Landcorp’s WGV estate was chosen for its sustainability features (including One Planet Living international endorsement), proximity to Fremantle centre, the amenity of the surrounding suburb as well as Booyeembara Park across the road. Purchased in January 2016, Lot 4 WGV (274sqm) was our preferred lot in the estate from an environmental design perspective. It was chosen for its east-west orientation, unobstructed solar access and clear view north up Beazley Way towards the large trees and POS along Stevens St.
Richard Hammond has a long history of achievement in affordable and sustainable housing design. His assistant in this design was graduate architect David Robinson. Passive solar design was a strong focus in the design approach. The development consists of two strata-titled apartments on a single lot 274sqm, with shared amenities including: roof terrace, double garage, laundry, outdoor shower/toilet and gardens. The design complies with the WGV Design Guidelines as well as City of Fremantle sustainability policy. NatHERS energy efficiency rating completed by True North was 7.7 for apartment A and 7.3 for apartment B, or 7.5 overall. Life cycle assessment by eTool gave it the top Platinum rating with total emissions expected 823 kgCO2e per year per occupant = a savings of 80%, equivalent to 6,735 trees planted.
A traditional Nyoongar smoking ceremony by Marie Taylor was held on the lot prior to construction. First round tender $680,000; second round $580,000, third round $480,000 from Ecovision accepted. Ecovision Craig Bailey runs his practice based on 7 sustainability principles. During construction several design modifications were implemented including roof change from SIPS to studframe and addition of external insulated cladding to south wall expecting the NatHERS rating to improve by 0.7. Construction time was 12 months as per contract completing in February 2018.
Ground floor walls are stabilised rammed earth (SRE) comprised of 50/50 recycled C&D waste and limestone. Floors are Holcim Ecomax concrete with lower embodied energy. Upper floor walls are 90-mm insulated stud frame with custom orb Colourbond cladding. Roof is Colourbond with R4.0 insulation + R1.5 Anticon. Double glazed windows throughout. In Perth, over 40 tonnes of waste per house is generated during construction with over 15,000 homes constructed each year. Much of this waste could be recycled back into new constructions, as demonstrated here.
Grid electricity consumption reduced by over 50% with energy efficient design and appliances as well as a shared 5kW solar PV system driving the HVAC and thermal mass as a ‘thermal battery’. Electrochemical battery may be installed at a future date if necessary. Electric car and bike charging can occur in the garage later or at the SHAC charging station next door.
While mains water from Water Corp is connected, much water is supplied from shared alternative systems. Toilet flushing and clothes washing is by rainwater, surface irrigation water from the WGV community bore, and subsurface irrigation from greywater. It reduces mains water consumption by over 50%.
DHW, HVAC SYSTEMS
Hot water, space heating and cooling is provided by a 3-in-1 heat pump shared system via hydronic tubes in the ground floor slab and a single FCU in each apartment upstairs. Efficiency of space heating and cooling will be enhanced by attention to sealing around doors, windows and frames, checked by blower door testing. Operation of the integrated solar heat pump system with smart controls will allow the house to perform as a novel “thermal battery” with energy savings expected to be greater than 20%.
This house achieved a NatHERS rating of 7.5 stars using NatHERS accredited software (AccuRate). Find out how the star ratings work on the Nationwide House Energy Rating Scheme (NatHERS) website.
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