Issue 34 – December 2011
The Department of Building and Housing (the Department) has published Guidance on barrier design (www.dbh.govt.nz/guidance-information#barrier) that covers a range of materials now used for the construction of barriers. The new Guidance provides a clear guide on how to achieve the relevant Building Code performance criteria for barriers.
Aligned with latest Standards and building practice
The new Guidance aligns barrier design with the current Standards by incorporating loadings from AS/NZS 1170, Structural design actions. It also responds to current building practice – most barriers currently being built are of materials other than timber, such as glass, metal, and concrete.
B1/AS2 is no longer an Acceptable Solution from 1 February 2012
The Acceptable Solution B1/AS2 covers only timber barriers and is being withdrawn. This means B1/AS2 will no longer apply as an Acceptable Solution from 1 February 2012. B1/AS2 is based on loadings specified in the superseded NZS 4203:1992.
The new Guidance on barrier design addresses a range of areas including barrier geometry, loadings, deflection limits, and testing procedures to prove a design's performance. It provides information for barriers constructed of timber, glass, concrete, and metals, and includes a useful checklist for building consent application checking at the end of the document.
Guidance developed by industry specialists
The new Guidance has been developed by a working group of structural engineers and specialists from the design, manufacturing, and construction industries, in consultation with a number of industry participants.
Become familiar with the new Guidance
The Department encourages building consent authorities and designers to become familiar with the new Guidance on barrier design.
Summarised from information supplied by Department of Building and Housing, 22 November 2011.
- AS/NZS 1170 Set Structural design actions Set