Shed Wind Rating

Shed Wind Rating

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When buying a garden shed there are a few things you need to do before you even start shopping for one… things like measuring the available space, deciding on colour and doors and setting a budget. However, one of the most essential things you need to check, which is commonly overlooked… is what wind rating the area you live in has been assigned.

What is a ‘Wind Rating’?

It’s a rating, which is assigned by your council to a certain area based on the geographic region, shielding, topography and terrain. Some areas in the country or even your state will experience different levels of winds- some only a small breeze and others cyclones.

Why do I Need to Check My Areas Wind Rating?

See the photo? Thats yours answer.

Garden sheds can become very dangerous buildings during a windy storm or a cyclone. Even more so than your home at times.

Due to their lightweight, foundation, structure and material, if they are not built specifically endure the wind levels in your area then they can be a danger to you. These buildings can be ripped apart in storms if the wrong one has been installed and the pieces can cause damage to its surroundings and even cause death. So it is vital you do your research and purchase the correct shed for your area so you can avoid any of the above.

Australia and New Zealand both unique in their weather because they can experience a vast amount of different climatic conditions in many different parts of the country on the same day. There are states and or local areas which experience high temperatures or seasonal flooding, some which experience snow and others heavy rain. But what concerns us most in the Shed industry are those areas that experience high winds or cyclones.

By checking the rating of your area and buying a shed which is designed and engineered to withstand heavy winds, you are not only ensuring the lifetime of your shed but also protecting yourself, family and others in your area.

How Do I Find Out My Areas ‘Wind Rating’?

The wind rating of your area is determined by your

  • Geographic region ( Region A,B,C or D)
  • Shielding
  • Topography
  • Terrain conditions

You cannot make an estimate yourself based on past weather events in your area. It is recommended you check with your local council for the legally assigned rating to be safe.

This information that your local council will have, you can easily obtain by giving them a call. You will just need to give them your address to get the info (the address of the property you are planning to build the shed on).

To understand a bit more of what is considered for your wind rating, and also a few things you should keep in mind I have elaborated on the key areas below:

BY GEOGRAPHIC REGION

Each state has been allocated its areas of wind ratings, refer to the map above. Its common knowledge each state has its own weather conditions and exposed to differe tides, wind systems etc so its natural for the regions to differ too.

The further north of Australia you live, and coastal the more likely you will endure cyclones which means you may fall into Region C or D.

BY TERRAIN & SHIELDING

This is looking at your region, suburb almost and considering the type of terrain your home is surrounded by. You can picture a densely vegetated or residents can impact how much wind your home is exposed to.

For example, does your terrain have few or no obstructions. Most often this only exists for isolated houses in flat, tree-less or poorly vegetated plains with approx 10km of the flat surface surrounding. This is common in regional or outback regions.

You may in a category where you have some trees and objects around your property such as other buildings or homes too.

The more homes and dense your area is with terrian and buildings the less exposed you are to the wind. But you cant go by this alone. You need to consider the

BY TOPOGRAPHY

The topography gets a bit trickier as we are looking at your properties height, how it slopes and which way it faces.

You may be in a densely developed area but could be on a block still facing and exposed to wind or the opposite/ You may lower down compared to surroundings making your less exposed in general.

Often we have had customers who live in a low rated region but their home is exposed and can get gusts of heavy winds greater than average impact their terrain.

You can use this information to begin your research for your ideal Garden Shed and make an informed decision.

 


Cheap Sheds Wind Calculator

Cheap Sheds has also created a Wind Calculator for you to use so you can get a good idea of what your area has been classified as.

<< Click to Access Interactive Calculator>>


How Does it Help Me Choose a Shed?

Cheap Sheds is Improving Your Online Shopping Experience

Wind rating is classified with “N” or “C”. N stands for “normal” or “non – cyclonic” while C stands for “cyclonic”. This issue gets a little more complicated as some manufacturers still use the old “W” wind rating classification.

We have prepared a rough comparison table below for illustration purposes, to give you an idea on how the W rating compares to the C and N wind rating.

I hope that you’ll find it useful. We also displayed the Pa rating and the maximum wind speed that a certain classification can withstand to demonstrate it further.

Pa Rating Klm/hr N Value W value Water rating Ultimate
500Pa 103 N1 ……. 150Pa 700Pa
700Pa 123 N2 W33 150Pa 1000Pa
1000Pa 147 N3,C1 W41 150P 1500Pa
1500Pa 180 N4,C2 W50 200Pa 2300Pa
2200Pa 218 N5,C3 W60 300Pa 3300Pa
3000Pa 254 N6,C4 W70 450Pa 4500Pa


We have recently added a new shed to our range called the StormSHED by Durabuilt. It is at the moment the toughest Shed on the market specifically engineered for high winds.

The StormSHEDs are suitable for cyclone regions (Region D/Category 2) withstanding wind speeds up to 88 m/s (316 kph), compiling with W60 cyclonic conditions.

If you have any comments or questions about this topic please do not hesitate to leave them below and we’ll address as soon as possible.


 

2 Comments

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  • Les Mosley says:

    Hello There,
    just for you own benifit
    N and C ratings are no longer comparable as per AS4055 in cyclonic regions, your figures are correct for “N” ratings but regions C & D require higher ULS
    Uls for regions C & D are
    C1 2030
    C2 3010
    C3 4440
    C4 5990
    and if the window or door is within 1200mm of a corner in these areas the ratings change again, I suggest you get a copy of AS4055 for Regions C & D requirements
    W ratings no longer exist

    • Krisztian says:

      Thanks for the comment and update Les.
      We only talk about the W rating (still) as some manufacturers still use that and we get a lot of questions about it.

      We’ll have a look into the AS4055 for Regions C & D and update this post accordingly when we get to it.

      All of our buildings are being tested and certified according to regulations, it is just a metter of getting the information out to the public here on the Cheap Sheds Blog.

      Thank you for your contribution once again Les.

      Have a good day.

      Krisztian

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