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Floor Joists. The floor joists comprise the bulk of the floor thickness. Standard floor joists are usually 2-by-10 or 2-by-12 dimensional boards, installed on edge. The actual width of those boards, however, isnât identical to what their name implies.A 2-by-10 joist is really only 9 1/4 inches wide and a 2-by-12 is only 11 1/4 inches wide, so depending upon which size joist the blueprints call for, they will add the respective measurement to the thickness of the floor.Subflooring only adds 3/4 inch to the floor thickness.he actual width of those boards, however, isnât identical to what their name implies. A 2-by-10 joist is really only 9 1/4 inches wide and a 2-by-12 is only 11 1/4 inches wide, so depending upon which size joist the blueprints call for, they will add the respective measurement to the thickness of the floor.
Below is a table giving the minimum size floor joists needed for 16â³ and 24â³ on center (o.c.) spacing when using #2 lumber with 10 pounds per square foot of dead load and 40 pounds of live load. You can always use bigger lumber, closer spacing, or a smaller span; just donât go smaller, further apart, or a longer span.oist Span. Putting all these factors together gives the minimum size joists needed for various types of wood, grades of lumber, sizes of boards, spacing of joists, and the load that will be placed on the floor.