Page 53 - Build 161

Deemed to comply
Compliance paths 6–9 are deemed-to-comply compliance paths. If followed to the letter, the work must be accepted as Code compliant by a building consent authority (BCA).
Alternative method
Options 1–5 can be used where an alternative method is proposed. An alternative method becomes an Alternative Solution once it has been consented as being Code compliant by the BCA.
Typically, an alternative method will be needed when the design is not following a Veri cation Method or an Acceptable Solution. Support must:
● bedirectlyrelevanttotheprojectanditssituation
● clearlyidentifyanyvariationsfromreferencedocumentation
● beincludedintheconsentdocumentation.
Demonstrating compliance
Several BRANZ resources can be used to assist in demonstrating building compliance in support of a building consent application.
The resources vary widely from web-based calculation tools through to published works.
Web-based calculation tools
BRANZ calculation tools can be found on the BRANZ website (www. branz.co.nz) in the Toolbox:
● TheLintelsandBeamsCalculatorallowsbeamsizestobecalcu- lated for spans and materials outside the scope of NZS 3604:2011 Timber-framed buildings. An example is a steel or glulam lintel over a 4.5 m wide opening (NZS 3604:2011 tables for lintels are limited to a 4.2 m span and only cover standard framing timber sizes). The key proviso when using the tool is that the building itself must fall within the scope of NZS 3604:2011. A producer statement to support the calculation can be printed o when purchased.
● ALF 3.2 is a free online aid to the thermal design of houses. It is presented in a step-by-step format providing a simple method of calculating the energy performance of conventional New Zealand houses. ALF 3.2 is a Veri cation Method for determining the Building Performance Index (BPI), which can be used to show compliance with the energy e ciency clause H1 of the New Zealand Building Code. If the calculated BPI is less than 1.55, the building complies with the requirements of clause H1.
● NZS 4218:2009 Calculation Method Tool is a free tool that can be used to demonstrate compliance with Building Code clause H1 when using the NZS 4218:2009 calculation method.
● BRANZP21testcanbeusedtodeterminethecapacityofsheetwall bracing elements for use with timber framing.
Expert evaluation and testing
There is further expert advice from BRANZ:
● BRANZ Appraisals – robust, in-depth independent evaluations for
Two Stage
Level Threshold Drainage System
The Accrete Design Level Threshold Drainage System is fast becoming the product of choice when choosing a level threshold system.
Why? Because:
• it’s easy to install (less labour time means less cost)
• it captures stormwater and cladding water
• it’s manufactured from 316 Stainless Steel
• top and bottom grates are easily removed for cleaning
and maintaining the bottom edge of cladding
• it’s custom made to suit any specification
• lead times are quick from manufacturing to delivery.
For further information contact Kirstie Brown: P: 04 586 9944
E: [email protected]
For more bene ts and features visit:
www.accrete.co.nz
building products and systems to be deemed t for purpose and
Build 161 — August/September 2017 — 51
Series 2