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MicroPro Sienna® Treated Wood can be used in residential applications (decks, fences, freshwater docks and landscaping) above ground, in ground contact and in freshwater contact. The appropriate usage is noted on the end tag attached to each piece of MicroPro Sienna Treated Wood.



Above Ground

Wood treated for above ground applications can be used in exterior construction where the wood is NOT in contact with soil, placed on or over soil using a synthetic barrier, subject to frequent wetting, or continually exposed to heavy vegetation, mulch products or other conditions that could simulate a ground contact exposure. These include products such as decking, fence boards, railing components, and elevated walkways.

Ground Contact

Ground contact shall be taken to mean permanent and direct contact with soil. Lumber treated for ground contact has a higher preservative retention level than above ground. This is to improve the performance of the treated wood when it comes in direct contact with the ground (soil), fresh water, high moisture areas, etc., where it is highly vulnerable to deterioration.

Treated wood used as structural elements in or on the ground, continuously wetted or immersed in fresh water is more vulnerable to rot and therefore requires a higher level of preservative protection for better long-term performance.

In addition, wood treated to ground contact is needed in the following applications:

  • Decks built close to or on the ground
  • Decks enclosed with solid skirting, prevent air circulation
  • Raised garden beds or planter boxes
  • Freshwater docks

For 2” wides (2×8, 2×10, 2×12) treated to ground contact look for MicroPro Sienna TOUGH.

For more information on where above ground and ground contact treated products should be used, see the MicroPro Sienna Residential Treated Wood Use Category Guide.

Important Information

Above Ground treated wood should not be used in ground contact applications, as this can adversely affect the performance of the entire project.

On treated wood used for structural applications (joists, beams, posts), incising is required to provide sufficient preservative performance.

Treated wood should not be used where it may come into direct or indirect contact with drinking water, except for uses involving incidental contact such as freshwater docks and bridges.

Do not use treated wood under circumstances where the preservative may become a component of food, animal feed, or beehives.

If the wood is to be used in an interior application and becomes wet during construction, it should be allowed to dry before being covered or enclosed.

Projects should be designed and installed in accordance with federal, provincial, and local building codes and ordinances governing construction in your area.


Actual product colour may vary from colour shown in photos.
MicroPro Sienna Treated Wood products are produced by independently owned and operated wood preserving facilities.
MicroPro, MicroPro Sienna, and Cut-N-Seal are registered trademarks of Koppers Performance Chemicals Inc.