Published on June 12, 2008
Creating homes and neighbourhoods that work well into the future and don’t cost the Earth High Standard of Sustainability™ Presentation to SHaC 11 June 2008, Dr. Megan Howell Beacon Pathway Limited
Beacon’s Goal for NZ housing • “That 90% of New Zealand homes reach a high standard of sustainability by the year 2012.” • But what, exactly, is a high standard of sustainability? How should such a house perform?
Parameters of the HSS • The HSS is: – A measure of home sustainability. – The underlying standard promoted through a range of tools. – Based as far as possible on measurable performance indicators. – Defined within the confines of what is reasonably achievable for the mass market today. – Designed to reflect Beacon’s priority issues and policies. • The HSS is not a rating tool.
Policy issues and priorities • Affordability and future flexibility (creating homes and neighbourhoods that work well into the future and don’t cost the Earth). • Focused on the physical fabric of dwellings, as opposed to more behavioural approaches. • Treats house as an interdependent web of design choices, rather than focusing on one or two priority areas.
HSS™ Targets • 35% reduction in energy use in new homes Energy • 15% reduction in energy use in existing homes Water • 40% reduction in water use in both new and existing homes Indoor • Average indoor environment temperatures meet WHO Environment minimum standards Quality • Adequate ventilation without excessive draughts • Provision for waste minimisation during construction, Materials and renovation and operation of homes Waste • Consideration of sustainability issues in the choice of materials used for construction or renovation
The High Standard of Sustainability™ Zone 1 Zone 2 Zone 3 Energy New (kWhr/year/house) 7,600 8,500 9,800 Retrofit (kWhr/year/house) 9,050 11,000 12,000 Water • 180L mains potable water/person/day • Temperature: mean minimum 18⁰c living room; 16⁰c bedroom • Ventilation: 0.4 -0.6 (new), 0.5 – 0.75 (existing) air changes/hour IEQ • Mean relative humidity: 20-70% in bedrooms and living space • Checklist of features for pollutants Materials • Checklist for materials selection and construction waste and guidelines • Checklist covering provision for composting, recyclables, no in- Waste sink waste disposal unit
Performance is interdependent
Energy benchmarks • 35% reduction in energy use in new homes • 15% reduction in energy use in existing homes Zone 1 Zone 1 Zone 2 Zone 3 Warm Zone 2 New 7,600 8,500 9,800 Temperate (kWhr/year/house) Retrofit 9,050 11,000 12,000 Zone 3 (kWhr/year/house) Cooler winters
Energy features • Use of basic energy efficiency measures (eg curtains, draught stoppers); • Use of a solar hot water system; • Energy efficient appliances (eg fridge, freezer, washing machine) and lighting; • For existing homes: ceiling and underfloor insulation to meet “better” recommended values for each climate zone; • For new homes: passive solar design (eg orientation for the sun, minimised southern façade glazing, large northerly windows with high thermal mass heat sink); • For new homes: ceiling, external wall and underfloor insulation to meet “best” recommended R values for each climate zone; • For new homes: double glazing in all climate zones.
Water benchmarks and features Target • 40% reduction in water use in both new and existing homes Benchmark • 180L mains potable water per person per day Features • Low flow fittings (shower heads, taps, no in sink waste disposal unit); • Dual flush toilet or water limiting device for older single flush toilets; • Water efficient appliances (dishwasher, washing machine); • Rainwater tank for garden watering.
Indoor Environment Quality • Average indoor environment temperatures meet WHO Targets minimum standards • Adequate ventilation without excessive draughts • Living room: mean minimum 18⁰c Temperature benchmarks • Bedroom: mean minimum16⁰c • New homes: 0.4 – 0.6 air changes/hour Ventilation benchmarks • Existing homes: 0.5 – 0.75 air changes/hour Humidity • Mean relative humidity: 20-70% in bedrooms and living space benchmarks • Mechanical extract ventilation • Windows with passive venting Checklist of kitchen, bathroom and • Environmental Choice certified laundry paints and finishes • No unflued gas heaters • No air conditioning
IEQ Interactions Temperature Relative humidity Ventilation
Materials and waste • Provision for waste minimisation during construction, renovation and operation of homes Targets • Consideration of sustainability issues in the choice of materials used for construction or renovation • Checklist for materials selection and construction waste guidelines Benchmarks • Checklist covering provision for composting, recyclables, no in-sink waste disposal unit Waste checklist: • Provision for kitchen waste composting or storage space for kitchen waste collection (5L min capacity in kitchen, compost bin or worm farm with 1m3 min space for composting organics on suburban lot sizes, ) • Space for recyclables storage (20L min capacity) • No in sink waste disposal unit • New Building construction or renovation in accordance with REBRI construction guidelines
Materials checklist New Homes: Materials which: • promote good indoor air quality • have minimal health risks during construction or retrofitting • are durable and have low maintenance requirements • incorporate recycled content or can readily be recycled • reuse existing or demolished building materials or can readily be reused • are made from renewable or sustainably managed resources • have low embodied energy including minimal impacts due to transport • have low impact on landfill or are biodegradable • minimal impact on the environment (air, water, land, habitats and wildlife) • have third-party certification (eg NZ Environmental Choice, Forest Stewardship Council) Existing Homes: Materials which: • Retrofit or renovation applies principles from materials checklist where appropriate
Concluding notes • Research underway to confirm benchmarks and develop simple measurement systems • Key messages for Beacon: – Integration between issues key to sustainability – Acknowledge different potential of new and existing homes. • Look forward to seeing SHaC’s design interpretations of the HSS
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