Understanding the End Tag

Close- up of ProWood Pressure-Treated Board with Ground Contact End Tag

Essential source of information

End Tags attached on ProWood® lumber are an essential source of information for any professional builder or DIYer.

Understanding the End Tag Graphic


1. Description of use:

This label specifies if the product is being treated per ESR or AWPA (American Wood Protection Association) standards and is compliant with model building code requirements.

2. Warranty statement:

ProWood offers a Lifetime Limited Warranty for Ground Contact and Above-Ground lumber as long as you own it.

3. ‘Double-Box’ symbol:

Required for building code compliance; indicates the AWPA standard and the third-party inspection agency.

4. Code for standard:

MCA-treated decking, lumber, and timber meet AWPA (American Wood Protection Association) standards at UFP-affiliated treating plants. AWPA is the wood-treating industry’s consensus-based, standard-setting body with industry experts, researchers, educators, users, and producers. AWPA specifies the level of MCA treatment according to specific categories and end uses.

5. Code for use/exposure category:

The code represents the building category for structural use.

6. Preservative system:

This states the chemical used to treat the wood.

7. Product Care:

This section provides specific details on safe handling, fastener and warranty information, and resources to learn more.
Stacks of Pressure-Treated Lumber

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Certifications & Features


Need technical information about our treatment process, products or warranty? Refer to the tabbed sections below for additional information.

PW Choose The Right Lumber Black Tag Brochure_0523

Guide to Choosing the Right Lumber

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ProWood Pressure Treated Brochure

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ProWood Color Treated Brochure

454 KB

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NGBS Green Certification

NGBS Green Certification

218 KB

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SCS MCA 2024

SCS Global Koppers Certification

307 KB

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ProWood Lifetime Limited Warranty

192 KB

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  • How do I know if the treated wood I'm using is properly treated for my intended use?
    Look for a lumber end tag. Each piece of ProWood lumber has a tag containing information regarding the preservative used, the appropriate end use (i.e. above-ground or ground contact), the quality standard and safe handling instructions. To learn more, visit our Understanding the End Tag page.
  • What is the significance of the tags stapled to my lumber?
    ProWood lumber attaches end tags to ensure that our customers know key information about the product. The tags can include information about available warranties, whether or not the product is for direct ground contact or strictly above-ground applications and, where applicable, details for acceptance by local building codes. Many of the tags on ProWood products also have detailed information on the safe handling of ProWood, the same information contained in the warranties.
  • How safe is ProWood?
    ProWood treated wood is very safe when used as directed in the appropriate applications. The preservative injected reacts with the wood to form an insoluble complex that won't evaporate or vaporize. ProWood is clean, odorless, non-staining, and safe to work with and handle. Its built-in protection is non-irritating for dermal contact with children, adults, animals and plants. We have carefully and exhaustively studied the minute amounts of preservative released during a ProWood structure's serviceable lifetime. The conclusion is clear: ProWood is also safe, long-term, for the environment and for contact with people and pets. In our opinion, ProWood MCA treated wood — as with any wood product — should not be used where household pets would be likely to chew or ingest the wood. The process used to treat ProWood is the first to gain Environmentally Preferable Product (EPP) as certified by Scientific Certification Systems (SCS). Scientific Certification Systems is a third-party certification services and standards development company. According to the EPA, to be EPP certified means that the product has a reduced impact on human health and the environment when compared to other products that serve the same purpose.
  • What preservatives are used for pressure treating ProWood and how long are they effective?
    For a long time, CCA (Chromated Copper Arsenate) was the primary wood preservative. CCA-treated wood protects against all major forms of destructive attack and is effective for many years. More recently, preservative manufacturers switched to ACQ (Alkaline Copper Quaternary). ACQ is also effective for decades, reducing demands on forest resources. Another common preservative is a solution containing natural, environmentally safe mineral salts called borates. Borate lumber has a powerful barrier against termites — even the extremely destructive Formosan termite. The new generation of pressure-treated wood uses micronized copper as a preservative. This method enables ProWood to stand up against termite damage and fungal decay.
  • Why use ProWood pressure-treated lumber?
    Lumber's greatest enemy is biological attack — destruction by termites, fungi and marine borers — as well as damage from rain, sun and wind. Thanks to over 50 years of research, ProWood can stand up to every threat for decades of use.

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