Poplar Floor Joists

All were air dried.
Poplar floor joists. Sometimes you can obtain some of this beautiful magnificent wood from older buildings that are being taken down or remodeled. Roof rafter span use this table to determine the maximum lengths of roof rafters based on species and grade of lumber spacing dimensions load and slope. Also available for the android os. The width of a board is an important factor in determining the distance a floor joist can span playing a much larger role than the thickness.
Span calculator for wood joists and rafters also available for the android os. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. True floor joist span calculations can only be made by a structural engineer or contractor. Floor joist span use this table to determine the maximum lengths of floor joists based on species of lumber joist spacing and joist size.
For example if you double the thickness or number of joists in a floor the distance the boards can span will increase by approximately 25. I would discourage cutting smaller dimensions in poplar as it does warp easily i e. I used 2x8 poplar for most of my floor joists. In previous decades heart pine was sometimes used for the beams or floor joists in such buildings.