Ground Floor Joist Spans

2 grade of douglas fir are indicated below.

Ground floor joist spans.

Dead load weight of structure and fixed loads 10 lbs ft 2. Don t worry you won t need to do a lot of calculations in determining the size and placement of the structural framing within your house design. Joist span and spacing is set by your local building code. Live load is weight of furniture wind snow and more.

1 ft 0 3048 m. 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. 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. Residential structural design vertical structural forces we were about to start learning about floor joist span tables.

Maximum floor joist span for no. Using floor joist span tables. When building a house or even a deck it is important to confirm you have the correct joist sizes spans and spacing before you get started. 1 psf lb f ft 2 47 88 n m 2.

True floor joist span calculations can only be made by a structural engineer or contractor. Continuing on from part 1. In typical deck construction with a ledger on one side of the joist and beam on the other the size of the joists is driven by the size of the deck and based on the general maximum spans mentioned above. While most residential construction uses 2x8 joists with 16 inch spacing there are many other factors you need to consider when determining the proper joist span length.

For best results refer to our wood and composite deck joist span table.