Code Compliance


Code Compliant Above Ground and Ground Contact Offer Added Benefits

Above ground treated wood is code compliant for most deck projects. It remains International Building Code (IBC®) and International Residential Code (IRC®) compliant for most deck projects under Section R317.1 and Section 2303.1.9 respectively.


Exclusive formula for looks and longevity

  • Reduces cracking and splitting up to 50%
  • Repels water for up to three years
  • Stabilized boards stay straighter
  • Protects against termites and fungal decay
  • Non-metallic wood preservative
  • Less corrosive to fasteners
  • Perfect for deck joists, support beams, decking and railings 6” or greater above the ground
  • Can be used with a water-impermeable barrier for close ground installations


For lasting support and protection

  • All-purpose
  • Protects against termites and fungal decay
  • Ideal for residential, commercial and certain agricultural projects
  • Use for fresh water immersion and salt water spray application

above ground ground contact


To help reinforce the continued code compliance of above ground UC3B lumber for deck construction, we have reaffirmed our Lifetime Limited Warranty on above ground preservative treatment when used properly.

The AWPA revisions created confusion in the marketplace. Now more than ever, above ground treated wood is a great choice for architects, deck-building contractors, and home owners looking to build a long-lasting elevated deck.



Viance’s renewed commitment to a Lifetime Limited Warranty on fungal decay and termite infestation signals to retailers, architects, contractors, home owners, and others in the industry that they stand behind the performance of their products when properly used in residential applications.

As code officials are inspecting deck projects, they should be guided by the latest, most accurate information available. Knowledge is power, and we want them to know that above ground treated wood remains IBC and IRC code compliant for most common decking applications under Section R317.1 and Section 2303.1.9 respectively.


Front of End Tags

To comply with the International Building Codes, pressure-treated wood shall bear the quality mark of an inspection agency that maintains the continuing supervision, testing and inspection over the quality of the treated wood.

Inspection agencies for treated wood shall be listed by an accreditation body that complies with the requirements of the American Lumber Standards Committee (ALSC) Treated Wood Program, or equivalent. The quality mark shall be on a stamp or label affixed to the treated wood, and shall include the following information:

  1. AWPA U1 – this shows the preservative is listed in the AWPA Standards
  2. AWPA (UCS) Use Category – Include BOTH Name and UCS Abbreviation Code
  3. Preservative code required. (ACQ or CA-C)
  4. Preservative Name Optional: Alkaline Copper Quaternary or Copper Azole Type C
  5. Preservative retention – the amount of preservative retained in the wood, such as 0.40, 0.60
  6. CheckMark and Inspection agency logo – if the treating plant subscribes to third-party quality control, you will see the logo of an agency accredited by the American Lumber Standard Committee and usually a “CheckMark” logo to make it easier to locate the agency logo.
  7. Manufacturer and Location – Name of treater and location of treating plant.

Optional Information:

  1. Year: Indicate year of treatment
  2. Lifetime Limited Warranty

Bag of End Tags

Important Information:

  • California Prop 65 *
  • Fasteners and Connectors
  • Safety Information

* Required if sold into or used in California



Not all treated wood is the same. The key differentiator for code officials, architects, contractors, and home owners is the end tag on the lumber. That end tag should bear the distinctive CheckMark of Quality (pictured) as proof of ANSI-accredited, consensus-based AWPA standardization.

The CheckMark of Quality assures code officials, builders, and consumers that the preservative has been reviewed by the AWPA to meet stringent standards for superior deck life, performance, and environmental safety. The AWPA standards are directly referenced in the IBC® and IRC® model building codes.


Not every preservative has earned the CheckMark of Quality. Code enforcement officials need to feel confident that the wood they’re inspecting is AWPA standardized. The CheckMark of Quality offers code officials the certainty they need at inspection time.

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