Foundations made of treated wood, either chromated or ammoniacal copper arsenate (CCA or ACA), just eat fasteners. Even hot-dipped galvanized (next best) react under wet conditions or if the coating is chipped or cracked, as often happens from hammer blows. The only sure way to avoid problems is to use stainless-steel nails.
Also excellent for decking.
Quantity given is approximate nail count per 1 lb box.
Made in USA.