The Steel Deck Institute (SDI) has issued a position statement regarding the corrosion of steel deck products in direct contact to pressure treated lumber.
The change in pressure treatment chemicals has lead to a dramatic increase in corrosion-related damage to metal products - including metal decks and fasteners. Lumber treated with the treatment products ACQ (Alkaline Copper Quat) and CA-A (Copper-azole) has been shown to be highly corrosive when in direct contact with sheet steel.
SDI hired Touchstone Research Laboratory Ltd. to test a variety of sheet products (G60 and G90 galvanized, shop applied white primer, and shop applied high-heat gray primer) with a barrier of either 30lb. felt paper or "water and ice shied."
SDI found that only the "water and ice shield" product offered a substantial improvement over direct metal to wood contact!
The corrosion affected all of the sheet steel products (G60, G90, shop painted, etc.,) therefore the barrier method appears to be the only option when pressure treated wood must be used in contact with metal decks/flashing, etc.
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