The focus of this video is the energy efficiency provisions in NCC Volume Two and the related Housing Provisions.


Slide 1:

Welcome to using the energy efficiency provision in NCC Volume Two.

Slide 2:

The focus of this presentation is the energy efficiency provisions in NCC Volume Two and the related Housing Provisions. This presentation has a practical focus and looks in detail at the specific Performance Requirements, DTS Provisions and Assessment Methods for energy efficiency that apply to Class 1 and Class 10 buildings.

Slide 3:

What you will learn. Energy efficiency Performance Requirements in Volume two, compliance solutions for energy efficiency In Volume two, house energy ratings, Assessment Methods for energy efficiency for Volume two, energy efficiency in the ABCB Housing Provisions, Other useful resources.

Slide 4:

Energy efficiency in NCC Volume Two,  Section H.  The two Performance Requirements in Part H6 of NCC Volume Two reflect the key concerns for energy efficiency in Volume Two of the NCC.  H6P1 Thermal performance – This relates to the building’s ability to maintain a comfortable internal temperature for occupants while using as little energy as possible to do so. By achieving good thermal performance, the building will meet objectives to improve occupant health and amenity. H6P2 Energy usage – The key objective of this requirement is to reduce energy consumption, energy peak demand, and reduce greenhouse gas emissions. 

The DTS Provisions in Part H6 also reflect these key objectives. It links to Section 13 of the ABCB Housing Provisions Standard for elemental pathway. Section 13 contains 7 Parts and is discussed in more detail later in this module.

Performance Solution: They should remember that they don’t have to use the DTS Provisions but can develop a Performance Solution instead. Or they can use a combination of a DTS Solution and a Performance Solution.

Verification Methods. Two Verification Methods exist. H6V2 Verification using a reference building. You can use this Verification Method to comply with H6P1. This method requires you to compare the performance of the proposed building with a reference building that meets the DTS Provisions. 

H6V3 Verification of building envelope sealing – This method can be used to meet the building sealing part of H6P1. It tests the air ‘leakiness’ of the building – or in other words how well the external building envelope is sealed, by using what is known as the ‘blower door test’.  In technical terms, the method requires the building envelope sealing to achieve air permeability of not more than 10 m3/hr.m2 at 50 Pa pressure when tested in accordance with AS/NZS ISO 9972 Method 1. 

Specifications. Specification 42 House energy rating software - This Specification sets out the requirements for satisfying H6P1 and H6P2 using the NatHERS DTS energy rating software pathway. 

Specification 44 Calculation of heating load limit, cooling load limit and thermal energy load limit. This Specification contains the method of calculating the hearing load limit, cooling load limit and thermal energy load limit for compliance with H6P1 and J1P2 (Volume One).

Slide 5:

What are the energy efficiency Performance Requirements in NCC Volume Two?

The key objective of the NCC Volume Two energy efficiency provisions is to reduce the greenhouse gas emissions that a building produces over its lifetime. An additional benefit of the provisions is that an energy efficient home can be more comfortable to live in and cheaper to operate. The energy efficiency provisions in NCC Volume Two address 2 aspects. The thermal performance of the building envelope – that is, the ease with which heat flows into and out of the building. It is assumed that improving the thermal performance of the building fabric will reduce the need for artificial heating and cooling. As heating and cooling are key contributors to the total energy use of a typical Australian home, improving the building’s thermal performance should reduce its energy use and therefore should reduce greenhouse gas emissions over the life of the building. (NatHERS 7 star equivalent)

The efficiency of the domestic services, that is how much energy is used to run things like air-conditioning, heating and lighting and to heat water (showers, etc.). The source of the energy used, particularly the use of renewable energy, reclaimed energy or low greenhouse gas intensity fuels.  Variations exist for NSW, Tasmania and the Northern Territory. If the trainees live and work in these States/Territory, they need to be aware of these variations. However, they should understand that the aim of the provisions is the same in all States and Territories, i.e. to reduce greenhouse gas emissions from housing in Australia.

Slide 6:

DTS pathways for compliance.

In Section H of Volume Two, some DTS Provisions contain more than one pathway for compliance. Usually, the first of these pathways will be by reference to a relevant Australian Standard (or other similar referenced document). The second will be by referencing a Part or Section of the ABCB Housing Provisions Standard – aka the Housing Provisions. 

The fire safety related DTS Provisions in Volume Two are found in Part H6 Energy efficiency. You will find they contain references to the Housing Provisions. 

The Housing Provisions contains the majority of the DTS Provisions for Volume Two, including those relevant to energy efficiency. If a DTS Provision in Volume Two does not reference the Housing Provisions, then the Housing Provisions cannot be used for that provision. 

The Housing Provisions contains DTS Provisions considered to be acceptable forms of construction that meet the requirements for complying with Parts H1 to H8 of Volume Two. That is, they comply with the Performance Requirements listed in Parts H1 to H8 of Volume Two. 

You can click on the small red Volume Two logo to bring up the connector arrow between the Volume Two and Housing Provisions boxes to illustrate the relationship between the 2 documents. 

There is no need to adopt any particular option set out in the Housing Provisions if it is preferred to meet the Performance Requirements in another way. It will then be up to the appropriate authority to decide if the Performance Requirements have been met. 

The Housing Provisions must be applied in line with each of the following. Section A Governing Requirements of Volume Two, any conditions on the Housing Provisions set out in the DTS Provisions of Volume Two where referenced, and the scope clause at the start of each Section of the Housing Provisions. 

Remember that you can also choose to develop a Performance Solution to meet some or all of the applicable Performance Requirements. In this case, it is important to discuss your proposed solution with the appropriate authority, to determine which Assessment Methods will be acceptable. It might also be useful to get advice from an experienced fire safety engineer.

Part H6, H6D2 in Volume Two outlines 2 DTS pathways for complying with the energy efficiency Performance Requirements. The pathway 1 is to use the house energy rating software (NatHERS), by applying Specification 42 to achieve the heating and cooling loads, net equivalent energy usage, and other energy saving features such as thermal breaks, compensation for a loss of ceiling insulation, floor edge insulation and building sealing. The pathway 2 is to apply the Elemental provisions, by using Section 13 of the ABCB Housing Provisions Standard (Housing Provisions) to satisfy all the detailed provisions. As you can see (when you bring up the Section 13 label and associated dot points), these provisions deal with different elements of the building, including building fabric (i.e. the external envelope), external glazing, building sealing, ceiling fans, whole-of-home-energy usage and services. 

Slide 7:

How can we comply with the energy efficiency Performance Requirements of NCC Volume Two?

All options for compliance must be supported with suitable evidence and/or documentation to demonstrate that compliance has been achieved, and assessed and approved by the Approval Authority.

If they want to, a designer or builder can choose to use a Performance Solution instead of the DTS Provisions for any aspect of the Performance Requirements. For example, they could comply with a different standard, such as the Passiv Haus standard, and present the Approval Authority with evidence that this meets or exceeds the thermal performance and building sealing provisions of the NCC. Use the reference building Verification Method to demonstrate that a Performance Solution will meet or exceed requirements. Regardless of the solution used, appropriate and sufficient evidence must be provided to the Approval Authority, to allow them to assess whether the solution meets the Performance Requirements. 

Slide 8:

Application of Part H6: NatHERS energy rating

Question 1: What minimum NatHERS energy rating is required for most houses covered by the DTS Provisions in NCC Volume Two? Answer 1: Generally 7 stars, derived using a NatHERS approved version of house energy rating software.

Question 2: When can this 7 star requirement be varied? Answer 2: Buildings in climate zones 1 and 2 – either 6.5 or 6.0 stars, depending on  whether (1)(b) or (1)(c) applies. If they have a covered outdoor area that meets the specified requirements, e.g. has a solid roof that meets the specified Total R-Value and has a permanently installed ceiling fan. If a state or territory variation exists that varies this requirement (refer to earlier slide).

Question 3: Where can you find the required heating and cooling loads for different climate zones? Answer 3: In the ABCB Standard for NatHERS Heating and Cooling Load Limits. This can be found on the ABCB website.

Slide 9:

NatHERS Energy Rating. NatHERS Assessment

One way of meeting Performance Requirement H6P1 is to do a house energy rating, which assesses the thermal performance of the building fabric, as a whole. All buildings assessed in this way must achieve a minimum 7 star rating, from a rating system that runs from 0 to 10 stars. Zero stars means that the building has little to no energy efficiency features or savings, while 10 stars means that the building should not need additional energy to heat it or to cool it to a comfortable temperature. 

There is a concession in the NCC for buildings in NCC climate zones 1 and 2, which have hot and humid weather. These concessions allow a building to rate only 6 or 6.5. stars, provided that it has a covered outdoor living area where the covering meets minimum Total R-Value requirements, AND there is a permanent ceiling fan installed.

Individual heating and cooling loads. Houses in some climate zones must also meet individual cooling and heating load limits, specific to the climate zone. This applies in “mixed” climate zones where both heating and cooling are required at different times of the year.  It doesn’t apply in climates that are dominated by hot or cold weather, for example the climate zones in much of the Northern Territory, Tasmania and some zones in Queensland and Western Australia.

Where there are specific heating and cooling loads, it means that a building must meet energy efficiency requirements for both heating and cooling, as well as meeting the overall energy efficiency target. So, a house in a mixed climate, for example in Canberra or Adelaide, might perform really, really well in winter – i.e. it has a very low heating load – while performing badly in summer – i.e. having a high cooling load. When the two loads are added together the building might remain under the total required for a 7 star overall rating, but if the building exceeds the cooling load limit, it cannot be given a 7 star NatHERS rating. 

This means that it would not comply with the building fabric efficiency requirements of H6P1. (The builder/designer would have to change the design to reduce the use of energy to cool the building before the building could achieve a 7 star rating.)

The actual heating loads, cooling loads and overall loads that a building must meet vary by climate zone. This is because it is not reasonable, for example to expect a house in a cooler climate zone, for example in Canberra, to use the same energy for heating in winter as a house in a milder climate zone, say in Brisbane. This means that a house in Canberra with a 7 star rating will use more energy for heating than a similar house in Brisbane which also receives a 7 star rating.

The ABCB Standard for NatHERS heating and cooling load limits, contains the separate heating and cooling load limits that apply to the design and construction of dwellings that are assessed using the NCC’s energy rating assessment pathway.

NatHERS assessment. Only a rating done using a NatHERS accredited software tool is acceptable. 

NatHERS assessment can be complex, as a lot of building data needs to be entered correctly into the software. It must be done by a qualified, accredited assessor using the building plans and details that will be submitted for building approval. The NatHERS Assessor provides a formal certificate of the star rating, and stamps the building plans. Once a star rating has been completed for the building and the plans have been stamped, salient details of the plans cannot be changed without doing another rating. Some designers and builders will work with a NatHERS assessor early in the design process to ensure that a new building will achieve a high energy efficiency star rating, particularly as more people are prepared to pay a premium for good energy efficiency.

The NatHERS software can be used to identify the elements of the building’s design that are contributing to poor energy efficiency and a poor star rating. For example, the software can identify that breaks in the building envelope are increasing the heating load, for example from exhaust fans or downlights. Or it might identify that large unshaded windows on the west of the building are increasing the cooling load.

“Tweak” a building’s design and construction features to improve the energy efficiency and therefore the star rating. If this is done early in the design process, then big improvements can be made to energy efficiency relatively easily and cheaply. 

For example, there is a misconception that double glazing is always the solution for achieving good thermal performance, particularly in mixed climates, and double glazing can be expensive. But, in fact, altering the size of windows on different orientations and changing the shading on windows can go a long way towards improving a building’s energy efficiency and therefore its star rating. For example, increasing the width of the eaves on the east and west of a building to provide shade over glazing can help to reduce solar gain in summer.

An experienced NatHERS assessor can identify the key elements contributing to a poor star rating and suggest less expensive improvements that can help to increase the rating.

Other requirements: A NatHERS rating is not sufficient on its own to comply with H6P1 and H6P2. 

To meet these Performance Requirements, the building also has to comply with the other common parts of the DTS Provisions such as Part 13.5 of the Housing Provisions for building sealing (H6P1) and Part 13.7 of the Housing Provisions for services (H6P2). Later slides contain activities to work through some of the details of these other DTS Provisions for complying with H6P2. 

Points of potential confusion. When the NCC references a climate zone, it is referring to one of the eight climate zones described in Schedule 1 Definitions in the NCC.

The climate zones used in the NatHERS software are not the same as the NCC climate zones. NatHERS software uses a more detailed set of climate zones (69 as at early 2021) that recognise a wide set of climate differences including wind patterns. This doesn’t change the assessment of which NCC climate zone a building falls into.

Energy efficiency star ratings similar to NatHERS ratings are used for other purposes in some States/Territories. For example, the ACT requires buildings being bought and sold to advertise an energy efficiency rating, known as an EER. If the building is brand new and has never been occupied, a NatHERS rating can be used as the EER (this is usually the NatHERS rating that the building received in order to gain building approval). If the building has been occupied, however, the EER is not quite the same as a NatHERS rating. It is done using different software and rates houses on a scale of 1-6 stars only. 

An existing house that receives a 6 star EER rating would not necessarily achieve a 7 star NatHERS star rating. If a trainee is working in the ACT or nearby, they need to understand the difference between these two rating schemes. An EER is simpler and cheaper than a NatHERS assessment, but you can’t use an EER star rating to apply for building approval for a new building or renovations.

NSW uses a similar rating systems called BASIX. This tool provides NSW homes with the same level of performance as NatHERS 7 star.

Slide 10:

What are the DTS Provisions in Section 13 Energy efficiency of the Housing Provisions?

Part 13.2 Building fabric. The intent of the building fabric provisions is to ensure that the building envelope is an effective means of resisting unwanted heat flow. 

Heat always flows from a warmer space to a cooler space, so heat flow may be either predominantly into or out of a building depending on the climate zone. Insulation can assist in limiting heat flow. A thermally efficient building envelope means less energy is needed to artificially heat or cool internal spaces.

Thermal insulation can be reflective or bulk insulation. It can be added to the elements of the building fabric to achieve the required Total R-Value specified in the Housing Provisions.

Walls. Requirements for Total R-Value of external walls are tailored for different climate zones and the requirements are different for both high-mass and light weight external walls – e.g. cavity masonry or metal sheet on timber stud construction.

Floors. Insulation requirements for floors also vary for floor types e.g., suspended floors, on-ground slabs.

Bathrooms. There is a concession for built-in heating or cooling that is solely used in a bathroom or amenity area.

Roof lights. There are also DTS Provisions for roof lights, which are defined in the NCC as  “… a skylight or window installed in a roofto permit natural light to enter the room below and which is at an angle between 0 and 70 degrees measured from the horizontal plane.”

From a thermal design perspective, a roof light must be protected to reduce the heat loss or gain.

Part 13.3 External glazing. The intent of Part 13.3 is to control the amount of heat entering or leaving a building through glazing. The means by which the heat enters or leaves a room through glazing are conduction, solar radiation and air infiltration.  Conduction and solar radiation are addressed in clauses 13.3.2 and 13.3.3, while infiltration is covered under the sealing requirements in Part 13.4.

There are 5 key factors affecting heat transfer, which are location of the building, area of glazing, degree of sun exposure – orientation and shading.

If the building is air-conditioned the type of frame and glass used as this determines the Total System U-Value and Solar Heat Gain Coefficient for the glazing system.

The treatment of glazing to limit unwanted heat gain or loss is one of the most important aspects of the energy efficiency requirements in the Housing Provisions. Glazing design is assessed based on conductance and solar heat gain. The Housing Provisions set separate maximum allowances for conductance and for solar heat gain. 

Formulas relating to solar conductance and solar heat gain are then used to calculate the performance of the proposed glazing layout for comparison with those allowances. The ABCB Glazing Calculator can assist with calculations. Note this is a non-mandatory tool and is neither a compliance tool, nor a Verification Method.

Part 13.4 Building sealing. The Part 13.4 Building sealing DTS Provisions address chimneys and flues, roof lights, external windows and doors, exhaust fans, construction of ceilings, walls and floors, evaporative coolers.

These provisions are designed to restrict the unintended leakage of outdoor air into the building and loss of conditioned air from a building.

Overall, the DTS Provisions encourage ventilation that can be controlled by occupants to make use of warmer or cooler outside air when that is desirable and also to maintain a healthy indoor environment. 

Building sealing supports that goal by reducing the pathways for unintended leaking of air that has been heated or cooled for the comfort of occupants. This in turn, has the capacity to reduce the energy required for artificial heating, cooling and dehumidifying. 

Part 13.5 Ceiling fans. The intention of Part 13.5 is to provide requirements for the installation of ceiling fans for cooling in climates where it is suitable.

This part applies in climate zones 1, 2 and 3, and climate zone 5 in New South Wales and Queensland

Part 13.6 Whole-of-home energy usage. The intention of Part 13.6 is to provide a collective budget for energy use in a building. The whole-of-home energy budget covers a number of factors. Floor area of the home, main heating/cooling equipment, main water heater, swimming pool, spa, and on-site PV.

The whole-of-home budget can enable trading between the efficiencies of the above types of energy usage within the building, including by increase the size of on-site renewables, such as solar.

The ABCB has produced a Whole-of-home calculator that automates the calculations and it is available from the ABCB website.

Part 13.7 Services. The intention of the Part 13.7 services provisions is to minimise energy lost through the operation of air-conditioning, central heating, lighting, heated water supply, pool and spa heating and pumping.

The requirements range from the insulation of services, limiting the use of electric resistance space heating, limiting the Watts per square metre allowed for lighting, placing restrictions on certain energy sources for both heated water heating and swimming pool and spa heating.

Artificial lighting must not exceed specified power allowances (5 Watts per square metre for a Class 1 building) in 13.7.6 Artificial lighting. Power allowance can be increased if there are ‘smart’ lighting controls e.g. movement sensor activated lighting.

The lamp power density or illumination power density allowances are as follows. 5 watts per square metre in a Class 1 building, 4 watts per square metre on a verandah, balcony or the like attached to a Class 1 building, 3 watts per square metre in a Class 10a building associated with a Class 1 building, Halogens must be separately switched from fluorescents, outside lighting must be controlled by a motion sensor or be of high efficacy. “High efficacy” requires high light output for each unit of electricity consumed. 

Requirements for heated water supply systems, including their energy efficiency are located in NCC Volume Three Part B2.  These requirements cover the energy source of the system and they must be either solar, heat pump, gas, only in certain circumstances electric resistance or wood fired.

These provisions have been drafted to favour solar, heat pump and gas hot water supply systems over electric resistance water heaters, based on their lower greenhouse gas emissions.

Slide 11:
Interpreting the Housing Provisions

Question 1: Consider a ceiling area in a kitchen-family room of a single story home that would usually require a minimum R-Value of 3.0 to meet the requirements of the NCC. If 2.4% of that ceiling area is uninsulated because of recessed downlights, how much does the R-Value of the ceiling insulation need to increase in order to compensate for this loss?

Table 13.2.3w Adjusted minimum R-Value of insulation required to compensate for loss of ceiling insulation area. Minimum R-Value required to compensate for loss is 4.2, which is an increase of 1.2. The DTS Provisions in clause 13.2.3 contain minimum insulation requirements for roofs, ceilings, floors and external walls, and the installation of roof lights. The DTS Provisions also include requirements to compensate for gaps in insulation due to service penetrations, e.g. downlights and exhaust fans, as per this question.

Question 2: According to clause 13.3.4 Shading, how are the distances P, G and H calculated, when designing shading for glazing using the Housing Provisions? 

Figure 13.3.2b Method of measuring P and H. P is the distance between the line of the glazing and the furthest vertical edge of the shading projection or device. G is the distance between the top of the glazing and the lower horizontal edge of the shading project or device. H is the distance between the bottom of the glazing and the lower horizontal edge of the shading project or device.

Question 3: What DTS requirements apply to the sealing of external doors and windows?

13.4.4 External windows and doors. 1. An external door, internal door between a Class 1 building and an unconditioned Class 10a building, openable window or similar must be sealed when serving a) a conditioned space or b) a habitable room in climate zones 4, 5, 6, 7 and 8.

2. A seal to restrict air infiltration, a) for the bottom edge of a door, must be a draft protection device, and       b) for the other edges of a door or the edges of an openable window or other such opening, may be a foam or rubber compressible strip, fibrous seal or the like. 

3. A window complying with the maximum air infiltration rates specified in AS 2047 need not comply with (2)(b).

Question 4: For a house located in climate zone 3, what is the minimum number of fans, including their diameter, required for a bedroom 16m2 in size? 

Table 13.5.2 Minimum ceiling fan requirements in climate zones 1, 2, 3 and 5. The bedroom requires one ceiling fan, with a diameter of at least 1,200 mm.

Question 5: What would the swimming pool pump factor be for a 4.5 GEMS star pool pump in Western Australia?

Table 13.6.2c Swimming pool pump factor FP (kW/1000 litres.annum). For a 4.5 star pump in Western Australia the swimming pool pump factor (FP) is 0.027.

Question 6: What referenced documents are referred to in Part 13.7 Services?

For thermal insulation of central heating water piping and heating and cooling ductwork, AS/NZS 4859.1 Thermal insulation materials for buildings – General criteria and technical provisions. For sealing heating and cooling ductwork, AS 4254.1 Ductwork for air-handling systems in buildings – Flexible duct, AS 4254.2 Ductwork for air-handling systems in buildings – Rigid duct, Also references Part B2 of NCC Volume Three for design and installation of a heated water supply system, including the water heater.

Slide 12:

Energy efficiency Assessment Methods

Whether you choose to use a DTS Solution or a Performance Solution or a combination of them, you may need to provide some evidence that the proposed solution complies with the Performance Requirements.

The NCC recognises 4 valid ways of assessing possible compliance solutions, which are shown on the slide. All methods can be used to demonstrate compliance with the Performance Requirements when you are using a Performance Solution. Evidence of suitability and Expert Judgement can be used when you are using a DTS Solution. Alternative, non-NCC, Verification Method such as LEEDS, ASHRAE or the Passiv Haus standard, may be able to be used if they are accepted by the appropriate authority.

Slide 13:

Which of the following is a conditioned space for the purposes of NCC Volume Two?

Home office above garage with split system air-conditioning

Conditioned space. A home office is a habitable room. Since it may be used for significant periods of the day, it would normally need some form of air-conditioning. Bathroom with under-floor heating system

Non-conditioned space, as a bathroom is a not a habitable room according to the NCC definition. Most under-floor bathroom heating systems have very low wattage, and the space in a bathroom tends to be small so the heating load should not be large. This means it should be below the heater capacity of 1.2 kW in the conditioned space defined term. 

Sunroom created by enclosing a porch with glazing. Non-conditioned space, if it has no mechanical heating or only a small heater. Conditioned space, if a heater of sufficient power has also been installed in the space.

Slide 14:

True or False?

To meet the NCC Energy efficiency Performance Requirements, all newly built Class 1 buildings in Australia must use the same amount of energy for heating, cooling and other energy requirements?
If you chose False, yes that’s right. All newly built Class 1 buildings must achieve a similar standard of energy efficiency. But the allowed energy use differs in different climate zones and because of other factors

Besides the climate zone the house is in, other factors that can affect the actual heating, cooling and operational energy loads for different buildings include the size of the building – a bigger building naturally uses more energy than a smaller one and a house with more people living in it will also tend to have greater demands for energy. Therefore, you would not expect a 1 bedroom unit to use the same amount of energy as a 4-bedroom family home. On-site energy generation – if a building generates some of its own power, this can offset the heating and cooling loads and improve its overall energy efficiency.

Slide 15:

What elements do the energy efficiency provisions in the Housing Provisions cover?

Answers. 1.Domestic services, H6P2 Energy usage, ABCB Housing Provisions Standard 13.7 Services
2.Air movement, H6P1 Thermal performance, ABCB Housing Provisions Standard 13.5 Air movement
3.External glazing, H6P1 Thermal performance, ABCB Housing Provisions Standard 13.3 External glazing
4.Building sealing, H6P1 Thermal performance, ABCB Housing Provisions Standard 13.4 Building sealing
5.Building fabric, H6P1 Thermal performance, ABCB Housing Provisions Standard13.2 Building fabric
6.Domestic services, H6P2 Energy Usage, ABCB Housing Provisions Standard 13.6 Whole-of-home energy usage

Slide 16:

True or False?  Every new Class 1 building in Australia must have a NatHERS energy rating to demonstrate that it meets the NCC energy efficiency Performance Requirements.

If you chose False, yes that’s right. A designer or builder can demonstrate compliance against each of the elemental DTS Provisions instead of doing a NatHERS energy rating. In NSW, BASIX ratings are used instead of NatHERS energy ratings. A different compliance option, such as a reference building or a different rating system, could be used as part of a Performance Solution

Slide 17:

Other useful resources. These resources are not mandatory. They provide guidance and help, but nothing in them needs to be complied with in order to comply with the NCC.

Nor do the calculators act as Verification Methods. This means that you can’t present evidence from the lighting calculator, for example, to demonstrate compliance with the lighting requirements in H6P2 Energy usage.

Slide 18:

Summary. Performance Requirements, Part H6 Energy efficiency in NCC Volume Two, H6P1 Thermal Performance, HP62 energy usage

DTS Provisions. Part H6 Energy efficiency in NCC Volume Two, H6D1 DTS Provisions, H6D2 Application Part H6, Section 13 Energy efficiency in the housing provisions (i.e elemental DTS Provisions)

Common DTS Solution. House energy efficiency rating plus some elemental DTS Provisions, OR all elemental DTS Provisions.

Slide 19:
Key Points. Overall aim is to reduce greenhouse gas emissions from domestic buildings in Australia. Compliance with requirements reduces energy used to maintain a comfortable temperature and operate the building. Heating and cooling loads are key and evidence of compliance is commonly provided through energy rating - either NatHERS or BASIX in NSW. Other elements must be met using DTS Provisions or a compliant performance Solution.

Slide 20:

Thank you for your time. That brings our presentation on Using the energy efficiency provisions in NCC Volume Two to a close. If you’d like more information please visit