This video looks at floor load width flw.
Floor load width diagram.
Refer to figure 3 4 4 1 table a of the building code of australia.
Supporting load bearing walls and lintels in lower storey load bearing walls.
This results in the load diagram given in figure ta 2 14.
The bearer span non loadbearing single or continuous is determined from the floor load width flw which for an external bearer will be half the joist span.
Beam b 3 6 8 tributary width tributary area 18 ft 6 67 ft 120 ft2 tributary area beam span length x tributary width.
Depending on the floor live load you will need 2 x 240x45.
Flw is used to calculate the sectional size of.
In order to use the table select the floor load width from among the top line of the table in this case 1200mm 1800mm etc our example is 2m 2000mm and use the corresponding column 2400mm below to select the appropriate size of bearer from the list on the left and the post spacing measurement to match from within the column.
Live load is weight of furniture wind snow and more.
Determination of roof load width.
This is the fourth video in the series on the timber framing code.
These diagrams may also be used to determine roof load width for floor joists.
Tile roofs impart a heavier dead load on the bearers than sheet roofs.
Area 0 5 sqrt l 1 2 l 2 2 w c.
But a single span of 3800 with a flw of 2400 and joist spacings at 450 no roof loads you could get away with 1 x 240x45 f27 kiln dried hardwood.
Beam uniform load floor loading psf x tributary width ft beam b 3 6 8 tributary width.
8th sep 2011 03 37 pm.
1 ft 0 3048 m.
Maximum floor joist span for no.
An inaccessible attic space on the other hand might have a live load of only 20 psf.
This is referred to as the floor load width flw.
For an internal bearer which i assume you aren t after it is the half span load in both directions.
Calculating beam loading assume that the floor system must support.
To calculate your bearer size accurately flw needs to be taken into account as well as the live load of thr floor.
2 grade of douglas fir are indicated below.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Alternately you can find w c by recognizing that the load on the girder has a triangular distribution and then set up the expression that equates the tributary load to the shape of the load diagram.
Figure ta 2 14 load diagram for girder bc.
Where the bearer supports load bearing walls the type of roof covering also needs to be determined.
