These spans were calculated using our floor joist calculation engine.
Floor joist span calculator uk.
Try our interactive span checker to find the posi joist suitable for your project.
This demo version is fixed at 1m clear span.
To use the joist span calculator below first select the species of lumber you will use for your construction project from the drop down list.
Use the joist span and spacing calculator below to plug in your desired type of wood the size of your joists and the required spacing between each joist.
You will be given a range of depths and centres that are available and also an indicative deflection result.
The full version allows any size.
Surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.
Use the span tables below to determine allowable lengths of joists and rafters based on size and standard design loads.
Usually 400 450 or 600mm.
Span calculator for wood joists and rafters also available for the android os.
Our floor joist span tables are based on loadings given in the newer amended version of bs 6399 1.
This span table is to the format and methodology given in bs 5268 7 1.
Designing with wood beam span tables.
Next use the buttons in the table to select the maximum length in feet or metres in brackets that your floor joists must span.
Also available for the android os.
Domestic floor joist calculator.
Floor joist span calculator.
You can also use the wood beam calculator from the american wood council website to determine maximum rafter and joist lengths.
There are six choices.
Suitable for uk building regulation approval.
The lowest is a plain ceiling joist with no storage 10 pounds per square foot.
Select the on center spacing for the joists.
The highest is a fully loaded floor 70 pounds per square foot.
Simply enter the required span to see a range of results that will work.
These span tables are the equivalent of other industry standard span tables and are calculated to the same standards.
This table uses commonly available uk regularised timber depths.
Species southern pine douglas fir larch hem fir spruce pine fir redwood western cedars ponderosa pine red pine.
This means that some values are slightly more conservative than span tables from other sources if those do not include the amended guidance.
This is how far apart they will be.
Calculations to bs 5268 2 2002.
1 enter joist details 1 1 span and joist spacing.
Most lay outs are on 16 so the field is pre selected.
