Advanced and proven preservation system

Preserve® is treated with ACQ®, a copper plus quaternary preservative system that provides long-term protection from fungal decay and termite damage for a wide variety of residential, commercial and agricultural construction applications.

Preserve and Preserve Plus each received NAHB Research Center National Green Building Certification as a “Green Approved Product”, and are eligible to contribute points toward certification of a building under the National Green Building Standard™.


  • Use categories: U1, T1, UC1, UC2, UC3A, UC3B, UC4A, UC4B, UC4C
  • Certified as a “Green Approved Product” by the NAHB Research Center and eligible to contribute points towards the National Green Building StandardTM
  • ICC Evaluation Service Report (NER 643)
  • Winner, 2002 US EPA Presidential Green Chemistry Award
  • Canadian Standards Association (CSA-O80)
  • Japanese Industrial Standards (JIS)
  • Australian/New Zealand AS/NZ Standard 1604
  • Australian Quarantine and Inspection Service (AQIS)
  • American Association of State highway and Transportation Officials (AASHTO M-133)


  • For the best results, use of building-code approved, corrosion-resistant fasteners and connectors is always recommended.
  • Direct contact of Preserve treated wood with aluminum fasteners and fittings is not recommended.

Retention Levels

  • Above Ground Use (.20 pcf) for decking components, 5/4″ decking, fence boards, trim & fascia, framing, flooring, sill plates, trellises, gazebos, plywood
  • Ground Contact Use (.40 pcf) for deck support posts, fence posts, landscaping, piers, docks, plywood
  • Critical Structural Members Use (.60 pcf).


  • Decks
  • Fencing
  • Gazebos
  • Raised Beds
  • Steps
  • Play sets
  • Walkways
  • Sheds
  • Trellis
  • Lattice
  • Sill Plates
  • Posts
  • Landscaping
  • Docks
  • Pilings (freshwater)


Wear a dust mask and goggles when cutting or handling treated or untreated wood.

  • Wear gloves when working with treated or untreated wood.
  • After working with wood, wash exposed areas thoroughly.
  • Do not burn pressure-treated wood.
  • Wash work clothes separately from other household clothing before reuse.
  • Pressure-treated wood should not be used where it may come into direct or indirect contact with drinking water, except for uses involving incidental contact such as fresh water docks and bridges.
  • Do not use pressure-treated wood in circumstances where the preservative may become a component of food, animal feed, or beehives.
  • Do not use pressure-treated wood for mulch.
  • ACQ treated wood scraps and cut offs should be disposed of in a non-hazardous material lined landfill in accordance with local, state and federal regulations.

Download MSDS: