At Baxter Construction we are accredited with the Master Builders Green Living Program and our aim is to utilise the most durable building techniques at the lowest cost, - focusing on energy efficiency, water savings and indoor air quality - so you can build in a stronger, more sustainable and resilient way.
This document has dozens of different technologies to help build a more sustainable home including building design, building materials, power, water, heating and cooling, appliances, floor coverings, paints and finishes, backyards and more.
The types of materials selected at the design stage of building a home will impact fundamentally on its longer-term sustainability. These choices have implications for saving energy, improving bushfire resilience and improving comfort. Building materials typically considered to be 'green' include renewable plant materials like straw and mud brick, timber from forests certified to be sustainably managed, recycled materials and other products that are non-toxic, reusable and renewable.
• Toxicity - Some common building products emit unpleasant and even dangerous fumes that can persist long after homeowners have moved in.
• Durability - Building materials that hold up to the rigors of family life are worth the investment over the long term.
• Resource conservation - Reusing salvaged materials or choosing products that have been made with recycled material means fewer resources have to be committed to making something new.
• Sustainability - As with other building materials, floor and wall covering come from a variety of sources. The best choices are products that are renewable.
The BCA rates homes thermal performance in terms of star ratings with 1 being the worst and 10 being the most efficient. Currently Victoria’s domestic Star Rating System is 6 Star. This means that more than ever the importance of passive design and dwelling orientation should be incorporated into your homes design.
Energy rating is achieved by either the deemed to satisfy provisions of the building code or a computer simulation that estimates the amount of energy required to heat and cool the home. The software factors in the building fabric and location. The software used is either, FirstRate, Accurate or BERS and the rating must be completed by an accredited energy rater.
• Factors to consider:
• It does not take into account add-ons such as solar power.
It’s important to know which climate zone the house will be built in; as you will need to adapt your homes design to suit the correct climate. By doing this your home will be more comfortable and easy to heat or cool.
Australia has a wide range of climate zones on a scale from 1 being high humid summer and warm winter to 9 being alpine conditions. In Victoria the climate will vary depending on where you are located but will be in between zones 4 and 8.
See the table below to learn which climate zone your dwelling will be located in as this will then enable you to design the home correctly.
In Victoria all the climate zones 4 to 8 recommend solar passive design principles with good insulation and use of thermal mass. It is important to note that differences with reference to glazing and shading depend on your specific climate zone.
Planning/ Design Stage
Building a sustainable home starts with careful lot selection. Avoid long thin sites that run north-south as it is harder to achieve the 6 Star standard.
• Plan efficiently, consider building to allow easy future staged extensions;
• The larger the house the more resources needed to construct it and the more energy needed to heat and cool it; and
• See how you achieve the same functionality using less m2 (e.g. efficient layouts, good storage design, etc.)
• Place your living areas to the north side of the home to assess the winter sun;
• Maximise winter sun to living areas and solar collectors;
• North-facing facades receive the sun for the longest part of the day and are easiest to shade in summer;
• Put utility rooms such as laundries and bathrooms to the south side as they don’t need a lot of light; and
• Create separate zones that can be independently heated or cooled.
Works by using high-density materials (less trapped air) such as concrete on a floor slab or on a wall in the interior of your home. As part of a passive design, thermal mass is helpful in regulating the internal temperatures in comparison to the outside world.
Thermal mass is the ability to absorb, store and rerelease heat, which moderates indoor room temperatures.
Having your living rooms orientated to north means it’s important to have external shading devices to prevent the summer sun entering the living rooms. As the sun is higher in the sky in summer they can be appropriately sized to keep out the summer sun, but let in the winter summer, which is lower in the sky to warm the house.
Glazing is an important component of your homes thermal efficiency and design. Concentrate your glazing to the northern and eastern sides, put utility windows to the south and use a small amount of glazing on the west side.
Adds marginal extra cost for a big impact on thermal comfort and contributes to achieving the new mandatory 6 star standard.
Important factors to consider:
Where possible, choose products that:
Be aware of where the timber you’re using is coming from. Ensure that it is recycled, plantation, Forest Stewardship Council Certified or Australian Forestry Standard Certified.
Consider using recycled materials or products that have recycled content such as concrete or steel.
It is important to consider what fitout materials are made from. Many materials can contain harmful airborne pollutants such as Volatile organic compounds (VOCs). These can be found in commonly in paints, manufactured wood products, adhesives, vinyls, Carpets and synthetic underlays. Use materials which are low in or have no VOCs. For more information see www.greenpainters.com.au
Photovoltaic systems are used for domestic renewable electricity systems in Australia and are good way reduce the houses impact on the environment and achieve lower power bills.
As well as building a sustainable home it is important to consider external factors such as water management. In Victoria as part of the 5 star requirements you need to have either a water storage tank plumbed to the toilet and laundry or solar hot water needs to be installed.
To make your home more water efficient consider having both a water tank and a solar hot water system this will save you money on your hot water bills and you will have more water from rainwater to use on toilet flushing, laundry or the garden.
If your client was interested in recycling their water they could use the waste greywater from showers, laundry and basins. It is also important to consider the safe use of this water as many laundry powders are high in salts and nutrients and can kill plants. If this water is not being treated it must not be stored for more than 24 hours and should only be distributed via subsurface irrigation. This water must also not leave the property on which it is generated.
Consider creating raingardens to control stormwater runoff and reduce the amount of watering your garden consumes using plants which grow locally. When creating paths and driveways use materials that are pervious so that storm water will run into the soil beneath instead of clogging the stormwater drains.