The durability of yellow-poplar and American beech treated with chromated copper arsenate

Durability of yellow-poplar and American beech treated with chromated coppe r arsenate (CCA) was evaluated in field plots in West Virginia and Mississi ppi. Stakes were vacuum-pressure treated with CCA Type-C (CCA-C) to several retentions and placed at the test sites. Stakes were evaluated yearly acco rding to American Wood Preservers' Association standards. The 5-year result s suggest that use of heartwood, but not sapwood, of these two species trea ted to a retention of 0.60 pcf (9.6 kg/m(3)) is justified when a use-life o f 5 years is acceptable. Stakes of all wood species (American beech, yellow -poplar, and southern yellow pine) treated with CCA-C exhibited an increase in durability performance with an increase in retention.