The design of a building plays a key role in how efficiently and sustainably it can function.
While architects normally view each building’s design and functionality from a wholistic perspective, sustainable architects specifically aim to design a building that will support the local ecosystem, be energy efficient and protect valued resources. Their goal is to assess what’s already there and design and build the structure such a way that effectively utilizes the resources available.
These days, sustainable architecture involves not only an analysis of the efficient use of resources, but also an examination of the relationship between humankind and the environment within different geographical and political contexts. Regardless of the context, however, there are seven essential aspects of sustainable architecture that should be taken into account.
We can’t talk about sustainable architecture without first talking about Leadership in Energy and Environmental Design (also known as LEED). LEED standards are nearly universal green building standards governed by the United States Green Building Council, which offers official LEED certifications for green buildings.
All over the world, many new buildings strive to meet the strict LEED ratings when it comes to their architectural design. This involves the highly efficient use of energy and resources, not only in regard to construction plans (construction is traditionally a massive source of waste and pollution), but more importantly, in terms of the functionality of the building itself.
Building Information Modeling
Building Information Modeling (BIM) provides a way for architects to quantify the environmental impact of a building from the time of its construction, all the way through its life cycle.
This type of modeling can have an impact on measures that might save land, water, energy and materials, by providing architects with modeled simulations during the design phase.
Net-zero buildings are becoming a highlight within the field of sustainable architecture. These buildings harness and effectively use renewable resources in such a way that negates the level of carbon emissions produced by the construction and maintenance of each building. Thus, net-zero carbon emissions!
Active vs. Passive Strategies
There are both active and passive components of sustainable architecture. Passive strategies involve designing something that’s efficient enough to provide an advantage without added effort or energy; for example, room designs that allow for passive ventilation, heating or cooling. Strategic building orientation and site selection play a large role in the passive strategies that will be available for a particular project.
A site analysis is an important part of sustainable architecture because it gives an architect the opportunity to assess the natural and renewable resources that are already available at a particular site. Aspects examined during this type of analysis might include:
- The amount of sun exposure available for solar panels
- The wind speeds available for wind turbines
- Whether there’s easy access to a natural source of running water that can be used in conjunction with a water turbine
Sustainable Energy and Air Flow Systems
Efficient heating, cooling and ventilation are cornerstones to sustainable energy, and effective insulation is vital to maintaining an acceptable temperature within a building.
Here are three fairly common examples of passive airflow systems:
- Strategic room orientation
- Utilizing a decreased surface area in favor of a more centralized building
- Selecting a certain ratio in terms of building height versus street width to allow for better air flow
Passive solar designs include window choices that can maximize the amount of heat absorbed in cooler months, while also preventing too much heat from entering in the warmer months. Vegetation around a building—even in the form of a green roof—also adds to a building’s insulation and its temperature regulation. Choosing materials that have a high thermal mass, which can provide an added layer of temperature control, is yet another important element of sustainable architecture.
Active systems can include those that recapture energy waste, such as those that recycle hot water and stale air, combining each with new, incoming water and air to be recycled.
Active solar systems, such as photovoltaic cells and hot water panels, are commonly included in sustainable architectural design. These need to be installed strategically so you can make the most of any sun exposure that a building gets!
In addition to providing electrical energy, solar systems that heat water with hot water panels are also available. These are passive solar systems; however, they provide far less water than an active system. Wind and water turbines are less accessible than solar power, but are still important considerations for sustainability-focused architects to think about during a site analysis.
Green Materials and Processes
Construction is a highly wasteful process, traditionally speaking. Thus, sustainable architecture necessitates choosing sustainable materials and processes. Sustainable building materials are becoming more and more mainstream, and any architect focused on sustainability and green buildings will be knowledgeable when it comes to appropriate options.
Recycled materials are being used more and more, in order to redirect waste from landfills after demolition. Reclaimed lumber, bricks and metals such as copper are popular recycled materials. The concept of retrofitting and repurposing an existing building, to prevent demolition and the associated waste, is another popular option. Sometimes, this can actually be more cost-effective than a complete tear-down!
Other sustainable materials are those that are renewable in such a way that the supply can keep up with the demand. My favorite example is bamboo! Bamboo grows at a rapid rate, without the need for lots of harmful chemicals, which makes it an excellent material to be used to craft a wide variety of large and small items.
Volatile Organic Compounds (VOCs) are carcinogenic, irritant chemicals that are often included in traditional building materials such as paint and insulation. These compounds are not only harmful for humans, but also for the environment. There are now alternative types of insulation that are low in VOCs, such as wool and recycled denim, and these can be treated with non-toxic substances to ward off mold and pests. There are also low-VOC paints, such as organic and milk-based paints.
Eco-Friendly Waste Management
Finally, sustainable architecture also needs to account for the waste we produce as humans! Grey water management systems that collect and recycle non-harmful grey water, composting toilets that reduce sewage, compost collection systems for gardens and other recycling systems are all sustainable features that should be included in the design of a green building.
Remember—Chemicals Aren’t Always Bad!
It’s important to note that just because something is “natural,” that doesn’t mean it’s inherently harmless, and just because we call something a “chemical,” that doesn’t mean it’s necessarily harmful. We must make the distinction between what’s truly toxic or harmful, and what’s not, when we look into sustainable and safe materials.