What size joist for 18 foot span

No. 1 and No. 2 Grade of Douglas fir and maximum span floor joists - imperial units. Max. dead load (weight of structure and fixed loads) 10 lbs/ft2. Live load is Span (ft - in). Nominal Size 2 x 12, 12, 20' - 3", 18' - 7", 17' - 5". 16, 18' - 5. Find out the minimum size floor joists you need for building decks, sheds, or room ceiling) is known as the dead load and is commonly rated at 10 pounds per square foot. 2×12, 18′ 6″, 15′ 0″, 17′ 6″, 14′ 4″, 14′ 9″, 13′ 0″. Codes & Standards>; Calculators & Software>; Maximum Span Calculator for Span Calculator for Wood Joists and Rafters also available for the Android OS.

Since the example house we are designing for is 12 feet wide, we need to find, in the floor joist span table, a joist size and centering that can span 12' or wider. The minimum size joist to be used in deck construction depends on the number of In general terms, joists spaced 16 inches on center can span times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. Joist span tables - use these tables to determine lengths, sizes and spacing of ceiling joists. joist, with a grade of #2, and spaced 24" apart can have a maximum span of 10 feet - 0 inches (), if you are 2" x 6", 12, , , 11,

TABLE R(1) CEILING JOIST SPANS FOR COMMON LUMBER 16, Douglas fir-larch, SS, , , , Note a . a. Span exceeds 26 feet in length. No.1 2x6. SP. SPF. HF. 0. 5. No.2 2x6. SP joist and rafter span tables for specific grades of Southern Spans in the tables are listed in feet affect lumber strength and stiffness, such as knot size and. FLOOR JOIST TABLE. JOIST SIZE. JOIST SPACING. MAXIMUM SPAN. 2” X 6”. 12” ON CENTER. 10' - 0”. 16”. “ 9' - 1”. ”. “ 8' - 7”. 24”. “ 7' - 11”. 2” X 8”. Recommended floor joist spans depend on lumber species, lumber size, joist spacing, Figuring load capacities and picking the right floor joist sizes and spacing is a more is generally considered to be about 10 pounds per square foot. 2×12, 18′ 6″, 15′ 0″, 17′ 6″, 14′ 4″, 14′ 9″, 13′ 0″.