Wind Classification in your Area – a simple guide

This is a more difficult question to answer than most would think;What is the Wind Classification in your Area – a simple guide should help to find your answer.

Wind grade classification? What does it mean and how do I know what it is for my area? Well, there are many variables and it’s not quite as simple as “I live in Newtown so my classification is ..” ??. Knowing the wind classification for your area will help with choosing your shed or carport. A quick email or call to Professional Choice Sheds will put you in touch with a staff member who will have all the wind data for your area at their fingertips.

This article should help to find the wind grade classification on your site. Ultimately, it’s your local council that will give you a definitive answer for exactly what other factors must be considered for permission to insatll in your area, so check with them .

A wind classification is subject to many factors. Any shielding caused by man-made objects and/or structures, the nature of the terrain, and the region that the structure is located can have significant impact on the answer.

Shielding

The shielding of your building is a major factor in wind classification. A protected space in between homes will be quite different to a home on top of a hill in a paddock in the same area.

If it is in the middle of an open yard, standing alone, then the structure would need to be stronger than one located in a dense suburban area.

Generally, if the structure is near the coast then it would probably need to be stronger than one in a more protected inland area and neighbouring structures can also influence the wind updraft in some sites.

Terrain

Terrain is categorised in three categories;1, 2, and 3. The categories are important in identifying wind grade as wind is altered by the local terrain. Wind can be influenced and deflected by terrain and neighbourhood structures.

• The first Category 1 is exposed terrain
• the second Category 2 is open terrain with scattered obstructions, ranging in height between 0.5m – 5m.
• and Category 3 is terrain with numerous closely spaced obstructions – higher density urban areas usually with heights ranging from 3m-10m.

Region

The shielding of your building is a major factor in wind classification. A protected space in between homes will be quite different to a home on top of a hill in a paddock in the same area.

If it is in the middle of an open yard, standing alone, then the structure would need to be stronger one located in a dense suburban area.

Generally, if the structure is near the coast then it would probably need to be stronger than one in a more protected inland area. Neighbouring structures can also influence the wind updraft in some sites.

Australia is divided into classified regions. Regions are classified by maximum recorded wind speeds. Most of Australia is classified as region A; covering the south of the continent, the south generally including the southern coastal areas as well as the inland south so 90% of the population of the country will be classified in Region A.

Coastal New South Wales from around Port Macquarie and as far north as just south of Bundaberg is Region B. Around 100km inland in this are may be Region A.

Tropical cyclone areas mostly Bundaburg and north Region C. Again, around 100km inland in this area may be Region B.

Region D is the severe tropical cyclone areas including parts of the Western coastline of Australia.

This should help you understand your wind grade classification. If you are living in Australia, you have about a 90% chance of being in a category A area.

The map below is a very quick helpful guide. Most of the population Of Australia lives in Wind Region A (basically south of Port Macquarie on the mid NSW coast. Between Port Macquarie and roughly Bundaberg is Wind Region B and north of Bundaberg is cyclonic wind region C. Note, these only apply to the coastal region and the wind rating will drop from around 100km inland from these towns.

Now go back to the menu and look at the advantages of Professional Choice Sheds, Mezzanines, and carports.