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  • FloorJoist Span Tables—Calculator The floor joist spacing is the distance between the centers of any two installed joists. See the image below for an example of joists spaced 16" on center 16" o.c. . 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.

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  • how to calculate wood joist size Screwfix Community Forum May 01, 2008 & 0183;& 32;so dont buy 7x2 and go for 9x2 as said. cosworth, Apr 28, 2008 7. duders likes this. ecm New Member. simple formula to use. Makes me laugh when builders try to underspec floor joists, especially when the price difference between a piece of C24 9"x2" and C24 9"x3" is approx & 163;1/per m.

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  • Floor Joist Spans for Home Building Projects Today's Below is a table giving the minimum size floor joists needed for 16″ and 24″ on center o.c. spacing when using 2 lumber with 10 pounds per square foot of dead load and 40 pounds of live load. Yellow Pine Douglas Fir Redwood Hemlock, Spruce Western red cedar Eastern white pine; Joist Size 16″ o.c. 24″ o.c. 16″ o.c.

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  • 7 x 2FloorJoist Span DIYnot Forums My first floor Joists are 7 x 2" and are spaced every 280mm what is the maximum span of these as some of the joists mat be spanning 5.2 meteres without support. The reason I ask.. It appears a section of solid wall has been removed and a stud wall put up in its place with a double doorway. Now this would have supported a few of the floor joists