As shown in the example above existing ceiling joists are designed to withstand a much lighter load than a domestic floor load.
Existing floor joist load calculation.
Select the on center spacing for the joists.
This demo version is fixed at 1m clear span.
In the example the floor area of the room is approximately 112 square feet.
This span table is to the format and methodology given in bs 5268 7 1.
Calculations to bs 5268 2 2002.
After you ve determined the load limit of your joists you can use that figure to determine the total acceptable load for the room or building in question.
The lowest is a plain ceiling joist with no storage 10 pounds per square foot.
Click on a span to generate a full calculation you can adjust the exact span.
These spans were calculated using our floor joist calculation engine.
Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.
Domestic floor joist calculator.
Span calculator for wood joists and rafters also available for the android os.
Live load psf dead load psf span calculator for wood joists and rafters available for the iphone.
That means that the existing joists are not adequate to support a 40 psf live load.
This figure is calculated as a dead load and a storage live load.
2 dead load suspended ground floor with no partitions above 0 25 kn.
462 kg 1 019 lb 1 72 square metres 18 7 sq feet 269 kg per square metre 54 5 lb per square foot.
This number tells you how much load your floor can support for each square metre of floor space.
1 enter joist details 1 1 span and joist spacing.
True floor joist span calculations can only be made by a structural engineer or contractor.
The load from the floor sheathing will continue to be transferred into the existing joist so continuous fastening between the joists is desirable to uniformly load the new joist.
Also available for the android os.
This is how far apart they will be.
Divide the maximum load of one joist by the area supported by one joist.
I don t know why you would want to apply the load at centre span.
Generally these will have been designed to carry their own self weight and a plasterboard lath plaster finish.
There are six choices.
The full version allows any size.
Most lay outs are on 16 so the field is pre selected.
Span calculator for wood joists and rafters also available for the android os.
