Wolmanized® Residential Outdoor® Wood

Copper azole (CA) preservative has become predominant in the industry, and its most advanced formulation is Type C, which incorporates a patented combination of synergistic co-biocides. This preservative is used in Wolmanized® Residential Outdoor® wood.

Treated with a copper-based preservative and an efficacious fungicide, this wood is ideal for applications including decks, retaining walls, fences, picnic tables, planter boxes, walkways, sill plates and structural members.  It comes with a limited lifetime warranty for most residential applications and has earned the endorsement of Hometime’s Dean Johnson.

Wolmanized® Outdoor® wood is a Green Approved product of the NAHB Research Center.  It is a natural and environmentally responsible choice: it’s made from wood, a renewable resource, treatment extends the life of the wood, and the preservative used is as gentle as it can be and still be effective and long-lasting.  A life cycle analysis confirms the environmental benefits of wood. Another life cycle assessment shows scientifically the environmental advantages of copper azole-treated wood over wood plastic composites.

Code Acceptance

Wood treated with CA-C preservative meets requirements of model building codes for many applications, and a code evaluation report on this wood has been issued by ICC Evaluation Service (ESR-1721).  The CA-C treatment is listed also in the standards of the American Wood Protection Association (AWPA)  for above-ground and ground-contact applications (Use Categories UC1, UC2, UC3A, UC3B, UC4A, and UC4B).  Internationally, it is approved by government and trade agencies throughout Europe and in Australia, New Zealand and Japan.

Recommended Hardware

Hot-dipped galvanized fasteners (meeting ASTM A 153) and connectors (ASTM A 653 Class G185 sheet), or better, are recommended.

For corrosive environments, such as areas with saltwater spray, use 304 or 316 stainless steel.  Aluminum should not be used in direct contact with this wood, unless an adequate physical barrier separates the aluminum from the wood or the manufacturer ensures the performance of the aluminum product.

For indoor applications, while galvanized fasteners are preferable, the use of nongalvanized nails or screws of sizes and types approved by the Model Code is acceptable when attaching joists, studs or other framing to Wolmanized® sill plate, provided the wood will remain dry in service, protected from weather and water.  Likewise, the use of standard galvanized strapping, anchor plates, or mild steel anchor bolts 1/2″ diameter and larger is acceptable for fastening Wolmanized® wood to foundations, provided that the wood will remain dry in service, protected from the weather and water.

Typical Applications

  • Above Ground AWPA Use Category 1, 2, 3A, 3B (.06 pcf)
  • Ground / Fresh Water Contact AWPA Use Category 4A (.15 pcf)
  • Sawn Poles and Posts AWPA Use Category 4B (.31 pcf)

Good Housekeeping Seal

Engineers at the Good Housekeeping Research Institute have deemed Wolmanized Outdoor wood worthy of its Seal.

The Good Housekeeping Seal is a two-year limited warranty to consumers which promises replacement or refund if the product is defective.


This wood has been preserved by pressure treatment with an EPA-registered pesticide, copper azole, to protect it from termite attack and fungal decay. Wood treated with any preservative should be used only where such protection is necessary or important. In the treating process, copper azole penetrates deeply into the wood where it remains for many years. However, a small amount of chemical may migrate from preserved wood into surrounding soil over time and may also be dislodged from the wood surface upon contact with skin. Precautions should be taken when handling the preserved wood. Many of these precautions also apply to untreated wood and other building materials.

Handling Precautions

  • Dispose of treated wood by ordinary trash collection. TREATED WOOD SHOULD NOT BE BURNED in open fires or in stoves, fireplaces or residential boilers
  • When sawing, sanding and machining wood, wear a dust mask. Avoid frequent or prolonged inhalation of sawdust from wood, treated or untreated. Whenever possible, these operations should be performed outdoors
  • Wear gloves when working with wood. Wear goggles to protect eyes from flying particles. Use proper techniques when lifting
  • After working with wood, and before eating, drinking, toileting, or using tobacco products, wash exposed skin areas thoroughly
  • Because preservatives or sawdust may accumulate on clothes, they should be laundered before reuse. Wash work clothes separately from other household clothing
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