We do not recommend electro-galvanized screws (also called clear-zinc coated) for exterior applications. They will corrode quickly in contact with the elements. Mechanically galvanized screws are generally suitable for decks and other outdoor projects made of pressure-treated lumber.Click to see full answer. Correspondingly, what kind of screws can be used in pressure treated wood?The 2006 International Residential Code states, “Fasteners for pressure-preservative and fire-retardant-treated wood shall be of hotdipped zinc-coated galvanized steel, stainless steel, silicon bronze or copper. The coating weights for zinc-coated fasteners shall be in accordance with ASTM A153.Beside above, can you use composite deck screws on pressure treated wood? Not really. For wood decks (pressure treated and cedar) it depends on whether or not you choose to screw or nail the decking down. The head of these screws are coated to match the most popular tones of composite – including grey, sand, red and dark brown. Also know, can I use drywall screws in treated wood? It is a very bad idea to use dry wall screws with treated lumber. There are certainly ASTM codes which set out the coating specifications for certain types of fasteners to be used with ACQ treated lumber. They should also come back and remove the drywall screws and replace them with an ACQ compatible screw.What are the best deck screws for treated lumber? Best Deck Screws for Pressure Treated Wood #10 x 2-1/2″ Stainless Steel Deck Screws, (350 Pack, 4.2 lb) Star Drive T25, Type 17 Wood Cutting Point, 18-8 (304) Grade Stainless Steel, by Eagle Claw Tools and Fasteners. The Hillman Group 47694 6-Inch x 2-Inch Galvanized Deck Screw. Galvanized Dual Torq Deck Screw #8 x 1-1/4″
