Does treated wood corrode aluminum? Yes. Most of the new chemical treatments contain copper and should never come in direct contact with aluminum. Many contractors isolate aluminum flashing and trim from pressure treated lumber with building tape or house wrap.Click to see full answer. Moreover, can you wrap aluminum over treated lumber?You can’t wrap treated wood on your porch or screen room in aluminum. If so, count on replacing it in a few years after the chemicals from the treated wood cause a chemical reaction with the aluminum and it starts to corrode and flake away. If you have any bubbling spots on the aluminum, that’s an early sign.Likewise, can you use aluminum flashing with pressure treated lumber? Never use galvanized steel or aluminum flashing in contact with an ACQ pressure-treated wood ledger board because it will corrode. Copper works well because it is compatible with the chemicals used in commonly sold ACQ-treated lumber and is easy to bend. In respect to this, will treated lumber hurt aluminum? Aluminum has been the go-to flashing for decades, but contact with ACQ and CA preservatives corrodes the metal. Copper is ground into microscopically tiny particles and the manufacturers say the treated lumber is no more corrosive to aluminum building products than CCA lumber.Should I wrap pressure treated lumber?And because these new wood treatments are especially corrosive to aluminum, it’s best to use vinyl or copper flashing, or to wrap the wood in a protective rubberized membrane. Allow treated wood to dry thoroughly before staining or painting. Test dryness by sprinkling the wood’s surface with water.