Real Wood for Your Outdoor Spaces

Proven Long-term Protection

Preserve® is a family of fully-dissolved copper-based wood preservative solutions for exterior wood products. Preserve formulations provide long-term protection from fungal decay and termite attack for a wide variety of residential, commercial and agricultural construction projects including above-ground, ground contact, fresh-water immersion, and salt-water splash applications.

In the US and other countries, ACQ and CA-C are registered for use on: lumber, timbers, landscape ties, fence posts, building and utility poles, land, freshwater and marine pilings, seawalls, decking, wood shingles, and other wood structures.

The Preserve treatment lends a distinctive green tint to the timber, although an additional color pigment; DesignWood can be introduced during the treatment process to stain the wood in shades of brown and green.

Preserve treatments are also available with a built-in water repellent and marketed as Preserve Plus.

Porch Deck Girls Playing Checkers Landscape
Tahoe Meadows People Walking
Pismo Beach Deck
Pismo Beach Dock
Wooden Fence 1 1024X600Premier Fence
Deck On Beach Landscape
Viance Fencing

Preserve ACQ and CA

Preserve ACQ - Alkaline Copper Quaternary (ACQ) is a water-based wood preservative formulation made of soluble copper and a quaternary compound. The soluble copper makes the wood very resistant to biological attack, and a quaternary ammonium compound (quat) acts as biocide and insecticide, increasing the tolerance of the treated lumber to copper-resistant bacteria and fungi.

ACQ is used throughout the USA, Canada, Europe, Japan and Australia, and is seen as a “greener” preservative and a more sustainable option than previous wood preservatives.

In 2002 Chemical Specialties, Inc. (CSI); now Viance, received U.S. Environmental Protection Agency’s Presidential Green Chemistry Challenge Award for the commercial introduction of ACQ.

Preserve CA - Copper Azole Type C (CA-C) is found readily across the Eastern US and Canada. The preservative formulation is made of soluble copper and organic triazole co-biocides; tebuconazole and propiconazole, which help control copper-tolerant fungi. CA-C is not recommended for saltwater immersion applications.

Product Applications

Preserve ACQ and CA

  • Preserve

    Above Ground Exposed Use

  • Western Species Brown Fence Dw

    Ground Contact General Use

  • Dock Lake

    Fresh-water Immersion

  • Pismo Beach2

    Salt-water Splash

The Qualities That Matter to You

Dock Lake

  • Ideal for residential, commercial and certain agricultural projects for these applications:
  • Above Ground Exposed Use
  • Ground Contact General Use
  • Fresh-water Immersion and Salt-water Splash

Preserve 8

  • Field-tested, proven-to-last, and accepted as an industry standard
  • Building code compliant (IRC and IBC)
  • American Wood Protection Association (AWPA) standardized wood preservatives

Viance Preserve Family

Preserve ACQ and Preserve CA treated wood are covered by a Lifetime Limited Warranty against damage from fungal decay or termite attack when installed in accordance with applicable building codes. See Preserve ACQ and Preserve CA Lifetime Limited Warranty for terms and conditions.

Preserve ACQ and Preserve CA are NAHB Home Innovation Research Labs Green Certified Products for Resource Efficiency and are eligible to contribute points toward a buildings certification under the National Green Building Standard™ (NGBS).

Preserve ACQ Green Certified Product Certificate

Preserve CA Green Certified Product Certificate

  • Always use building-code approved, corrosion-resistant fasteners and connectors that are suitable for use in pressure-treated wood.
  • Recommended Fasteners: use hot-dipped galvanized fasteners (meeting ASTM A 153) or stainless steel.
  • Recommended Connectors: use G185 hot-dipped galvanized for exterior applications.
  • For Permanent Wood Foundations and corrosive environments, such as Coastal areas with saltwater spray, use code approved stainless steel fasteners and connectors.
  • Preserve is not suitable for direct contact with uncoated steel or aluminum building products.



Preserve ACQ and Preserve CA treated wood is covered by a Lifetime Limited Warranty against damage from fungal decay or termite attack when installed in accordance with applicable building codes. See Preserve ACQ and Preserve CA Lifetime Limited Warranties for terms and conditions.