CA-C Treated Wood

CA-C Treated Wood is treated at our Coos Bay, Oregon, Loveland, Colorado, and Washougal, Washington manufacturing plants. Wood species treated include Douglas-fir, Hemlock fir, Southern Yellow Pine, Lodgepole Pine, and Ponderosa Pine.

CA-C stands for Copper Azole, type C. Copper azole preservative renders wood useless as a food source for termites and fungi. CA-C incorporates a combination of synergistic azoles; the type C formulation is the most advanced version available commercially.

Depending on your location, one of two Limited Warranty coverages will apply in cases where CA-C Treated Wood suffers damage caused by termites or fungal decay that would render the wood structurally unfit for its intended application. You may review these Warranty documents here:

Lonza® CA-C Limited Warranty Brochure

Osmose® CA Limited Warranty Brochure

CA-C Treated Wood meets requirements of model building codes for many applications; it is also listed in the standards of the American Wood Protection Association (AWPA). In addition, a code evaluation report (ICC-ESR-1721) has been issued for this product.

Common uses of CA-C Treated Wood for ground contact applications include:

  • Round poles and posts
  • Sawn poles and posts
  • Permanent wood foundations
  • Pole type buildings
  • Utility poles
  • Structural lumber
  • Guardrails

Hot-dipped galvanized fasteners and connectors (meeting ASTM A 153) are required by the International Building Code. Connectors should be made from galvanized steel sheet conforming to ASTM A 653 Class G 185. For Permanent Wood Foundations, use 304 or 316 stainless steel fasteners.


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Allweather Wood 815 S 32nd Street
PO Box 227
Washougal, WA 98671

(800) 777 8134 – Main Number
(360) 835 3692 – Fax

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