A wide range. 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.
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. Recommended retention for ACQ and CCA preservative treatments is 0.25 pcf. Recommended retention for ACQ and CCA preservative treatments is 0.40 pcf. The same level of treatment as recommended for ground contact should be used for freshwater applications.