Ask AI: how many joist do i need for a 10'X10' deck?

To determine the number of joists needed for a 10' x 10' (120" x 120") deck, you'll need to consider a few factors: the joist spacing and the size of the lumber you are using. For a 10' x 10' deck, most common joist spacing options are 12", 16", or 24", measured from the center of one joist to the center of the next. The most popular choice is typically 16" spacing. The size of the lumber affects the load capacity, with larger lumber allowing for wider spacing. Let's consider you are using 2" x 6" lumber and 16" on center joist spacing: 1. Board length: 120" (10 feet) 2. Joist spacing: 16" on center 3. Conversion: 1 foot = 12 inches You'll also need one extra joist for the end. To calculate the number of joists: 1. Divide 120 inches by the 16-inch spacing: 120" / 16" = 7.5 (round up to 8) 2. Add one extra for the end: 8 + 1 = 9 You will need 9 joists for a 10' x 10' deck with 16" on center spacing using 2" x 6" lumber. Always consult local building codes and a professional contractor to ensure your deck is structurally sound and safe.