 Hello and welcome to this presentation on our NCC 2022 Housing Energy Efficiency provisions. I'm Mark Davis, your host. Before we begin, I'd like to acknowledge the traditional custodians of the land on which we are each participating in this presentation. In my case, this is the Ngunnawal and Nambri people of the Canberra region. I would like to pay my respects to elders and extend this to all Aboriginal and Torres Strait Islander peoples here today. Today's presenter is Audrey Chen. Audrey is one of the Energy Efficiency Team members here at the Australian Building Codes Board. Her work involves project managing some of the energy efficiency changes included in the code. Before we hand over to Audrey, I'd like to cover off the learning outcomes for this presentation. After this session, the aim is that you'll have a better understanding of the NCC and learn the following. First, be able to describe the changes to the National Construction Code 2022 as they relate to housing energy efficiency. Then interpret and understand some of these provisions. And lastly, identify when these provisions will be adopted. Now I'll hand you over to Audrey, who will take you through the content. To get us started, let's look at what we'll cover for houses. Today's presentation will take us through the following. Firstly, the intent of the new energy efficiency requirements and updates. Secondly, an overview of key changes to clause numbering. Next, we'll go through the mandatory performance requirements for houses, changes to the compliance options. And lastly, adoption of NCC 2022 and where you can access for the guidance. Okay, so what is the intent of the new requirements? Let's move on to the next slide. There are three objectives, which are two, reduce energy consumption and energy peak demand, reduce greenhouse gas emission, improve occupant health and amenity, and they also help deliver on the commitment by all Australian governments to reduce greenhouse gas emission, including the Australian government's enhanced 43% emission reduction target for 2030 and commitment to net zero by 2050, which was announced in October 2021. Okay, let's start with the key changes to clause numbering. The one of key changes is the updates to the clause numbering that occurred throughout the entire NCC. It is referenced to as SPTC, which reflects the new system reference syntax section, part, type, clause. Some examples are shown on the screen. Importantly, SPTC returns as much of the previous NCC's reference system as possible. To assist practitioners transition to the new referencing system, NCC 2022 includes NCC 2019 numbering alongside the new numbering. In addition to this, it is also shown on the screen in the table that DTS, Elemental Provisions in section 3 of NCC 2019. I will now get into specifics of the changes starting with the mandatory performance requirements for houses. There are two mandatory requirements that determine the compliance level of energy efficiency for houses. H6P1, covering some more performance, and H6P2 for energy usage. The main changes to these two performance requirements compared with NCC 2019 are the quantification of the performance requirements. In NCC 2019, the performance requirements are qualitative and subjective in nature. The 2022 quantification changes provide more clarity in how the performance requirements should be interpreted by providing measurable indicators to determine compliance. At this stage, for H6P2, only H6P21 has been quantified. Within these new requirements are some additional subclasses to reflect the increased strangency and the new whole-of-home provisions. I will talk more detailed changes to the performance requirements in the next slide. For some more performance, the updated performance requirement at H6P1 models the strangency level at 7 stars equivalent and simplify the requirement into three parts. Total heating load, total cooling load, and total thermal energy load. The thermal energy load is the sum of the heating and cooling loads. The total heating load, cooling load, and thermal energy load can't be more than the load limits calculated in accordance with specification 44. Compliance with H6P1 can be met without completing the calculations in specification 44 if other compliance options are used. For energy usage, there are two clauses under H6P2. The first clause H6P21 show on this slide is a newly introduced requirement for whole-of-home energy usage. The energy value of a Class 1 building's domestic services can't exceed 70% of the value calculated with benchmark equipment. That is a 3-star duct heat pump for heating and cooling, 5-star instantaneous gas-water heater, and lighting power density of 4 watts per square meter. Please note both energy values and domestic services are defined terms under NCC. The second clause H6P22 is the same as an existing clause P2.6.2A in NCC 2019. One question you probably have is that how does H6P22 related to H6P21? H6P22 focuses on an individual component of system of domestic services. Whereas H6P21 sets the minimum overall performance level of regulated key fixed appliances as shown on the previous slide. Both H6P21 and 2 need to be satisfied. I have just covered the mandatory performance requirements. Now I will cover the compliance options to meet these requirements. The compliance level for thermal performance and energy usage is the two performance requirements we just talked about, H6P21 and H6P22. For compliance options we have the deemed to satisfy DTS options in the blue boxes on the left side, option 1, energy reading, and option 2, elemental provisions. We also have performance solution options in the purple boxes on the right side including verification methods. I will cover the DTS options, verification methods, and performance solutions in the rest of the slides. The most commonly used compliance option is DTS. As shown in the figure on the last slide, for a housing energy efficiency there are two compliance pathways and the DTS. Use of house energy rating software, which means the nationwide house energy rating scheme, NATOS, and DTS elemental provisions. There is a separate session on NATOS software. For the NATOS compliance option, I won't cover the changes to NATOS software tools. But I would like to highlight a few points for the NATOS compliance pathway in NCC 2022 for houses. Firstly, we have consolidated all relevant clauses for the NATOS compliance option into specification 42. The star ratings required in specification 42 clause S42C2 for heating and cooling loads have been changed to reflect the stringency increase for NCC 2022. The split heating and cooling load limits have been updated, which is included in the next slide, slide 20. S42C3 NAT equivalent energy usage is required if you will use house energy rating software, i.e. NATOS software, to meet the newly introduced whole-of-home requirements. I will discuss these shortly in the compliance options for the second performance requirement energy usage. Under S42C4, there are other DTS elemental provisions that need to be met besides NATOS star rating and heating cooling load limits. This includes requirements for how thermal insulation is installed and the need for a thermal break in some instances. The new heating and cooling load limits can be accessed from the ABCB website. Another point to highlight for the NATOS option is that there is a new clause A5G9 that requires a NATOS certificate as evidence if using the NATOS compliance option. Now I will focus on the DTS elemental provisions for thermal performance, linking back to the point earlier about NCC restructure. NATOS compliance option is included in specification 42 in volume 2. However, DTS elemental requirements are in part 13 of the ABCB housing provision standard. Part 13 of the housing provisions includes part 13.2, building fabric to part 13.5, ceiling fence, that are required for thermal performance. Part 13.4, building ceiling is the only part totally unchanged from NCC 2019 except numbering differences. Within these provisions, there are new insulation requirements and some increase the stringency to achieve 7 star performance. Let's start from 13.2, building fabric. For building fabric, the new elemental provisions identify a broad range of building elements, properties and values which are deemed to produce acceptable performance. This is done through lookup tables like the one on the screen here. On this slide, I've included an example for our page to roof with horizontal ceiling in NCC climate zone 7. The apply value R value is based on the following factors. First factor is roof ventilation, vented or standard. The table notes explain what is considered as vented, otherwise it is considered as standard roof. Then you work out whether there is a reflective insulation under the roof, yes or no. And then if yes, the under roof insulation are valued. For example, vented roof with reflective insulation and under roof insulation are valued less than 1. The last step is to determine the solar absorptance value by finding the cross bounding column and you will get the minimum R value required. So if the solar absorptance value is between 0.32 and 0.42, the minimum R value for roof is 4.5. Clauses 13.2.5 external walls and 13.2.6 floors and subfloor walls of the ABCB housing provisions follow the same logic and format as the roof and ceiling. There are series of lock up tables for different NCC climate zones which are the result of thousands of modeling runs to achieve 7 star thermal performances. Besides solar absorptance value as one of the key factors for wall tables, the size of overhanging and wall height are also key inputs to determine the minimum required level of R value for walls. For floor insulation, subfloor walls are part of the consideration in some cases. When we talk about minimum R values for roof, wall and floor in the previous slides, if a dwelling uses metal frame for NCC 2022, there are additional thermal bridging mitigation measures that need to be met. New thermal bridging requirements align performance of steel frames to the same level as timber frames. To meet thermal bridging mitigation requirements for roofs, walls and floors, there are two ways. Firstly, to achieve total R values given and secondly, follow specific mitigation measures outlined in the NCC. Before we move to the next part on glazing, I just would like to mention that roof light provisions have been changed in NCC 2022 to align with roof light provisions in NCC Volume 1. Now onto glazing. To be better aligned with 7 star netters, there are a set of new glazing factors. Level factor, bedroom factor, frame factor, floor factor and the winter open ability. Winter and summer exposure factors are also updated to be better in line with 7 star netters. Please note a beta version of the new NCC 2022 glazing calculator and tips in the new NCC 2022 handbook is available on our website. Ceiling fans facilitate significant reduction in the use of artificial cooling. The ceiling fan requirements have replaced the NCC 2019 requirements for air movement. In climate zones 1, 2 and 3, these requirements include both daytime and nighttime occupied spaces. In climate zone 5, which is Queensland and New South Wales, ceiling fans are only required in daytime occupied spaces. Ceiling fans are not required in circulation spaces like highways and entrance voyeurs. As shown in this slide, in climate zone 1, 2 and 3, a bedroom with an area less than 15 square metres requires an 100 millimetres ceiling fan. Next, I'm going to talk through the relevant verification methods. This may be used as a part of developing a performance solution to demonstrate compliance with performance requirements for the housing energy efficiency verification methods. Both the reference building verification method and the building envelope ceiling verification method have been changed. The verification method using a reference building or VURB has been changed to reflect the stringency increase. Operating schedules for heating and cooling, thermal status settings and maximum occupancy are included to provide more clarity for modelling. The class 1 verification using reference building verification method only covers the thermal performance requirements, not whole of home. This is different to class 2 apartments. Under the update, building envelope ceiling verification method, if a house is sealed too tight, that is, less than 5 cubic metres per hour square metre at 50 par, there are additional requirements that need to be met. Although the new updates are in the energy efficiency part, the changes to H6V3, building envelope ceiling verification method, were included to mitigate condensation risks. NCC verification methods are an agreed assessment method to demonstrate compliance with the performance requirements. However, other performance solutions may be developed. We touched on earlier in the presentation where I outlined you could use specification 44 to directly meet thermal performance requirement H6P1 as an option for a performance solution. That wraps up on the compliance options for thermal performance. Next, I will go through compliance options for the second performance requirement energy usage H6P2. To meet the new whole of home requirements, there are two options under DTS. Using NCC or for a house with a floor area not greater than 500 square metres, using part 13.6, whole of home energy usage in the housing provisions to calculate the net equivalent energy usage. For NCC, it is required to achieve a score of not less than 60 as shown on this slide. I am going to talk you through using part 13.6, whole of home energy usage to calculate the net equivalent energy usage for compliance with H6P2. There are three steps to meet the whole of home requirement outlined in part 13.6. Step one, calculate the net equivalent energy usage in accordance with the formula in A. Capitalized A is the floor area factor. E is the efficiency factor covering space conditioning and water heaters. To get the efficiency factors for main space conditioning and main water heater, you need to check the ABCB standard for whole of home efficiency factors. This standard can be accessed through ABCB's website, which is shown on the next slide. EP and ES are the energy usage calculated for swimming pool and spa pumps. ER is the installed capacity of outside photovoltaics PV. Step two, calculate energy usage allowance in accordance with B. EF is the energy factor which can be obtained from table 13.6 to B. Step three, compare the results from step one and two. If step one result is less than step two, you meet the whole of home requirement. You also can use whole of home calculator available on our website instead of manually looking up the whole of home efficiency factors and calculating net equivalent energy usage. Before I give an example for the whole of home calculator, I would like to show you the whole of home efficiency factor standard. It can be accessed from the ABCB website. Here is an example using the whole of home calculator. The heating and cooling uses a heat pump and the water heater uses an off-peak heat pump. This together with a 7 kilowatt PV to offset has kept the net equivalent energy usage below the allowance 5.8 kilowatt of PV capacity. Please note that installed PV or ER is not mandatory. You could meet the whole of home requirement without PV if the net equivalent energy usage calculated in accordance with A. It's not greater than the energy usage allowance B as shown in the previous slide. As mentioned previously, H6P22 is an existing provision from NCC 2019. Hence, part 13.7 services in the housing provisions must be met for DTS compliance options for both NATO's compliance option and the compliance with the DTS elemental provisions. Part 13.7 services is the same as part 3.12.5 in NCC 2019 Volume 2 except a minimum R value introduced in NCC 2022 for a swimming pool cover. This change was made based on public comment draft feedback to align with Volume 1. Last but not least, if you want to know more about what I have covered in this presentation, there are a few places you can visit. The ABCB Resource Library has lots of content to help you understand the NCC. You can find the resource library on ABCB website. Our resources include in-depth handbooks, helpful articles and calculators to provide for the guidance when working with the NCC such as the new Housing Energy Efficiency Handbook. Alternatively, our YouTube channel has many helpful videos to watch at your own pace. Thank you for that Audrey. That brings our presentation on the changes to housing energy efficiency in the NCC 2022 to a close. If you want more information visit abcb.gov.au. Thank you for watching.