This is the fourth video in the series on the timber framing code.
Floor load width diagram.
1 psf lb f ft 2 47 88 n m 2.
8th sep 2011 03 37 pm.
1 ft 0 3048 m.
This results in the load diagram given in figure ta 2 14.
Maximum floor joist span for no.
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.
These diagrams may also be used to determine roof load width for floor joists.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
First floor live loads have higher requirements than second floor live loads 40 pounds per square foot vs.
Refer to figure 3 4 4 1 table a of the building code of australia.
For an internal bearer which i assume you aren t after it is the half span load in both directions.
Tile roofs impart a heavier dead load on the bearers than sheet roofs.
Dead load weight of structure and fixed loads 10 lbs ft 2.
Figure ta 2 14 load diagram for girder bc.
A room used solely for sleeping might need to carry only 30 psf whereas a garage floor over a basement would need 50 psf or higher.
This is referred to as the floor load width flw.
Live load is weight of furniture wind snow and more.
Where the bearer supports load bearing walls the type of roof covering also needs to be determined.
Depending on the floor live load you will need 2 x 240x45.
2 grade of douglas fir are indicated below.
An inaccessible attic space on the other hand might have a live load of only 20 psf.
To calculate your bearer size accurately flw needs to be taken into account as well as the live load of thr floor.
Flw is used to calculate the sectional size of.
Beam uniform load floor loading psf x tributary width ft beam b 3 6 8 tributary width.
Determination of roof load width.
Beam b 3 6 8 tributary width tributary area 18 ft 6 67 ft 120 ft2 tributary area beam span length x tributary width.
Supporting load bearing walls and lintels in lower storey load bearing walls.
Area 0 5 sqrt l 1 2 l 2 2 w c.
Calculating beam loading assume that the floor system must support.
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.
