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Hoop iron bracings Requirements for compliance

Bracing is used to enable a building’s roof, wall and floor to resist horizontal forces applied to that building. It is therefore important that the type of bracing used will resist those forces. Hoop iron bracing is a common form of bracing material, so how do you tell if the products you’re using are correct for use as a structural brace or tie down – and that they comply with relevant Australian Standards?

NCC evidence of suitability

Part A5 of the National Construction Code (NCC) specifies the different methods of evidence of suitability you can use to demonstrate that materials/products will meet NCC requirements. One such method is a product technical statement. This statement is provided by the manufacturer and will specify the product, how and when it can be used and the performance requirements or relevant standards it satisfies. 

If there is no detail on the product packaging request a copy of the product technical statement and check the kN capacity to determine that it meets the requirements of AS 1684 Residential Timber Framed Construction.

AS 1684 requirements

The AS 1684 Standard requires that the nominal size for metal straps be 30 x 0.8mm GI. The minimum grade of steel strap is to be G300 (AS 1397 Continuous hot-dip metallic coated steel sheet and strip) and have bracing capacities of 1.5 kN/m for a tensioned metal strap and 3.0 kN/m for a tensioned metal strap with stud straps.

 Structural Bracing Metal strap 25 x 0.8 mm or 30 x 0.8 mm thick without stud straps
Australian Standard  Reference in Standard  Bracing capacity kN/m or Bracing Type  
AS 1684.2 (non-cyclonic)  Table 8.18 (b)   1.5
AS 1684.3 (cyclonic)  Table 8.13 (b)   1.5
 AS 1684.4 (non-cyclonic)  Table 8.3 (b)  A

The bracing capacity in the above table is appropriate for wall heights up to and including 2700mm.

Table 8.18B
Structural Bracing Metal strap 30 x 0.8 mm thick with stud straps
Australian Standard  Reference in Standard  Bracing capacity kN/m or Bracing Type  
AS 1684.2 (non-cyclonic)  Table 8.18 (b)  3.0
AS 1684.3 (cyclonic)  Table 8.13 (b)   3.0
 AS 1684.4 (non-cyclonic)  Table 8.3 (b)  B

The bracing capacity in the above table is appropriate for wall heights up to and including 2700mm.

Table 8.18D
To ensure your frame and, in turn, your bracing meets the relevant timber framing standards requirements, note that you must also use the correct bracing materials.

To find out more, contact HIA’s Building Services team.

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