Industrial Treatments: CA-B Durapine-Wolmanized
 
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DurapineŽ Treated Wood By Cox
Treating wood with Wolman® copper azole, Cox provides treated wood products under its Durapine® trademark.
Durapine® treated wood is non-arsenic based and effective against termites and fungal decay both above ground and in-ground. The preservation formulation has been in commercial use since 1992 and is now used for treated wood in 15 countries where special environmental concerns or restrictions exist. It is now the most effective and successful alternative to CCA treated wood. It is an ideal choice for playground equipment, outdoor furniture, decks, patios, garden structures, and any residential application for treated wood protection..
Though the compositions of the preservatives differ, many of the characteristics of Durapine® treated wood are very similar to those of traditional treated wood. For instance, Durapine® treated wood has an initial greenish color. It is produced by pressure treatment. It is odorless and clean to the touch. It undergoes a chemical fixation reaction, which bonds the preservative to the wood.
As for longevity, the service life of Durapine® treated wood has been proven through actual use around the world. In providing this extended life to wood, Durapine® treated wood reduces demands on forest resources. It also has the same lifetime limited warranty as traditional treated wood.
Most of the differences between wood treated with copper azole and standard treated wood involve the chemistry of their preservative solutions. Preservative ingredients are copper and azole. Traditional treated wood uses CCA - copper, chromium and arsenate. Treating procedures, retention levels and warranties are nearly identical. The EPA classifies CCA as a restricted use pesticide, but the preservative in Durapine® is not restricted.
One appearance difference; however, becomes obvious with exposure to sunlight. Initially greenish, the wood turns to a honey brown color which can last for an extended period before slowly fading to gray. It can be painted or stained if desired and, to avoid premature moisture damage, will benefit from periodic water repellent coatings for best appearance.
The preservatives used in Durapine® treated wood appears in the standards of the American Wood-Preservers' Association. AWPA has determined that the preservative is effective for listed species of wood used for both above ground and in-ground contact.
Code Acceptance
Durapine® treated wood meets requirements of model building codes for many applications, and a code evaluation report has been issued. See ES Report for allowable values and/or conditions of use. Such reports are subject to re-examination, revisions, and possible closing of file. The preservative treatment is listed in the standards of the American Wood-Preservers' Association and is suitable for above-ground and ground contact applications (Use Categories UC1, UC2, UC3, UC3B, UC4A, UC4B and UC4C). Internationally, it is approved by government and trade agencies throughout Europe and in Australia, New Zealand, and Japan.
Retentions
Different applications may require different amounts of preservative protection. Below are the standards of the American Wood-Preservers' Association for the copper azole formulations.
| Intended End Use | AWPA Use Category | Copper Azole CA-B lbs./cu.ft. |
Typical Applications |
|---|---|---|---|
| Decking* | NER-669 | 0.08 | Sapwood species: decking and specialties |
| Exterior Construction Above Ground | 3B | 0.10 | Decking, deck joists, railings, fence pickets |
| Ground Contact or Fresh Water | 4A | 0.21 | Fence posts, structural lumber & timbers, guardrail posts, utility poles in low decay regions |
| Ground Contact, or Fresh Water or Important Structural Components | 4B | 0.31 | Permanent wood foundations, sawn & round building poles, utility poles in moderate decay regions |
* Recommendation of building code report, not AWPA
AWPA Use Category System
To see the entire table summarizing the AWPA Use Categories and corresponding retention levels for DuraPine and Wolmanized wood, click here.
Recommended Hardware
Hot-dipped galvanized fasteners (meeting ASTM A 153) and connectors (ASTM A 653 Class G185 sheet), or better, are recommended for protection against moisture often present where treated wood is usually used. For Permanent Wood Foundations use 304 or 316 stainless steel. Aluminum should not be used in direct contact with this wood.
For indoor applications, while galvanized fasteners are preferable, the use of non- galvanized 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 ˝" 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.
Disposal
Wolmanized wood waste, such as scraps, broken boards, and sawdust, can be disposed of with ordinary trash collection. Neither the wood nor the preservative residues are considered hazardous wastes. If a particular landfill has restrictions against CCA-treated wood, it may accept Wolmanized Outdoor wood. Treated sawdust and shavings are not recommended for composting, mulching, or animal bedding, and the wood should not be burned except in approved commercial incinerators.
Durapine Product Guide
DuraPine Warranty
Treated Wood Product Information
Treating What Goes on Our Plant
Wolmanized Outdoor Wood Specifications