2x10 actual size how to#

By knowing the standard lengths available, builders are able to configure how best to place the floor joists. Normally, these are available in 8- to 16-foot stock lengths. This size is the size when the piece was graded, so if it dries out it will be a little smaller if it gains moisture, a little bigger. Floor framing requires 2-by-8, 2-by-10 or larger dimensional lumber. Incidentally, softwood pieces 1x12x10s are 0.75 x 11.25 x 10.0 actual size. To learn more about framing a floor and general information on floor framing, visit Framing a floor, on . For softwoods, the definition is for board feet measured to two decimals based on nominal size, not actual. To calculate maximum spans on species not shown above, use the Span Calculator or the Span Tables for Joists and Rafters on the American Wood Council website. To calculate maximum joist spans using different design criteria (loading, spacing, grade, etc.), for these common lumber species, see the International Residential Code (IRC). This product is third-party certified, signifying sourcing from renewable and environmentally managed forests.

The above spans are based on American Softwood Lumber standard sizes. Premium 2 and Better Douglas Fir Lumber meets high grading standards for strength and appearance, and is easy to cut, fasten and paint, making this the best choice for many building projects. Floor Joist Span Table Live Load = 30 psf, Dead Load = 20 psf

2x10 actual size how to#

Floor Joist Span Diagram How to use the Span TablesĮxample: In the joist span table below, the highlighted cell (10-5) indicates that a #2 grade 2' x 8' Douglas Fir joist, spaced 24' apart, can have a maximum span of 10 feet - 5 inches (10-5), if designing for a live load of 40 psf, a dead load of 10 psf, and a deflection limit of the total span in inches divided by 360.