Typical Floor Joist Size. What size should floor joists be. At 16 inch spacing 15 feet 2 inches and 13 feet 3 inches at 24 inch spacing.
Ceiling joists are often made with 2 x 6 boards but can be as small as 2 x 4 or as large as 2 x 8. Solid-lumber joists in modern homes typically are 2 x 10 or 2 x 12 boards spaced at 16-inch intervals. Beams and Columns - Deflection and stress moment of inertia section modulus and technical information of beams and columns.
Older homes may have joists made of thicker but often narrower boards and may be spaced up to 24 inches apart.
Older homes may have joists made of thicker but often narrower boards and may be spaced up to 24 inches apart. Older homes may have joists made of thicker but often narrower boards and may be spaced up to 24 inches apart. Hemlock spruce and redwood have medium bending strength. Western red cedar Eastern white pine and ponderosa pine have low bending strength.
