E: info@deltapanels.com      Head Office: 731 Boundary Road, Richlands, Qld 4077    +61 7 3271 2170
 W: www.deltapanels.com     Sydney Depot:  11 The Old Northern Road, Narellan, NSW 2567   +61 2 4611 7712
ABN: 11 147 861 292
Version Date: 
2025-11-25
12
STEP 1         DETERMINING CORRECT WIND SPEED
Step 1.3        Shielding Determination
Full Shielding
FS
Partial Shielding
PS
No Shielding
NS
At least 2 rows of housing or similar size permanent structures surround the intended construction 
site. In Regions A & B, heavily timbered areas provide full shielding as long as they are within 
100 metres.
Full shielding is only possible for houses within Topographical Classes T0, T1 and T2. The Full 
Shielding classification is only applicable to suburban developments with 10 or more houses 
and or similar sized structures, per hectare. The effects of roads or other open spaces within a 
distance of 100 metres in any direction are exempt.
Partial shielding is only possible for houses within Topographical Classes T0, T1,T2 and T3.
To qualify there is a requirement to have at least 2.5 houses per hectare or equivalent structures 
situated upwind of the intended building location. This is typical of an acreage estate or housing 
based at the 2nd row from open water, abutting parklands or airfields.
This would be houses located on the edge of housing estates, the side of open water, airports, 
sporting fields and large open parklands.
The shielding effect of established trees and established building structures will have an effect on the upward wind pressures. 
With the exception of regions C & D where trees are not considered a shielding element. 
The 3 shielding classifications are:-

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