How long mail takes is going to depend on many factors along the way. Many factors, indeed, though with regard to how long does priority mail take, the answer is, not long. In fact, the United States Postal Service says your package or envelope will arrive within two days.
Both the 2009 IRC and the DCA6-09 allow #2 southern pine 2x10s to span 13 feet 1 inch at 24 inches on-center at a design load of 50 psf. That means these joists can span the 12-foot depth of the deck, and the beam can be located at the perimeter. Nine joists will be needed for the 16-foot width.
Report Abuse. Using 2x6 floor joists, the average width of a 2x6 is 5 and 1/2 inches. The plywood floor is roughly 3/4 inches. The ceiling underneath the 2nd floor is covered in 1/2 inch drywall.est Answer: Use the span tables out of your local Building Code to determine the size of the joists you will require in relation to the span between supports. The National Building Code permits 2x6 @ 16 c/c to span 9' 5. If your span is greater you will most likely need 2x8 or 2x10.