How many joists do i need for a 12x16 deck | Joists size for a 12x16 deck | Joist calculation

How many joists do i need for a 12x16 deck | Joists size for a 12x16 deck | Joist calculation
To determine the number of joists needed for a 12x16 deck, you need to consider the spacing between the joists, which is typically 12, 16, or 24 inches on center (OC). The most common spacing for decks is 16 inches OC. Here’s how you can calculate it:
Determine the spacing between joists: Let's use the common 16-inch OC spacing.
Convert the deck length to inches: 12 feet = 144 inches.
Divide the deck length by the joist spacing: 144/16 = 9, Add one more joist to account for the end joist: 9 +1=10 joists.Therefore, you would need 10 joists for a 12-foot span.
Therefore, you would need 13 joists for a 16-foot span if you were laying them out parallel to the 12-foot dimension.
However, in practice, you usually span the joists across the shorter distance to minimize deflection. So, you would generally place the joists every 16 inches along the 12-foot side. Thus, you would only need 10 joists running the 12-foot span, spaced 16 inches apart, and they would be 16 feet long each.
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