Floor Joist Size Calculator Uk

Span calculator for wood joists and rafters also available for the android os.

Floor joist size calculator uk.

This is the distance between joist centres. 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. Please get in touch with your local branch if you have any questions. Click on a span to generate a full calculation you can adjust the exact span.

Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads. You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths. See the image below for an example of joists spaced 16 on center 16 o c. Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.

Supporting imposed load. Oxford 01865 326500 swindon 01793 484455 or yarnton 01865 842574. 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. This span table is to the format and methodology given in bs 5268 7 1.

These spans were calculated using our floor joist calculation engine. Usually 400 450 or 600mm but any value can be used up to 610mm max usually 400 450 or 600mm but any value can be used up to 610mm max 1 2 timber strength class and joist size. The highest is a fully loaded floor 70 pounds per. The floor joist spacing is the distance between the centers of any two installed joists.

Decking calculator please use our calculator below to help you estimate how many decking boards and joists you will need to create your deck. There are six choices. 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. Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.