COPPER NAP

Key Benefits of QNAP® Treated Lumber

• Can be used in sensitive environments such as for elevated train tracks in urban areas, over waterways, and in freshwater applications.

• Non-Conductive/Non-Corrosive

• Efficacy superior to other Preservatives

• Less Drippage/Bleeding in Commercial Experience

• Clean Handling Characteristics

• Is EPA labelled to allow Recycling and Energy Recovery

• Lubricating and water repellent Properties of an Oil-Borne Preservative

• Does not encourage secondary/smoldering combustion

• Cost Effective, long lasting, Non-Restricted Use Preservative

Best Applications

• Utility poles

• Railroad bridges

• Railroad ties

• Switch ties

• Pedestrian bridges

• Fencing

• Landscaping timbers

• AWPA M4 field treatments

• Retail preservative

AWPA Standards & Building Code Requirements

The American Wood Protection Association (AWPA), a non-profit organization which promulgates voluntary wood preservation standards, developed a Use Category system that classifies treated wood based on its intended exposure and service conditions rather than by specific wood products. This system helps simplify selection for both professionals and consumers. Since most building codes now reference AWPA standards, the Use Category system is gradually replacing the older Commodity-based classifications in construction codes. 

AWPA U1-11 Section 6C Standards & P36

BMP

The Western Wood Preservers Institute, in conjunction with industry representatives, users, and scientists, developed BMPs to help insure fixation of preservative chemical in treated wood prior to shipment. In the fixation process, some preservative components bond to the wood while others form insoluble precipitates. Specification of BMPs results in wood with a very high percentage of fixed preservative, and may also reduce shipping weight.

INCISING

In many western species, penetration improvement methods are employed to improve the depth and uniformity of preservative penetration into wood. Most commonly this is seen as a pattern of slits ("incisions") on the surface of lumber. Full-length incising and deep-incising are other methods, as are radial-drilling and through-boring, used mostly for poles and piling.

Although these methods can improve preservation, they can result in a strength reduction for the wood, depending on the pattern, size, and number of incisions. When treated sawn wood products have been incised, the reference design values must be multiplied by the incising factor, Ci, in accordance with section 4.3.8 of the National Design Specification for Wood Construction. A review of penetration improvement methods is recommended before insertion into a specification.

NOTE: Incising is required by the AWPA Standards for refractory species. DF is a refractory species with up to 75 % heartwood.

TREATED TO REFUSAL

This phrase — Treated to Refusal — indicates that the wood was treated under specific conditions until it refused additional preservative, a point usually below the requirements of industry standards. The result is wood that cannot be relied upon to last as long as wood that meets standards. Such wood does not comply with model building code requirements for treated wood. 

To assure yourself of properly treated wood, look for the logo of an ALSC-accredited inspection agency on lumber tags or ink stamps. The logo often appears beside a Checkmark symbol.