What Size Floor Joist For A 12 Foot Span. This is the most common as the typical span is 15 feet. In this situation your floor joist will be required to be 12 or 24 inches apart on center.
13 rows In general terms joists spaced 16 inches on center can span 15 times in feet their depth in. Span tables for timber floor joists Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors. This is the most common as the typical span is 15 feet.
With these factors the lightest joist will have a maximum span of 17 feet 8 inches.
SPAN TABLES FOR JOISTS AND RAFTERS 3 AMERICAN WOOD COUNCIL Table 91 Required compression perpendicular to grain design values F c in pounds per square inch for simple span joists and rafters with uniform load. 2x8s are used frequently for these projects. Span tables for timber floor joists Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors. Two options that arise could be your wider 24 and your narrower 12 options for spacing.
