Aluminum fasteners should not be used with copper based treated lumber. For best results, use the same type of metal for fasters as the metal siding and trim: Hot Dipped Galvanized fasteners for Galvanized and Aluminum-Zinc Alloy metal, Copper fasteners for copper metal, and stainless steel for all metals including those at or below ground level. Stainless steel or hot-dipped zinc-coated galvanized steel are often used with treated lumber. Treated lumber installed higher than 18” above ground may be a lower retention.įasteners: Fasteners used with treated lumber should be corrosive resistant. 2”x_ skirt board or any board in contact with the ground should have a min. ACQ or CCA post should have a minimum preservative retention level of. CCA treatment may be used on lumber 5”x5” and larger posts in Post-Frame building use, but may not be permitted for residential decks, gazebos or playground equipment. Common preservatives are Alkaline Copper Quaternary (ACQ), Copper Azole (CA) and Chromated Copper Arsenate (CCA). Generally, any lumber within 18” from the ground should be treated. Pressure Treated Lumber: Treated lumber is primarily used for skirt boards and post. Post Frame buildings may often be built where “Pole Barns” are not permitted or zoned for. Pole Buildings use round poles whereas Post Frame Buildings use square or rectangular post, commonly 4x4, 4圆, 5x5, 6圆 or larger treated lumber or laminated columns. Pole Barn: The term “Pole Barn” is often used in place of “Post Frame” however there is a distinction between the two.
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