Critical Structure

ProWood Pressure-Treated Deck Boards by Sparkling Water

Rely on ProWood Critical Structure for your toughest jobs.

ProWood® treated lumber offers a wide selection of grades to suit virtually any outdoor project. Our toughest treatment, critical structure, is suited for heavy-duty applications and offers an unbeatable warranty.

ProWood Critical Structure End Tag and Uses

Product availability

Click here to check availability in your area. Availability varies per region. 

Species Grades Treatment Options
  • SYP

Certifications & Features

American Wood Protection Association AWPA Logo


PW Choose The Right Lumber Black Tag Brochure_0523

Guide to Choosing the Right Lumber

3704 KB

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ProWood Pressure Treated Brochure

579 KB

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10514_Prowood FR_Warranty_2023

ProWood FR 50-Year Warranty

558 KB

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ProWood Builder and Spec Guide

652 KB

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Staining & Sealing ProWood Treated Lumber

134 KB

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ProWood Pressure-Treated Maintenance Plan

110 KB

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ProWood Safe Handling Information

83 KB

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SDS MCA 2024


1141 KB

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Greenguard Gold Certification

Greenguard Gold Certification

664 KB

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ProWood ESR-2240

ProWood ESR-2240

315 KB

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UL Certificate of Compliance - Plywood

236 KB

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UL Certificate of Compliance - Lumber

303 KB

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  • 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.
  • 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.
  • Is ProWood pressure-treated wood building code approved?
    You should always consult your local building codes before application. When working with ProWood pressure-treated decking, lumber and timbers, you'll want to locate the double-box symbol on the end tag. The double-box symbol is required for building code compliance; indicating the standard authority and the third party inspection agencies. Generally, ProWood decking, lumber and timber products will carry the double-box symbol demonstrating that they are code compliant when used in the right application.


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