Suspended Floor Joist Spacing

This span table is to the format and methodology given in bs 5268 7 1.

Suspended floor joist spacing. Click on a span to generate a full calculation you can adjust the exact span. This will be slightly less than the length of the board. Domestic floor joist calculator. These spans were calculated using our floor joist calculation engine.

The most common option for your floor joist is your standard 2 6. Joist span and spacing is set by your local building code. Most lay outs are on 16 so the field is pre selected. Select the on center spacing for the joists.

Suspended ground floor with no partitions above. See the image below for an example of joists spaced 16 on center 16 o c. Sixteen inch oc spacing of ceiling joists made from 2 southern pine allows for a maximum 13 inch span length. All the figures are based on normal domestic floor loadings where the floor construction is typically 18 25mm floor boards sheets with up to 12 5mm thick plasterboard and skim underneath.

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. 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. This size is no longer acceptable when framing a structure. This is the distance between joist centres.

The span table for a 30 psf live load 10psf dead load floor indicates a required fb value of 1 315 and a minimum e value of 1 800 000. This is how far apart they will be. In the past 2x4s or 2x6s were sometimes used as floor joists. Usually 400 450 or 600mm but any value can be used up to 610mm max.

In buildings with basements the first level of floor joists serves the same purpose. Other factors also come into consideration when constructing the framework for your shed. Let s dive into some of those. What size floor joist do i need.

A 2 8 will provide a few. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres. Calculations to bs 5268 2 2002. To change it click on another option.

1 2 timber strength class and joist size. In this case your joists are adequate to support a 30 psf live load and 10 psf dead load. Enter a span for the joist. The floor joist spacing is the distance between the centers of any two installed joists.

In the example the joists have a spacing of 16 inches and a span of 11 feet 2 inches. Floor joists installed on second or third or higher levels double as ceiling joists for the level below. This will support a room ceiling that is 10 feet long on one side as in 10 foot by 15 foot or 10 foot by 17 foot rooms which is a standard dimension for many rooms in residential construction. If a room is 10 inside to inside and the joists are cut 10 7.