Maximum Spacing Of Floor Joist

These spans were calculated using our floor joist calculation engine.

Maximum spacing of floor joist.

This span table is to the format and methodology given in bs 5268 7 1. The right spacing depends on the code requirements as well as the type of structure it is and the weight it. Floor joists are available in several depths and lengths that are sufficient for most residential and commercial building plans. 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.

Joist span and spacing is set by your local building code. The floor joist spacing is the distance between the centers of any two installed joists. Spacing is measured from the center of one joist to the center of the next. Joists that are closer together can support more weight which allows the joists to span a longer distance than joists spaced further apart.

Floor joist span tables for various sizes and species of wood. There are also several floor joist sizes and types used. 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. See the image below for an example of joists spaced 16 on center 16 o c.

There are three basic measurements used for floor joist spacing. The maximum span for a 2 x 10 floor joist is up to 21 feet depending on several factors. The typical engineered floor joist is made of lumber in the shape of an i thus commonly called an i joist. 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.

Click on a span to generate a full calculation you can adjust the exact span. I joists can be custom made for plans that require unusual sizes. 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. Additionally the load that the floor needs to support is also a consideration.

Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres. The maximum span distance for 12 inch spacing is greater by as much as 30 percent compared to 24 inch spacing. But larger is not always better when builders are constructing a home or adding a room addition. 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.

Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes.