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To calculate the number of screws required for a deck, follow these steps:
1. Determine the deck size: Measure the length and width of the deck in feet.
2. Calculate the square footage: Multiply the length by the width to get the total square footage of the deck.
3. Decide on the spacing between each screw: Typically, a spacing of 6 inches is recommended for deck screws.
4. Divide the square footage by the spacing: Divide the total square footage by 6 to get the approximate number of screws needed.
5. Account for extra screws: It’s always a good idea to add a few extra screws for unforeseen circumstances or replacements.
6. Round up: Round up the number to the nearest whole number to ensure you have enough screws.
By following these steps, you can accurately calculate the number of screws required for your deck project.
Every deck construction project requires a sufficient amount of screws, but the calculation depends on a bit of mathematics. The quantity of screws needed relies on the deck’s square footage, the spacing between joists, and the width of the boards. It is always advisable to have more fasteners than anticipated, as it is almost impossible to complete a deck project without misplacing a few screws along the way.
Basic Calculation for Deck Screws
The number of screws required for a deck is determined by the deck’s square footage and several other factors. The spacing between joists is also crucial as the screws are inserted through the deck boards into the joists. Additionally, the width of the deck boards matters, as 4-inch-wide boards require more screws per square foot compared to 6-inch-wide boards, since each board must be securely fastened to the joists.
For optimal results during the installation of the decking, it is recommended to use two screws per joist on each board, with the screws placed consistently 3/4 inch to 1 inch from each side of the board to avoid splitting the wood. If a deck board spans five joists, ten screws are necessary. Maintaining uniform spacing on all boards ensures an aesthetically pleasing deck. Randomly installed screws that are not in straight lines will not result in a professional-looking job.
On average, expect to use 350 screws per 100 square feet when using 6-inch-wide deck boards with joists spaced 16 inches apart. For the same joist spacing, 480 screws are needed for 4-inch-wide deck boards. Use corrosion-resistant deck screws that are 3 inches long, or screws long enough to sink 1 1/2 inches into the joists below. To prevent board splitting, drill pilot holes near the ends of the boards. Slightly countersinking the screws ensures that the screw heads do not protrude from the deck.
Fasteners for Deck Foundation
Determining the number of fasteners required to build a deck frame or foundation is slightly more complex, as it depends on the number and thickness of the posts, the type of joist hangers utilized, and the overall design and size of the deck. Similar to the boards on top of the deck, the number of screws needed increases if the joists are spaced closer than 16 inches, although 16 inches is the standard. It is advisable to consult with the local building department for specific regulations that may impact the design and consequently, the number of fasteners required. For example, constructing a deck frame in an earthquake-prone area or on a slope requires different specifications compared to building a low-to-the-ground deck that resembles a platform.
Some joist hangers may require specific types of fasteners, and the screws utilized for the deck frame or foundation are generally not the same size or type as those used for the surface deck boards. Nails or structural screws designed to prevent wood splitting are typically used for the framing.
