Most commonly the roof s internal support structure is composed of a fairly complicated system of structural elements designed to manage the load from the roof.
Roof load width australia.
In this post we want to share a quick guide to australian roof types.
The calculation of load width and roof area supported is easily understood if you consider the load on a structural member.
Required size for a given span.
Roof load width rlw and floor load width flw can be determined from as1684 or from the images below.
In order to stay intact and in place a roof must be able to resist loads both permanent and temporary that are pushing.
Load limits on the roof of a building.
Roof load width rlw the other important consideration in determining timber lengths and sizes of your pergola is the size and weight of the roofing material the timber structure intends to hold up.
Study section 2 of the code and look at the figure 2 10 2 11 floor load width flw figure 2 12 ceiling load width clw and figure 2 13 2 16 roof load width rwl and.
Rlw is used to calculate the sectional size of some roof members and supporting wall.
Having such a diverse environment mean the needs for roofing materials vary.
The roof load width is half of the rafter span.
In the united states a run of 12 inches 1 foot is used and pitch is measured as the rise of the roof over 12 inches.
Roofs are under a lot of pressure.
Australia a country like no other boasting a topography that includes desert plains and vast outback ranges to dense rainforests and coastal seasides.
You would require three post to cover the 6 5 mtrs of beam length.
If you can source a beam of 6 5 mtrs long in one piece the size required would be 240 by 45 in f5 or f7 or mgp 10.
This is the sixth video in the series on the timber framing code.
Ask yourself what load is going onto a member.
The entire roof load is supported by load bearing walls which in turn transfer weight to the foundations of your home.
Roof pitch is the measurement of a roof s vertical rise divided by its horizontal run.
It is often compared to slope but is not exactly the same.
It should be noted that for engineering purposes in australia there are very few areas that are affected south of brisbane.
Spacing should be interpreted as the centre to centre distance between adjacent parallel members.
This video looks at roof load width rlw.
