Perservatative Treatment

Lumber and plywood treated with CCA preservatives for PWF construction must have a minimum .60 pounds of preservatives per cubic foot of wood.

(retention) .60

PWF, AWPA Standard C22.

All foundation lumber and plywood that is required to be foundation grade must be identified by a quality mark of an ALSC-accredited inspection agency.

All PWF lumber and plywood will have two stamps, Lumber Grade and Quality Mark.

Lumber cuts that are less than 8 inches from finish grade must be dip.

Foundation materials are dried after treatment. Plywood moisture content of 18% and lumber dried to 19% moisture content.