Domestic floor joist calculator.
Floor joist spacing uk.
The right spacing depends on the code requirements as well as the type of structure it is and the weight it.
There are three basic measurements used for floor joist spacing.
The spacing between standard joists will depend upon the thickness of the actual deck boards.
This demo version is fixed at 1m clear span.
The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.
The full version allows any size.
The smaller joists will need supporting at shorter intervals than the 6x2 joists.
Floor joist span tables for surveyors floor construction surveyors and structural engineers use data from tables below to help calculate the size of timbers necessary to give adequate support to timber floors.
Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.
This is the distance between joist centres.
Spacing between joists when spacing your joist structure the maximum gap between joists from centre to centre should be no more than 400mm.
The floor joist spacing is the distance between the centers of any two installed joists.
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.
Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes.
Spacing recommended is for domestic or light commercial use if in any doubt seek further professional help.
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.
Usually 400 450 or 600mm but any value can be used up to 610mm max.
28mm thick deckboards can be laid on joists with 600mm spacing though for higher level decks this should be reduced to 500mm centres.
These spans were calculated using our floor joist calculation engine.
Suitable for uk building regulation approval.
This span table is to the format and methodology given in bs 5268 7 1.
Calculate the maximum load in kilograms that one of your floor joists can support.
See the image below for an example of joists spaced 16 on center 16 o c.
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.
Joist span and spacing is set by your local building code.
For example if you have joists spaced 40 cm 16 inches on centre with a span of 4 2 metres 14 feet the load would be 462 kg 1 019 lb per joist.
Click on a span to generate a full calculation you can adjust the exact span.
