| Maximum Span (ft - in) | ||
|---|---|---|
| Nominal Size (inches) | Joist Spacing Center to Center (inches) | Lumber Grade |
| 2 x 8 | 12 | 13' - 1" |
| 16 | 11' - 11" | |
| 24 | 10' - 5" | |
What is the real size of a 2x8?
That means a 2 x 4 board is actually 1-1/2 inches by 3-1/2 inches. The larger 2x boards (2x8, 2x10, etc.) lose 3/4 inch in width. That means a 2x10 is actually 1 1/2 inch in thickness by 9 1/4 inches. See for Yourself On your next trip to Home Depot or Lowes, take along a tape measure and head over to the dimensional lumber aisles.
How far can a 2x8 span without support?
Joist, rafter, header, and beam spans are important structural factors, so if you’re wondering how far can a 2×8 span without support, we’re here to help. Span is determined by species, grade, dimensions, spacing, use, and load. A rule of thumb is 1.5 times a joist’s depth but in feet when spaced at 16” centers.
What is the true width of a 2x8?
2x8. 1-1/2 x 7-1/4. Click to see full answer. Correspondingly, how wide is a pressure treated ...
What size insulation for 2x8 walls?
What insulation fits in a 2x8 wall? Fiberglass R-19 batt insulation is about 6 inches thick and is available in 15-inch widths, making it the correct size for insulating a two-by-eight floor joist system. Full answer is here. Accordingly, can you put r30 insulation in 2x6 walls?
What Is Span in Building Construction?
Span is a term for the linear distance that a joist, rafter, or board can cover without bending or breaking without support.
What Factors Determine Span?
While there are maximum allowable spans, they are determined by various factors. Each factor can affect the span and should be taken into consideration for optimal support.
Conclusion
Knowing the allowable span as well as the factors that can affect it is crucial to building a sturdy structure. After selecting the species and the use, you also need to take the load, grade, and spacing into account to determine how far the 2×8 will span without additional support.
Joists & Rafters
Simplified maximum span tables for selected visual and mechanical grades of Southern Pine lumber in sizes 2×4 thru 2×12. Listed are 46 tables based on common loading conditions for floor joists, ceiling joists and rafters.
Headers & Beams
Simplified span tables for Southern Pine lumber and glued laminated timber (glulam) headers, beams and girders.
How far can a 2x8 span?
What is the maximum span for a 2x8 floor joist? In general terms, joists spaced 16 inches on center can span 1.5 times in feet their depth in inches. A 2x8 up to 12 feet; 2x10 to 15 feet and 2x12 to 18 feet. Click to see full answer.
How far can a 2x10 span without support?
Also Know, how far can a double 2x10 span without support? When supporting joists that span 12 feet with no overhang beyond the beam, a double ply beam can span in feet a value equal to its depth in inches. A double 2x12 beam can span 12 feet; a (2) 2x10 can span 10 feet and so on.
What is a joist in a deck?
Joists are the repeated structural members that are used to build a deck frame. The minimum size joist to be used in deck construction depends on the number of footings and beams that will be installed.
Can you stretch a string across a composite deck?
This can sometimes cause an uneven surface. That’s why stretching a string across the joist spacing for composite deck boards can help detect spots that may be higher than others. These spots can be addressed with a power hand planer to give you a nicer, smoother surface for the deck of your dreams.