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Terrain category for sheds and garages
What is my Terrain Category?
Terrain Category is a measure of the wind-breaking effect of the terrain surrounding the site where you are building a shed. The more your building site is surrounded by trees, other buildings, etc. the less exposed it is to the full force of the wind. Below is a guide to assist you in your selection. If you are not sure of your terrain category, be sure to check with your local council.
When comparing shed prices be sure you check that other companies have given you a quote on your correct wind region and terrain category.

Terrain Category 2 - requires the strongest shed
diagram of terrain category 2.5
Open terrain, grassland with few, well-scattered obstructions having heights generally from 1.5 m to 10 m.
This is the most common terrain category for the likes of airfields and open farming land.
Terrain Category 2.5 - intermediate between 2 and 3
diagram of terrain category 2.5
Use this in semi-open terrain.
This condition is very common in rural areas. Terrain with few trees, isolated obstructions such as agricultural land, cane fields or long grass, up to 600mm high.
Reduces the design wind speed below Terrain Category 2.

Terrain Category 3 - requires least shed strength
diagram of terrain category 3
Terrain with numerous closely spaced obstructions 3 m to 5 m high such as areas of suburban housing.
This is the most common terrain category in suburban and wooded areas.
This will produce the least expensive shed.
 
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