Homestar Technical Clarification Rulings
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| Technical Question Title | Tool Version | Date Released | Credit Name | Tool Category |
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| 62 - V4 | V4 | MAN | ||
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Approved Ruling: A shared driveway serving multiple dwellings could be treated as a street for the purposes of MAN-1(Street Surveillance), on a case by case basis. The project team that would like to use this compliance method must submit a TQ and supply photos showing that at least one window/glass door of each dwelling is visible from other dwellings. |
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| 26 - V4 | V4 | MAT | ||
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Approved Ruling: The intention of the MAT-1 credit is to ensure that building materials are sourced and produced responsibly with a low impact on the environment over their lifetime. The intention of MAT-2 is to minimise use of VOCs. The use of eco labels as a reference is a way of ensuring that this is the case with materials used on a project. Therefore, where a manufacturer of products that have an eco-label produces another model in the same range without official certification but using the same materials and under the same conditions as the product with an eco-label, it is likely to have as low an environmental or health impact. Therefore, if the manufacturer can confirm that a product is made with the same materials and under the same conditions as another product in the same range with an eco-label, this product will be awarded the same points. |
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| 103 - V4 | V4 | MAT | ||
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Approved Ruling: The COLORSTEEL® EPDs for long-run steel roofing are considered product specific because they cover the specific processes relating to a specific product. |
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| TQ153 Reduced capacity bins with increased collection frequency | V5 | LV3 - Eco-Friendly Transport | ||
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Approved Ruling: From the outlook of sustainability, and to discourage possible excessive pick up frequency whilst encouraging resilient communities. The bins need to be appropriate sized per the Homestar guidelines. So, having a smaller sized waste facility would not comply even though pick up is increased |
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| TQ171 Calculation Methods for R value | V4.1 | EHC | ||
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Approved Ruling: The NZGBC advises that the R-value for various assemblies can be calculated using a variety of methods and information sources, depending on the Homestar version of the assessment. See the accompanying table for a summary of approved methods and sources. Projects registered after the issue of this TC would need to comply |
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| 79 - V4 | V4 | STE | ||
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Approved Ruling: The TQ to use a swale set up in the council owned unused public land adjacent to the project site to achieve compliance with STE-1 is granted. This is because; (1) this achieves the credit intent of local stormwater management without entering and burdening the council reticulated network, even if this is not done on within the boundaries of the project property itself (2) the land is currently unutilised, and the project owner is taking on the cost of developing the swale through agreement with the local authority (3) developing the swale would not reduce the ecological value of the land (and may in fact improve it) (4) the swale combined with the tank system within the project site meet the performance requirement for the points being targeted. |
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| TQ188 - V5 Hydraloop for toilet water | V5 | EF3 - Water Use | ||
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Approved Ruling: The NZGBC advises that Hydraloop water recycling system should not be entered in the rainwater portion of the Water calculator as it is not a rainwater system. However, we acknowledge that the Hydraloop system can offset water demand by recycling grey water. Therefore, the percentage offset should be calculated based on the total water demand (as below) and the calculation provided to the NZGBC during submission to award points. Also, the project can apply for innovation point for using the system. |
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| 83 - V4 | V4 | EHC | ||
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Approved Ruling: When calculating the % coverage of carpets or acoustic ceiling tiles with respect to habitable space area, the Homestar Assessor may exclude the kitchen wet areas of open plan kitchen/living spaces. This is because (a) these wet areas should not have carpet, and (b) separate kitchens are already excluded from habitable space therefore it would be inappropriate to penalise dwellings with open plan kitchen living areas. |
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| TQ155 fRsi internal non-conditioned areas in apartments | V5 | HC4 - Moisture Control | ||
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Approved Ruling: NZGBC exempts the internal wall between an apartment and communal corridor(s) from the credit HC4 fRSI requirements provided the external envelope of the corridor is ‘fully insulated’. This is typical of Passive House practice in the warmer climates of New Zealand as the corridor is now inside the thermal envelope (but not inside the Conditioned Floor Area). An envelope would be considered ‘fully insulated’ provided it meets the minimum, of the schedule R-values in the 2008 H1. This applies to homes up to 8 Star for climate zones 1-5, but with 9 and 10 Star homes proper fRsi analysis would be required to establish if the junctions need to be thermally broken. In climate zone 6 it applies to only 6 and 7 Star homes. |
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| 87 - V4 | V4 | EHC | ||
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Approved Ruling: The reference dwelling glazing area used in the heat loss calculation method for terraces and apartments would be 30% of the internal conditioned floor area of the actual dwelling. The wall area would be the total external façade area of the actual dwelling minus this glazing area. Where the glazing area is higher than the actual façade area, the glazing area will be the façade area (100% glazing) For standalone dwellings this reference dwelling glazing area would remain 30% of total façade area as per NZS4218 and guidance to date. |
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| TQ168 Use of sliding door- Net openable area | V4.1 | EHC | ||
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Approved Ruling: NZGBC clarifies the explicit exclusion of glass sliding doors in the 5% of openable window area in both EHC-1 and EHC-3 due to security, sound and weather concerns. Any window that makes up the 5% openable window area is required to be securable when open. Please note: Projects registered after the publish date of this TC are required to comply. Additional Comments: While it may be possible to secure a glass sliding door while slightly open, , NZGBC contends this is not a good design solution for either cooling or ventilation due to security, noise and safety concerns. |
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| 94 - V4 | V4 | WAT | ||
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Approved Ruling: This TQ is APPROVED as the assessor personally witnessed these restrictors installed and the intention of the credit is met across the development. |
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| TQ158 Bio-ethanol fire | V4.1 | EHC | ||
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Approved Ruling: NZGBC advises the selection of LPG gas flued for the EHC 2 calculation. This has the closest emission factor tothe chosen fuel ethanol with68kg CO2per MJ/m2. |
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| 53 - V4 | V4 | EHC | ||
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Approved Ruling: Commercial and retail spaces adjacent to dwellings (in apartment blocks) can be considered as conditioned space if they are conditioned 24/7 as an adjacent home can be expected to be. If they are only conditioned during office hours (when residents are less likely to not be at home), these spaces should not be considered conditioned (treating intertenancy walls/floor as external walls or floors). However, if all external walls/floors etc. of the adjacent commercial/retail space is insulated to Homestar levels, you may also consider this space conditioned, even if not air conditioning is provided. |
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| TQ152 PVsyst Photovoltaic Software | V4.1 | EHC | ||
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Approved Ruling: NZGBC can allow the use of PVsyst instead of BRANZ Calculator to determine kWh/annum produced. However, to calculate the emissions offset please input this figure into the Energy Calculator Tab. Also, provide details of analysis to NZGBC after incorporating this calculation into the project. Additionally, to validate the chosen software is more accurate than the BRANZ calculator. It is advisable to show comparative result between BRANZ Calculator and PVsyst. |
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| TQ140 Air and vapour control strategy | V4.1 | EHC | ||
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Approved Ruling: “This TQ is accepted on the basis that the design team have confirmed that they have carried out due diligence on the risk of interstitial moisture. Under no circumstances must this TQ be construed as an NZGBC review or endorsement of the proposed design. Points are being awarded on the basis that the project’s design team have carried out their own review”. |
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| 3 - V4 | V4 | EHC | ||
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Approved Ruling: You may cross reference of Perceived Sound Reduction (PSR) table with Sound Transmission Class (STC) values for the purposes of EHC-9. |
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| 73 - V4 | V4 | STE | ||
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Approved Ruling: The TQ to achieve STE-2 points by planting on an adjacent unused site to the project is accepted, provided there is an agreement in place with the owner of the un-used land to maintain this as a planted area. This meets the credit intent by improving the native ecological value of sufficient amount of land area at the project owner's expense. |
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| 78 - V4 | V4 | EHC | ||
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Approved Ruling: The TQ to have Passive House Plus certification accepted for full points for the renewable energy component in EHC-8 is awarded. Passive House Plus certification requires renewable energy generation to exceed the dwelling’s renewable primary energy demand. Passive House Certification is already accepted to verify points in EHC-1 and EHC-2 corresponding to performance benchmarks required for that certification. This TQ is awarded based on that precedence. |
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| TQ162 Climate Zones for Homestar Ready v5 | V5 | HC1 - Winter Comfort, HC2 - Summer Comfort, EN4 - Construction Waste Minimisation | ||
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Approved Ruling: For Volume assessments of homes achieving no higher than 7 Stars,it is acceptable to split the volume assessed homes into typologies that are representative of each of the 6 climate zones in the H1 Fifth edition. Energy modelling/ECCHO modelling should be carried out using either the ECCHO climate file representative of the climate zone in the table below or the corresponding NIWA EPW file at the altitude of the weather station in ECCHO or EPW file. As follows : Climate Zone- Representative Climate Data 1-Auckland 2-Napier 3-Wellington 4-Turangi 5-Christchurch 6-Queenstown The overheating risk matrix should be submitted with the volume assessment. This should make conservative assumptions about the neighbourhood, such as that the homes are being built in the ‘City’ (factor 2), have two barriers to opening windows (factor 3) and have no shading from surrounding buildings or foliage (factor 8). Factor 7 (bedroom window orientation) should take the worst case for submitted orientations. Less conservative assumptions may be made, however, they must be recorded on the volume assessment and be limiting factors on the applicability of the volume assessments, i.e. volume assessed homes that have been risk assessed for Rural and Urban environments may not be used for the City environments. Modellers may decide the prevailing wind direction for the purposes of overheating at their discretion. Also, default assumptions may be made for shading from surrounding buildings and foliage. In ECCHO this would be 80% for winter sun admitted and 90% for summer sun admitted. Account must be taken of self-shading from the building itself, i.e. from a wing of the home in an L-shaped house. |
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| TQ174 Whole project waste diversion | V4.1 | WST | ||
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Approved Ruling: The NZGBC allows for running waste diversion to be used as evidence for each project stage at the time of completion/submission. Considering waste is monitored throughout the project, which is critical for effective waste management and this credit. However, in accordance with the TM requirement, a detailed Waste report should be provided to support the points claimed. Please ask us for a detailed Waste report template/sample if required. |
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| TQ160 Door undercut exemption with commissioning | V4.1 | EHC | ||
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Approved Ruling: NZGBC accept the removal of undercuts/transfer grill provided commissioning is carried out per the TM 4 guidance (pg 52) and a report submitted to include at minimum; Description of the property, location/address of the building, name and address of the tester, time of adjustment, ventilation system manufacturer and type of device, adjusted volume flow rates for standard operation, mass flow/volumetric flow balance for outdoor air and exhaust air (maximum imbalance of 10 %), results of airflow in litres per second at each room terminal. A report should be provided regarding the adjustment of all supply air and extract air valves. |
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| 102 - V4 | V4 | DRE | ||
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Approved Ruling: This is acceptable provided the office meets the daylighting requirements for bedrooms. |
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| TQ172 STC criteria for EHC-9 | V4.1 | EHC | ||
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Approved Ruling: STC ratings are typically determined in a laboratory under controlled conditions, whereas ASTC ratings are site-specific and established through field testing. The NZGBC advises that ASTC(Apparent Sound Transmission Class) within 5 dB of the required STC (Sound Transmission Class) criteria is acceptable for EHC 9 verification. |
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| TQ134 ECCHO for v4 Projects | V4 | EHC | ||
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Approved Ruling: Your request that projects using Homestar v4/4.1 be able to use the Homestar v5 ECCHO modelling tool to demonstrate compliance in EHC-1 in place of another energy modelling tool is APPROVED. The NZGBC allows the use of PHPP models under v4, and as ECCHO is built on PHPP, this tool is also acceptable. Please ensure you are using the latest version of ECCHO available to assessors on the Assessor Resources page of the NZGBC website. |
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| 118 - V4.1 | V4.1 | EHC | ||
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Approved Ruling: The request to use the window to wall area ratio rather than the window to floor area ratio to establish eligibility/ determine reference building glazing (in EHC-1) in apartments where all walls are external (i.e. no intertenancy walls) is AWARDED. This is because the use of the window to floor area ratio rather than window to wall area ratio in apartments and terraces is due to the presence of intertenancy walls, which are lacking in this project due to breezeway- corridors. Please note that this type of construction performs less thermally than a similar apartment building where corridors are within an insulated and enclosed corridor, due to the presence of high amount of heat loss surface area with respect to the size of the dwelling, and are thus not encouraged. |
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| TQ177 Temperature Logging if there is no fixed heating | V4.1 | EHC | ||
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Approved Ruling: NZGBC advises that the temperature logging results would not be appropriate to show compliance for this credit. Also, we are curious as to how this would be available at the time of certification. Hence to show compliance for the credit without a heating source, an ECCHO or dynamic simulation modeling would be required to show that the house would be thermally comfortable or below 15kwh/m2a heating demand. See appendix B of V4 Technical Manual. |
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| TQ122 Uncovered Guest Cycle Parks | V4 | STE | ||
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Approved Ruling: Request to have uncovered guest cycle-parks counted towards the cycle park requirements of STE-4 is APPROVED. Guest cycle-parks may be uncovered as the bikes are not usually parked for long period of times and this is consistent with Green Star as well. |
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| TQ161 Bath capacity to overflow | V4.1 | WAT | ||
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Approved Ruling: In both v4 (WAT-1) and v5 (EF3) of Homestar, NZGBC advises that the capacity of any bath installed to be reported as ‘the capacity to overflow’. It is common for baths in New Zealand to be installed without an overflow (since the plumbing regulations require a floor waste anyway). As such bath capacities are often reported in product literature as the ‘working volume’ which is 50mm from the lip of the bath, rather than 50mm from the overflow where one is present. The equivalent ‘capacity to overflow’ of baths without overflows can be assumed to be 80% of the working volume and this figure can be used in the Homestar water calculators. |
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| TQ164 Conditioned Floor Area definition | V4.1 | DRE – Density and Resource Efficiency | DRE | |
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Approved Ruling: NZGBC clarifies that for Multi-Use residential projects it is acceptable to calculate the conditioned space from the internal edge all unit walls (i.e. for external walls between a conditioned and unconditioned space, as well as intertenancy walls) As the space considered is the area within the thermal envelope that could maintain a temperature band of between 20-25 degrees Celsius for 365 days of the year. Thus, there is no need to include half of the thickness of intertenancy walls. However, Project Assessor may continue to use the existing definition in the V4/4.1 Homestar Technical Manual. |
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| 74 - V4 | V4 | STE | ||
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Approved Ruling: The TQ to award full points for STE-1 is awarded as the entire land area is under roof, and all roof stormwater is managed. |
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| 76 - V4 | V4 | EHC | ||
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Approved Ruling: The request to allow this project to claim points for EHC-3 under passive ventilation even though some ground floor windows do not have restrictors (to prevent against intruder entry) is APPROVED. This is because these windows are too small for a human intruder. |
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| TQ190 - V5 FSC Chain of Custody | V5 | EN3 - Sustainable Materials | ||
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Approved Ruling: The NZGBC advises offsite manufactured Homestar projects seeking to claim points for using FSC timber that the final product will not hold an FSC claim because there is a break in the chain of custody from an FSC perspective. However, if the chain of custody is not broken until arriving at the manufacturing site (see below on how to provide evidence of this), the project must demonstrate how the factory manages inventory and the percentage of FSC timber used on the project. This can be achieved by providing a quality assurance process documentation or alternative to confirm that the manufacturer has been careful to use the FSC timber for the specified project. In addition, document the percentage of FSC timber used for the project. Otherwise, the project would not be eligible to claim Homestar points for using FSC timber except the factory is FSC-certified. |
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| TQ186 Slab R-value using BRANZ HIG | V4.1 | EHC | ||
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Approved Ruling: NZGBC advises to use the 6th edition of the BRANZ HIG (House Insulation Guide) to calculate the R-value for a waffle pod slab with edge and under slab insulation. Please note that all projects using the BRANZ HIG are expected to use the 6th edition. Find the link below and see the photo example. |
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| TQ156 Eco-label for Colorsteel and Zincalume | V5 | EN3 - Sustainable Materials | ||
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Approved Ruling: To achieve the aim of the credit MAT-NZGBC maintains that each product to their final stage (i.e., whole assessment) needs to be evaluated to be considered sustainable. Thus, the final stage of rollforming for NZ steel’s product needs to be captured for points to be achieved in the EN-3 credit. |
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| TQ131 Adiabatic Surface for Adjoining Conditioned Space | V4.1 | EHC | ||
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Approved Ruling: NZGBC is issuing the following guidance for mixed-use developments where residential dwellings share an intertenancy floor, wall or ceiling with a commercial, retail, hotel or other non-residential space. In mixed-use buildings where an intertenancy wall, floor or ceiling (hereafter referred to as a ‘partition’) is shared between residential dwelling and an adjacent non-residential space, that partition can be considered adiabatic if the adjacent space is conditioned, and any air gaps within the partition itself is edge sealed and not exposed to unconditioned ambient air (refer to Homestar v4 guidance on treating intertenancy walls). The adjacent space can be considered conditioned if either: a) It is not an industrial building AND it is part of a building with a Green Star rating of 4 star or above, or, b) its building envelope is insulated to meet NZ building code, clause H1.2a, H1.3, and is designed to maintain an indoor temperature of 20˚- 25˚ at least 50% of the day. |
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| TQ138 Accounting for Vertical Shading | V4 | EHC | ||
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Approved Ruling: The TQ request to treat vertical shading in the form of a 0.6m deep inset 0.5m from a glazed door as 0.6 deep horizontal shading above the door is NOT AWARDED. However, NZGBC acknowledges that guidance already provided in the Homestar Technical Manual does not address this scenario. Therefore, NZGBC has produced guidance on how to treat vertical shading (see linked file "Shading Ratios for vertical reveals" For calculation methodology and reference tables. |
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| TQ173 Multi Unit slab calculation | V4.1 | EHC | ||
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Approved Ruling: The NZGBC advises that the internal slab perimeter can be excluded as the slab appears to be joined, making it continuous even though there is a set down. The internal perimeters are not exposed to external conditions. In that case, option 1 would be appropriate for slab 4. However, if there was a gap between the slabs, that would make it independent of the other slab and exposed to external conditions. Then the internal perimeter would be included in the perimeter measurement. |
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| TQ141 GSAP as Responsible Contractor | V5 | EN6 - Responsible Contracting | ||
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Approved Ruling: The Green Star Accredited Professional accreditation within the MAN-3 (v4.1) and EN6 (v5.0.2) Responsible Contracting credit is recognzied. Like Homestar, Green Star recognises good construction waste practice on site, rewards the use of sustainable products and are aligned in several other areas. Thus a GSAP should have a similar understanding to a Homestar Assessor in terms of environmentally responsible practice onsite requirements for green buildings and homes. |
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| 2 - V4 | V4 | EHC | ||
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Approved Ruling: Corridors that (1) face the inside of a building i.e. communal care and/or circulation areas and (2) will be heated and cooled via a centralised HVAC system can be classified as conditioned spaces. |
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| TQ139 Waste Minimisation from Offsite Construction | V4.1 | WST | ||
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Approved Ruling: The TQ requesting 3 Points for WST-1 based on total onsite waste sent to landfill (kg per m2 of site) is within 10 kg/m2 although no quantification is available for waste generated during offsite construction, is accepted. To be clear WST-1 in Homestar v4.1 (which this project is registered under) only accounts for waste generated on site, as waste from offsite assembled components are often difficult to quantify, AND reporting from overseas* suggest that offsite construction helps significantly reduce waste from construction. Hence this project is eligible for points to be awarded solely based on waste generated onsite. |
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| TQ142 Area definition of main bedroom | V4.1 | EHC | ||
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Approved Ruling: Bedrooms are calculated on the square footage area of flooring of the actual room to determine compliance for EHC-7 Natural Lighting. The Master bedroom is most often the largest room, however a room that has more adjoining facilities like ensuites and walk-in wardrobes would likely be treated as the master bedroom despite a smaller habitable floor area. In terms of achieving compliance, we accept the Master bedroom as the smaller room with adjoining facilities. |
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| TQ175 CPTED and surveillance camera system | V4.1 | MAN | ||
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Approved Ruling: Homestar approves CPTED and surveillance camera system with appropriate lighting as an alternative for the MAN-1 credit. Homestar cites CPTED in MAN-1 and they are good guidelines. |
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| TQ165 Sliding door for ventilation | V4.1 | EHC | ||
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Approved Ruling: It is a requirement for habitable spaces to have a reliable and practical means of ventilation and in this case, the project seeks to use the intermittent extract pathway which means reliance on passive ventilation for habitable spaces. Therefore, having the slider as the only source of ventilation can be problematic for a space that is a kitchen, dining, and living area. Because while the slider can be very useful during the day in the summer when the space is in use and/or occupied this may not be the casein the winter. Furthermore, leaving a sliding door open at night in any dwelling raises security concerns. In the case of a care/retirement facility, it can leave both staff and residents feeling unsafe. Hence, the slider is likely to be closed. Thus, NZGBC advises the project to seek alternative means of compliance by considering a ranch slider with an awning window. This also gives building occupants/users control over their space. |
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| TQ210 Cresco Waffle Suite Software | V4.1 | February 2024 | EHC1 - Thermal Comfort | EHC |
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Approved Ruling: The request to use the Cresco Waffle Suite Software to calculate the R-value of the R-value of the Firth Xpod Foundation system (Plastic Dome / air void spacer) in place of using the ‘Generic Slab / solid concrete foundation’ as per the Homestar V4.1 Manual page 197 which states "If the core is air-filled, treat as if solid concrete’ is denied. The Cresco website states that “Wafflesuite™ is a software that runs calculations of waffle rafts in compliance with AS2870 Appendix F.” [1] and the Australian standard website states that AS2870 Appendix F - (informative) deals with the soil structure interaction analysis for stiffened rafts. This is structural engineering software rather than thermal modelling software and it is unclear if this software can calculate ground temperatures from slab geometry or uses ISO13370 to estimate ground impacts on heat loss or accurately model 3D heat loss in accordance with EN ISO 10211. Whilst the Wafflesuite calculation methodology does include reference to ISO13370 in section 5 on page 27 it merely states that “a layer of coarse-grained compacted engineered fill that is placed immediately under a waffle raft foundation may be modelled in a thermal analysis conducted in in accordance with ISO13370” not that this modelling has actually been undertaken in accordance with ISO13370. The reference to ISO 6946 is in section 5.2 on page 28 and states “when foil insulation is used, the compliance with building code is demonstrated via an alternative solution (ISO6946)”. Again not that modelling of the specific product has occurred in accordance with this ISO standard. In addition foil insulation is banned for use in New Zealand. [1] https://www.cresco-group.com/driving-innovation/ |
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| TQ213 HS v4.1 Extension Conditions | V4.1 | February 2024 | ||
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Approved Ruling: An exemption beyond 31st January 2026 can be arranged under extenuating circumstances. This must be confirmed in writing by NZGBC. Updates to the building code (specifically H1 5th edition), finalised in November 2023 will require insulation levels to match or exceed the insulation requirements of Homestar v4.1 for heat loss. However the ventilation requirement of the building code have not changed, nor is there any requirement to consider the risk of overheating. In order to manage the reputational risk to Homestar, to incentivise improved design where possible, and to inform home occupants, NZGBC requires the following as a condition for granting an extension to the submission date of Homestar v4.1 projects: 1. A risk assessment of overheating is to be carried out. This should be done in accordance with CIBSE TM59, or similar. 2. The submission must included a summary report of the overheating risk assessment. The report should also include any planned or possible mitigation measures. Project teams are reminded that projects may be upgraded to Homestar v5 at any stage prior to submission, at no additional cost. Every effort should be made to fulfill the performance objectives of Homestar v5, which may include the application of further TQs. |
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| TQ214 IT Wall STC and ASTC Difference | V4.1 | March 2024 | EHC9 – Sound Insulation | EHC |
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Approved Ruling: NZGBC allows 5 dB difference provided the ASTC ( Performance measured in the field) is not more than 5 dB below the STC58 (Performance of a system in the laboratory). In your case, the specified IT wall system has an STC rating of 58, while the field test resulted in an ASTC rating of 53. A difference of 5 points between the specified rating and the field test result is not uncommon and may fall within acceptable tolerance levels in many cases. NZ Building Code specifies that walls and floor/ceiling assemblies must achieve a Sound Transmission Class rating of at least STC 55 in laboratory. A 5 point leeway is permitted on site, so that the minimum requirement on site is ASTC 50 (Field Sound Transmission Class). |
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| TQ206 Fixed Heat pump heating capacity for the whole house with Balanced Heat Recovery Ventilation System | V5 | HC1 - Winter Comfort | HC | |
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Approved Ruling: 100% heating by the heat pump installed in the living area is accepted considering a combination of the set criteria below has been met. • Highly insulated envelope • Ducted Ventilation • Thermostats in separate rooms with direct control to heat pump • Heating demand of total conditioned space relative to the capacity of the heat pump The heat transfer aspect is being satisfied due to the heat pump heating capacity, its auto -functionality along with high-performing envelope and ventilation equalizing the overall house temperature on a constant basis. |
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| TQ209 Alternative method to calculate area for heating | V5 | HC1 - Winter Comfort | HC | |
| TQ204 Embodied Carbon Guidance | V5 | October 2023 | EN2 - Embodied Carbon | EN |
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Approved Ruling: This is a broad guide for what to include when accounting for (custom) materials in the Homestar Embodied Carbon Calculator (HECC). When all materials in the “must include” section are included, it is estimated that 95% of the total embodied carbon for the most common construction assemblies in New Zealand will be accounted for. Must Include Walls : Cladding Structural framing Internal linings (e.g., GIB) External paint (e.g., applied to weatherboards, if included) Internal paint Cavity Battens Insulation Roofs: Cladding Structural framing Ceiling lining Internal paint Insulation Purlins Suspended Timber Floors: Flooring Structural framing (joists, bearers, piles) Pile footings Subfloor linings. Insulation Concrete Slabs: Concrete (slab and footings) Reinforcing steel Basecourse/fill Underslab insulation (e.g., EPS) Edge protection Membranes (e.g., DPC) May Exclude : Internal paint applied to cornice and skirting. Exterior primer Cornice Interior primer Cavity vent strips Building wrap Skirting Fixing straps Adhesives Fixings Interior primer Building wrap Adhesives Fixings Membranes Adhesives Fixings Sand blinding Flashings Edge insulation Formwork Accessories to slab (e.g., bar chairs, wire) Adhesives |
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