 | A building can be designed to reduce its environmental impacts e.g. energy, water and other resource use. There are many ways to create sustainable, environmentally friendly buildings. Important choices can be made at every stage from design through to construction and the materials or products used inside.
The main issues to consider in the design stage are:
Get the Location Right
Design for the Sun
Minimise Earthworks
Minimise Construction Waste
Choose Materials Carefully
Then consider what’s going into the building…
Alternative Energy Sources
Lighting
Heating, Ventilation & Cooling Systems
Reduce Hot Water Demand
Conserve Water
Paints and Oils
Floors & Coverings
and what’s surrounding the building
Office Gardens
Reduce Stormwater Run-off
Get the Location Right
Whether building new premises, or simply relocating to another building, choosing a good location is critical. From an environmental, as well as people-friendly point of view the following should be considered:
- Access to public transport (train, ferry, bus or cycle ways)
- Existing vegetation to provide temperature control and improved air quality (as well as providing a more pleasant environment for staff during breaks)
- Consider other accessibility issues (e.g. wheelchair access)
- Consider noise and air quality from neighbours, roads etc
For more information on urban design {link to councils and consultants}
Design for the Sun
The main idea with office building is to keep the heat out, i.e. minimising solar gain! See Passive Solar Design (note that small office buildings act the same as large homes)
The office equipment and lighting will generally make cooling a bigger requirement than heating. Engage a professional designer and engineer (for larger projects). Some of the issues to consider are:
- Maximise natural ventilation and cooling through good orientation and cleverly places windows and vents. E.g. Letting air in through vents near the ground on the southern side and out through clerestory windows.
- Minimise glazing on the western side (or provide shading) to avoid afternoon overheating.
- Use exposed mass (such as concrete) to create a more stable indoor temperature.
- Insulate to levels higher than the current codes require. (See
www.waitakere.govt.nz and refer to the Better Building Code)
Minimise Earthworks
Major earthworks can have a negative impact of streams and waterways. There are a number of ways of reducing this including:
- Designing the building to conform to the natural contours of the land.
- Stabilise earthworks by grassing/ vegetation before the ground temperature drops in June.
- Placing adequate silt control measures prior to beginning earthworks and cleaning them regularly.
- Planting in autumn is good in terms of reducing watering needs.
Refer to Auckland Regional Council website and publication TP90 Erosion and sediment control guidelines for land disturbing activities in the Auckland region, 1999
Minimise Construction Waste
Design to Minimise Waste
Designing simple, modest structures, and using standard material and product sizes will mean fewer resources are used in the construction stage.
- Choose materials that do not need to be finished (natural wood ceilings, tiles or bricks)
- Keep accurate ‘as-built’ drawings throughout the construction phases. This saves a lot of time and money if, or when changes are made or extensions are added. It is most applicable for electrical and air conditioning systems for saving maintenance dollars. Maintenance people can find things more quickly and understand more of the system.
Dealing With Waste
- Develop a waste management plan for all wastes taken off site. Ask waste contractors if they can sort waste on site (e.g. wood, gypsum, paper/card, metal, plastic). Contact the Recycling Operators of New Zealand to find out who recycles construction waste in your area.
- Look for opportunities to reuse any materials (e.g. wooden form-work for concrete or scaffolding maybe given to not for profit organisations, e.g. conservation organisations for footpath maintenance).
Choose Materials Carefully
Consider the life cycle issues of associated with products. You should weigh up the various attributes of those products for e.g.:
- Has it come from a renewable, sustainably managed resource (e.g. timber)?
- Is it sourced locally (grown or manufactured in New Zealand)?
- Is it good quality and designed to last?
- Is it toxic when in use?
- Is the manufacture of the material safe?
- It is the material recyclable or upgradeable?
- What is the embodied energy content? ( For information on embodied energy of construction materials see
EBEX 21 )
Timber
There are a number of considerations to make when purchasing timber for an office. We recommend you check out the Good Wood Guide prior to choosing a timber.
The main issues to consider are:
- Is it grown in a plantation forest that has Forestry Stewardship Certification?
- What has it been treated with? (e.g. PCP/ Dieldrin)
Last updated at 7:45pm on 12 June 2002
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