycling

Treated Wood Fuel Recycling 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
PDF
End of life 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
PDF

California Prop 65

CA Warning Sign Retail Notice Treated Wood Public Warning for Retailers
Warning notice and posting instructions as defined in Proposition 65 for retailers selling treated wood in California.
2 pages, 11/04
PDF

Technical Archive

End-of-Life Management of Preserved Wood 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
Web