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.
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 (treated with either dissolved copper azole, CA-C, or dispersed copper azole, μCA-C) 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.
Model Specifications
To download a model specification for Wolmanized® Residential Outdoor® wood as a modifiable MS Word (2002) document, click here.
Retention Standards
Different applications may require different amounts of preservative protection. Below are requirements for copper azole formulations.
| Typical Applications | Use Category* | CA-C | μCA-C | |
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| Above Ground | 1, 2, 3A, 3B | .06 | .05 | |
| Ground / Fresh Water Contact | 4A | .15 | .14 | |
| Sawn Poles & Posts | 4B | .31** | .23 | |
* Presently applies only to CA-C treated wood. ** ICC-ES accepts 0.25 pcf. |
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For an AIA online CEU course on pressure-treated wood, click here. |
