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Floor Joists Floor joists are horizontally oriented beams that make a frame for building up a raised floor. Typically, they are spaced 16 inches apart on center. Some may be spaced 12 or 24 inches apart and supported by exterior walls and interior load-bearing walls. Floor joists are typically solid sawn from wooden 2×8, 2×10, or 2×12's.They must be precisely spaced otherwise you'll end up with sagging or uneven floors. They are normally set perpendicular to any load-bearing walls. Floor Joists