ISSUE #2 February 2017 V2622

Alternative Solutions for Energy Efficiency Compliance in Residential projects

Cost Effective compliant solutions

 

Energy efficiency compliance requirements for single dwellings (Class 1) have not changed fundamentally since the 2010 National Construction Code (NCC) was introduced.

 However, the results and outcomes delivered by the various methodologies can vary significantly.
 

 There are three pre-scribed methods to demonstrate compliance in the NCC, 6 stars or equivalent (state dependent) software assessment (NatHERS), Deemed to Satisfy elemental provisions (DtS) and Verification using a reference building (V2.6.2.2). 

Nationwide House Energy Rating Scheme (NatHERS)

 In recent years there have been significant changes to the NatHERS software, along with the introduction of modelling protocols which has affected the performance outcome for the software solution. This has been seen with a significant increase in the requirements for improvements above standard construction specifications to gain compliance.

Deemed to Satify elemental provisions

DtS elemental provisions are a very rigid set of guidelines and often buildings struggle to achieve compliance with the glazing calculator. This method will not allow trades between improvements because you need to comply with all the conditions prescribed and will not provide information about the level of performance. It simply provides a pass or fail mark. All the boxes are required to be ticked, therefore compliance is only meet when all separate requirements have been demonstrated.

 

Verification against a reference building (V2.6.2.2)

V2.6.2.2 is a combination of both methodologies mentioned, this solution delivers far more flexibility than each method independently.
 
There are several variables that might challenge the achievement of  energy efficiency compliance of your project,  it could be a design requirement, poor orientated block, site location or budget
This alternative solution involves quantifying the performance of the Dts compliant building in order to establish a benchmark for the proposed buildings performance, once known, the proposed building can be looked at holistically.

This will enable us to find a flexible and cost effective solution, trading insulation against window upgrades or design requirements to create an overall better performing building than the DtS benchmark. In order to have this assessment undertaken, an assessor must have a good understanding of the various software available and the NCC.

 

We have found that in most cases a better outcome can be achieved by looking at all three methods on your project, rather than tuning into just one method often resulting in compliance becoming difficult to achieve when it need not be. 

For more information about the various options give us a call.

Mark Clayton
Business Development Manager


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