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.
Floor joist spacing uk.
Spacing between joists when spacing your joist structure the maximum gap between joists from centre to centre should be no more than 400mm.
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.
Suitable for uk building regulation approval.
The right spacing depends on the code requirements as well as the type of structure it is and the weight it.
28mm thick deckboards can be laid on joists with 600mm spacing though for higher level decks this should be reduced to 500mm centres.
The spacing between standard joists will depend upon the thickness of the actual deck boards.
Calculate the maximum load in kilograms that one of your floor joists can support.
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 span table is to the format and methodology given in bs 5268 7 1.
This is the distance between joist centres.
These spans were calculated using our floor joist calculation engine.
Click on a span to generate a full calculation you can adjust the exact span.
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.
Usually 400 450 or 600mm but any value can be used up to 610mm max.
Properly spacing floor joists when framing an addition or whole structure is largely a factor of building codes.
The following table gives details of allowable spans and spacing between joists for the most common timber sizes used in floor construction.
There are three basic measurements used for floor joist spacing.
There are also several floor joist sizes and types used.
See the image below for an example of joists spaced 16 on center 16 o c.
The full version allows any size.
This demo version is fixed at 1m clear span.
The smaller joists will need supporting at shorter intervals than the 6x2 joists.
Spacing recommended is for domestic or light commercial use if in any doubt seek further professional help.
Domestic floor joist calculator.
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.
