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Wood Preservative FAQ
What preservatives are used to treat pressure-treated wood?
What is CCA? What is ACQ? What treatment and retention level should I use for above-ground applications? What treatment and retention level should I use for ground-contact applications? What treatment and retention level should I use for freshwater contact?  What preservatives are used to treat pressure-treated wood? A wide range. The American Wood-Preservers' Association standards provide a complete list of accepted standard formulations in the US. Chromated Copper Arsenate (CCA), Alkaline Copper Quat (ACQ), Pentachlorophenol, Creosote and Ammoniacal Copper Zinc Arsenate (ACZA) are the most widely used systems. Back to Top What is CCA? CCA stands for Chromated Copper Arsenate, a wood preservative formulation containing copper, chromium and arsenic. The copper acts as the main fungicide and also provides some protection against termites. Arsenic provides protection against termites and copper-tolerant decay fungi. Chromium helps to bond and "fix" the chemical components to the wood. Back to Top What is ACQ? ACQ stands for Alkaline Copper Quat, a wood preservative formulation that contains copper and quaternary ammonium compound (quat) as active ingredients. Copper is a very cost-effective fungicide protecting against decay. It also provides some protection against termite attack. The Quat provides protection against termites and certain types of fungi that are tolerant of copper. Back to Top What treatment and retention level should I use for above-ground applications? Recommended retention for ACQ and CCA preservative treatments is 0.25 pcf. Back to Top What treatment and retention level should I use for ground-contact applications? Recommended retention for ACQ and CCA preservative treatments is 0.40 pcf. Back to Top What treatment and retention level should I use for freshwater contact? The same level of treatment as recommended for ground contact should be used for freshwater applications. The recommended retention for ACQ and CCA preservative treatments for this application is 0.40 pcf. Back to Top |
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