Originally Posted By: roconnor
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I think they mean CCA treated lumber (CCA stands for Chromated Copper Arsenate). It was an extremely common preservative for pressure treating lumber for the longest time, and was only recently replaced by a newer preservative called ACQ. But ACQ has it’s own problems … like corrosion of fasteners, unless stainless steel or heavy hot-dip galvanized screws and nails are used.
I understand that the biggest concerns were handling and cutting CCA treated lumber, and it could give ya some pretty nasty splinters (originally banned for playground equipment and benches, then almost totally replaced by ACQ). But who really knows for sure. These sites have some pretty good info:
Robert O'Connor, PE
Eagle Engineering ?
Eagle Eye Inspections ?
NACHI Education Committee
I am absolutely amazed sometimes by how much thought goes into doing things wrong