Maximum Spacing Of Floor Joist

See the image below for an example of joists spaced 16 on center 16 o c.

Maximum spacing of floor joist.

The maximum span distance for 12 inch spacing is greater by as much as 30 percent compared to 24 inch spacing. The floor joist spacing is the distance between the centers of any two installed joists. Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes. The maximum span for a 2 x 10 floor joist is up to 21 feet depending on several factors.

Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres. 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. Joist span table use these tables to determine floor joist spans based on grade of lumber size of joist floor joist spacing and a live load of 30 lbs ft 2 or 40 lbs ft 2 these tables can also be used to determine deck joist span. Floor joist span tables for various sizes and species of wood.

Floor joists are available in several depths and lengths that are sufficient for most residential and commercial building plans. Common sense tells you that large floor joists can carry more load and spacing joists closer together also increases the load bearing capacity of a floor. Since the example house we are designing for is 12 feet wide we need to find in the floor joist span table a joist size and centering that can span 12 or wider. I joists can be custom made for plans that require unusual sizes.

Click on a span to generate a full calculation you can adjust the exact span. There are three basic measurements used for floor joist spacing. Floor joist table joist size joist spacing maximum span 2 x 6 12 on center 10 0 16 9 1 19 2 8 7 24 7 11 2 x 8 12 on center 13 2. This span table is to the format and methodology given in bs 5268 7 1.

But larger is not always better when builders are constructing a home or adding a room addition. One must take into consideration the spacing of the joists and type of wood used. The extra two inches of vertical distance when a floor is framed with 2 x 10 joists rather than 2 x 12s can be quite important for example. Joists that are closer together can support more weight which allows the joists to span a longer distance than joists spaced further apart.

Additionally the load that the floor needs to support is also a consideration. There are also several floor joist sizes and types used. The right spacing depends on the code requirements as well as the type of structure it is and the weight it. These spans were calculated using our floor joist calculation engine.

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.