Please note - These files will open in a new window, and play on Windows Media Player.
Click on the link to watch Roller Door installation Video
Click the "Back" button to return here.
It is very important that all considerations of your particular building site are considered when choosing a shed. If your shed does not have the appropriate wind rating for your site it could become dangerous during a weather event. or if it is overdesigned, you end up throwing away good money that could have been spent elsewhere. Your area of the Australian continent might well be a general wind rating as shown above, but your block may either be on the high, middle or low end of that general wind rating, depending on local topographical influences and then your actual site might may or may not be shielded from surrounding buildings and hills. The point is, that there are more localised influences to consider and if you don't take these into account you may over-design your shed you end up paying more than you have to and if you underdesign it its not going to last very long. Here is a good example:
This shed has to be stronger at the top of the hill than it does at the bottom. The boffins at the Australian Steel Institute (ASI) and James Cook University have done tests which prove it.
Here's another good example:
The shed in between the houses is not going to have to be as strong as the one in the paddock because the winds or storms will hit the houses to either side and deflect over the top of the shed, its a bit like aerodynamics with a car or plane.
So what does this mean to you? The council will tell you what you need, right? Well, not always, They may tell you something like W41 or N3 or N2 which is a general rating that we spoke about at the start, and is more appropriate to houses than to shed (structural steel) design. Some councils are quite good and are up to date with the latest standards while others, sadly are not. The latter seem to pass just about anything as long as it has a general wind rating on it which won't help you when your shed ends up in the lounge room during a storm and your shed contents are ruined and the insurance company won't pay out. It can only takes a gust, or a short blast of wind to blow something apart and it can come without any warning. So what can you do about it?
For a start, you should stay clear of any shed company who only gives you a quote with a "N" or a "W" value on it. The values are now out of date so it means nothing. That's what we at Dinky Di call old school. The design and therefore the written quotation must list the Terrain and Topography value used that we mentioned above, as well as the ShieldingandImportance Value. All of those things go into a mathematical enginering calculation that produces the correctly designed shed for you. A good company will be happy to help you with these considerations and also provide a full set of individual calculations to prove how they arrived at the engineering outcome for your shed.
Make sure that you tell your salesperson about your building site and how exposed or shielded it is from the general elements. If the companies salesperson does not care about that, or supply those details on the quote then you should probably not consider that one for purchase.
Below is some literature released by the Australian Steel institute regarding proper shed design.