Floor Joist Size Calculator Uk

We have engineered this calculator to provide spans which will produce a solid built house with no bounce in the floors or any swags in the ceiling.

Floor joist size calculator uk.

The floor joist spacing is the distance between the centers of any two installed joists. Supporting imposed load. Also available for the android os. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.

See the image below for an example of joists spaced 16 on center 16 o c. The lowest is a plain ceiling joist with no storage 10 pounds per square foot. Span calculator for wood joists and rafters also available for the android os. Size of joists mm clear span c16 joist m clear span c24 joist m 47 x 95 47 x 120 47 x 145 47 x 170 47 x 195 47 x 220 1 77 2 40 2 89 3 38 3 87 4 36 2 04 2 75 3 47 4 20 4 93 5 66 floor joists flat roof joists assumptions at 400mm centers supporting permanent load excluding self weight of joists up to 50kg m2.

These tables can help calculate whether floor joists are strong enough to support themselves and the load they carry without the help of any walls underneath. Click on a span to generate a full calculation you can adjust the exact span. The highest is a fully loaded floor 70 pounds per. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.

Please get in touch with your local branch if you have any questions. This span table is to the format and methodology given in bs 5268 7 1. Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors. Looking at this table you will see there is a choice in the size of floor joist 2 x 6 2 x 8 2 x 10 or 2 x 12 and there is a choice in the joist spacing 12 16 or 14.

These spans were calculated using our floor joist calculation engine. Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. There are six choices. This is the distance between joist centres.