Existing Floor Joist Load Calculation

Find the column for your dead load and spacing and the row for your timber size to find the permissible clear span in metres.

Existing floor joist load calculation.

462 kg 1 019 lb 1 72 square metres 18 7 sq feet 269 kg per square metre 54 5 lb per square foot. The full version allows any size. This sample table gives minimum floor joist sizes for joists spaced at 16 inches and 24 inches on center o c for 2 grade lumber with 10 pounds per square foot of dead load and 40 pounds of live load which is typical of normal residential construction. This number tells you how much load your floor can support for each square metre of floor space.

As shown in the example above existing ceiling joists are designed to withstand a much lighter load than a domestic floor load. The lowest is a plain ceiling joist with no storage 10 pounds per square foot. The highest is a fully loaded floor 70 pounds per square foot. Most lay outs are on 16 so the field is pre selected.

This demo version is fixed at 1m clear span. Divide the maximum load of one joist by the area supported by one joist. Also available for the android os. 2 dead load suspended ground floor with no partitions above 0 25 kn.

This is how far apart they will be. That means that the existing joists are not adequate to support a 40 psf live load. Select the on center spacing for the joists. Domestic floor joist calculator.

There are six choices. Generally these will have been designed to carry their own self weight and a plasterboard lath plaster finish. 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.

I don t know why you would want to apply the load at centre span. In the example the floor area of the room is approximately 112 square feet. Click on a span to generate a full calculation you can adjust the exact span. This figure is calculated as a dead load and a storage live load.

Calculations to bs 5268 2 2002. Multiply the maximum load per square metre by the total area of the floor. This span table is to the format and methodology given in bs 5268 7 1. 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. 1 enter joist details 1 1 span and joist spacing.