ACQ Treated Wood

ACQ Treated Wood is treated at our White City, Oregon manufacturing plant. Wood species treated include Douglas-fir and Hemlock fir; other species can be treated upon customer request.

ACQ stands for Alkaline Copper Quaternary. The ACQ preservative system is based on the well-established effectiveness of copper combined with a co-biocide, and applied to wood by pressure treatment.

Allweather Wood ACQ Treated Wood is backed by a U.S. Lifetime Residential and Agricultural Limited Warranty against structural damage caused by decay and termites. You may download a PDF copy of the warranty for further information: ACQ Lifetime Residential and Agricultural Limited Warranty.

In addition, ACQ Treated Wood meets American Wood Protection Association (AWPA) standards as well as all major model building code requirements. ACQ Treated Wood is also approved by the NAHB Research Center, and certified by Scientific Certification Systems (SCS) as environmentally preferable. Please download the ACQ Green Approved Product declaration for more information.

Common uses of ACQ Treated Wood include:

  • Structural lumber
  • Sill plates
  • Patios
  • Deck substructure
  • Fence posts
  • Garden edging
  • Landscaping structures

It is recommended to always use hot-dip galvanized, stainless steel, or other fasteners and hardware as recommended by the hardware manufacturer.


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Allweather Wood 815 S 32nd Street
PO Box 227
Washougal, WA 98671

(800) 777 8134 – Main Number
(360) 835 3692 – Fax

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