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Patio engineering specifications

Fully engineered by industry professionals

Easy to use Installation Details

Our drawings are fully engineered by industry professionals, easy to understand and utilise tek screwed connections (no welding required) for ease of installation.

Highly versatile with any sheet options including Colorbond, Cedar Lining and Cooldek, or other insulated sheeting.

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DIY Entusiasts

Council Approval Ready

Designed by Engineers

Design Quality

Our standard patio engineering tables and drawings are suitable for a wide variety of steel framed structures including gabled, hipped, curved, skillion and flat roofed patios and carports.

Designed to Australian Standards
& Ready for Council Approval

We provide you with standard engineering sets with all RHS and SHS steel sizes, spans and connections, drawn to BCA standards, so you can design and build the patio or carport you want. 

Our engineering details are ready for submission with your patio design for building licence approval through your local council.

All standard engineering sets are flexible in application.

All engineering sets contain spanning information for a wide variety of readily available steel sections enabling you to design a patio or carport with the beam spans and column spacings you require.

There are provisions for roof purlin overhang, counter levered edge beams and risers alongside existing structures. They offer the flexibility to accommodate a wide variety of sheeting options including varying profiles of Colorbond sheeting, Cooldek or Smartspan, insulated roofing, and cedar or other roof linings.

 

Ready for the wind in Northern Australian.

No matter where you are located in Australia, we have standard engineering details for your patio. We cover Regions A and D and wind speeds N1, N2, N3, C2, C3 & C4. Our wind classification guide will help you determine the engineering set you need for your area.

View our Wind Speed guide

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Do You Have Any Questions?

Simply get in touch and let us know that you are a tradesman and we can discuss options available trade discounts.

When you order your drawings you create an account with us. Within 24 hours of placing your order your drawings will be available to download. You can download them from your account page.

Simply upload your plans or get in touchand we can discuss your patio or carport requirements and deliver a custom DIY kit straight to your property. 

Australia is subject extreme weather so its important to build your patio with to survive the conditions in your region.  We’ve created a wind classification guide to help you.

If you’re still unsure, please consult a local engineer.
We understand that getting the right installer is important to safeguard your investment. We’ve compiled a list of preferred patio companies to help you find the right professional to install your patio.

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Do you have a set of plans for a specific DIY kit you want engineered and supplied, or a specific building problem not covered by our standard engineering set that needs a custom solution?

Get in touch to discuss how we can help you with your project.

More Questions? sales@patioengineering.com.au

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Courtney Lawrence
Home Builder

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Wind Speed Classification

Before erecting a patio, particularly in coastal regions in Northern Australia it is important to consider a range of factors: Region (Figure 1.0), Terrain Category (Figure 2.0), Shielding Factor (Figure 4.0), and Topographic Classification (Table 2.0).

For permissible gust wind speed refer to table (1.0).

This considers these four variables in accordance with the Australian Standard AS/NZS1170.2:2011.

Patio wind speed classification
Wind ClassificationGust Wind Speed
meters per second
Regions A & BRegions C & D
N1 (Non-Cyclonic)N/AW28
N2 (Non-Cyclonic)N/AW33
N3 (Non-Cyclonic)C1 (Cyclonic)W41
N4 (Non-Cyclonic)C2 (Cyclonic)W50
N5 (Non-Cyclonic)C3 (Cyclonic)W60
N6 (Non-Cyclonic)C4 (Cyclonic)W70
Wind speed regions
Figure 1.0
Topographic Classification
RegionTerrain CategoryT0T1T2T3
FSPSNSFSPSNSFSPSNSFSPSNS
A1N2N3N3N3N3N3N3N4N4N3N4N4
1.5N2N2N3N2N3N3N3N3N4N3N4N4
2N1N2N2N2N3N3N2N3N3N3N3N4
2.5N1N2N2N2N2N3N2N3N3N3N3N3
3N1N1N2N1N2N2N2N3N3N2N3N3
B1N3N4N4N4N4N5N4N5N5N5N5N5
1.5N3N4N4N3N4N4N4N4N5N4N5N5
2N3N3N3N3N4N4N4N4N4N4N4N5
2.5N3N3N3N3N3N4N3N4N4N4N4N5
3N2N3N3N3N3N3N3N4N4N3N4N4
C1C2C3C3C3C3C4C3C4C4C4C4N/A
1.5C2C3C3C2C3C3C3C3C4C3C4C4
2C2C2C2C2C3C3C3C3C3C3C3C4
2.5C1C2C2C2C2C3C2C3C3C3C3N3
3C1C2C2C2C2C2C2C3C3C2C3C3
D1C4C4N/AC4N/AN/AN/AN/AN/AN/AN/AN/A
1.5C3C4C4C4C4N/AC4N/AN/AN/AN/AN/A
2C3C3C4C3C4C4C4N/AN/AC4N/AN/A
2.5C3C3C3C3C4C4C4C4N/AC4N/AN/A
3C2C3C3C3C3C4C3C4C4C4C4N/A

The windspeed impact upon a structure is further influenced by the terrain it flows over. Sparsely populated, clear land provides less wind resistance than undulating land with a greater density of trees and structures.

Category 1 Terrain which is open with few obstructions (trees or man made structures); may include enclosed water surfaces, flat, treeless and poorly grassed plains, rivers or lakes with no buildings, or enclosed bays less than 10km in the wind direction.

Category 1.5 Larger open water surfaces including coastal waters, large open bays on seas, oceans or lakes, and enclosed bays less than 10km in the wind direction.

Category 2 Open terrain, including grasslands with fewer than two obstructions (1.5 to 5m high) per hectare.

Category 2.5 Terrain with isolated obstructions such as outer urban areas with scattered houses and few trees.

Category 3 Terrain covered with numerous obstructions that are closely spaced, with heights between 3 and 10m. For example suburban housing.

Wind speed terrain category
Figure 2.0

The windspeed impact upon a structure is further influenced by the terrain it flows over. Sparsely populated, clear land provides less wind resistance than undulating land with a greater density of trees and structures.

Category 1 Terrain which is open with few obstructions (trees or man made structures); may include enclosed water surfaces, flat, treeless and poorly grassed plains, rivers or lakes with no buildings, or enclosed bays less than 10km in the wind direction.

Category 1.5 Larger open water surfaces including coastal waters, large open bays on seas, oceans or lakes, and enclosed bays less than 10km in the wind direction.

Category 2 Open terrain, including grasslands with fewer than two obstructions (1.5 to 5m high) per hectare.

Category 2.5 Terrain with isolated obstructions such as outer urban areas with scattered houses and few trees.

Category 3 Terrain covered with numerous obstructions that are closely spaced, with heights between 3 and 10m. For example suburban housing.

Wind speed topographic effect
Figure 2.0
Note: Diagrams are applicable for hills up to 30m in height. Refer to AS4055-2011 for heights exceeding 30m.

The windspeed impact upon a structure is further influenced by the terrain it flows over. Sparsely populated, clear land provides less wind resistance than undulating land with a greater density of trees and structures.

Category 1 Terrain which is open with few obstructions (trees or man made structures); may include enclosed water surfaces, flat, treeless and poorly grassed plains, rivers or lakes with no buildings, or enclosed bays less than 10km in the wind direction.

Category 1.5 Larger open water surfaces including coastal waters, large open bays on seas, oceans or lakes, and enclosed bays less than 10km in the wind direction.

Category 2 Open terrain, including grasslands with fewer than two obstructions (1.5 to 5m high) per hectare.

Category 2.5 Terrain with isolated obstructions such as outer urban areas with scattered houses and few trees.

Category 3 Terrain covered with numerous obstructions that are closely spaced, with heights between 3 and 10m. For example suburban housing.

Wind speed topographic effect
Figure 2.0
Note: Diagrams are applicable for hills up to 30m in height. Refer to AS4055-2011 for heights exceeding 30m.
Wind speeds have been determined using the following factors, in accordance with AS/NZS1170.2:2011 500 year design return period and an average five metre structure height.
Note: A 5% allowance has been used when allocating the wind classification

Terrain Categories (MZ,cat)

Terrain CategoryRegions A, B, C, & D
11.05
1.50.98
20.91
2.50.87
30.83

Shielding Factor (MS)

Shielding ClassificationsFactor
Full Shielding (FS)0.85
Partial Shielding (PS)0.95
No Shielding (NS)1.00

Topographic Effect (MT)

Topographic ClassificationsFactor
T01.00
T11.10
T21.20
T31.30

Direction Multiplier (MD)
In all cases a factor of 1.00

The examples below show typical applications of the rationalised gust wind speeds. For a full analysis refer to AS/NZS1170.2:2011.
Wind speed examples
Wind speed examples 2

Disclaimer

Please Note: This document is provided as a design guide only. The information provided here is written in compliance with the requirements of AS/NZS1170.2:2011 and is classified in accordance with wind classifications allocated in AS4055:2012. Patio Engineering Australia does not accept any liability for any loss or damage that results from the misinterpretation of this design guide. When uncertain it is recommended to seek the advice of an independent engineer.