Structural screws are an ideal choice for deck construction and make a great substitute for traditional flat head screws. These construction screws can be drilled directly into the material without having to drill a pilot hole first, providing a stronger connection than traditional wood screws. At the very least, all structural hardware for decks must be made of hot-dipped galvanized steel. For treated wood, G-185 galvanized or polymer-coated steel is recommended.
For marine or humid environments, contact with the ground, or exposure to salts or other corrosive chemicals, stainless steel is the best option. When installing composite deck screws, it's important to not drive them too quickly or sink them too deep into the platform. Ultimately, deciding which fasteners to use when building your deck will depend on your budget and personal preferences. Platform screws are specifically designed to withstand anything Mother Nature throws at them and are the best option on the market today.
They have special thread designs and concave “pancake” shaped heads that leave a sharp hole in the surface of the deck without the typical wrinkling of excess material (fungus formation) around the screw head. Composite deck screws also have special thread designs designed to reduce the need to pre-drill and tighten the platform to the frame. Nails are not recommended for roofing projects, so it's best to opt for deck screws instead. Therefore, a joist hanger on a seaside deck will rust much faster than the same piece of hardware on a completely dry deck in Arizona. For extreme conditions (and big budgets), Starborne manufactures the HeadCote line of composite screws for stainless steel decks, available in colors that match many roof products.
For most installers, the biggest concern with hidden platform fasteners is whether they are strong enough to withstand the tendency of deck boards to bow, warp, or move. Give your deck a solid and durable base by choosing the best fastening option for your needs.
