Sustainable Design Principles Flashcards

Question 1

What is the core idea behind sustainable design?

Accepted Answer

Sustainable design aims to meet the needs of people today without reducing the ability of future generations to meet their own needs. It considers environmental, social, and economic effects together, rather than optimizing one at the expense of others. Designers view each project as part of larger natural and human systems.

Question 2

What are the three pillars often used to describe sustainability?

Accepted Answer

The three pillars are environmental, social, and economic sustainability. Environmental sustainability protects ecosystems and limits resource use and pollution. Social sustainability supports health, equity, and community well-being. Economic sustainability keeps projects financially viable over their useful life. Good design balances all three.

Question 3

What does the term cradle to cradle describe?

Accepted Answer

Cradle to cradle describes a design approach in which materials are kept in continuous cycles rather than ending up as waste. Products are designed so that their components can be recovered and reused as biological nutrients that return safely to soil, or as technical nutrients that stay in industrial loops.

Question 4

What is the difference between a closed loop and an open loop?

Accepted Answer

A closed loop system recycles or reuses materials back into the same product cycle, so little or nothing is lost to waste. An open loop system passes materials from one product or industry into another, where they are used differently, often at lower quality.

Question 5

What does design for disassembly mean and why does it matter?

Accepted Answer

Design for disassembly means planning a building or product so its parts can be separated easily at the end of its life. Fasteners are used instead of adhesives, and components are labeled and accessible. This makes repair, reuse, and material recovery practical, instead of forcing demolition that sends usable parts to landfill.

Question 6

What does it mean to design for durability?

Accepted Answer

Designing for durability means creating products and buildings that last a long time and perform well under expected use. Durable designs reduce how often materials must be replaced, which lowers resource use and waste. Long-lasting, adaptable design is often more sustainable than a cheap, short-lived alternative.

Question 7

Why is setting performance targets early in a project useful?

Accepted Answer

Early targets give the design team measurable criteria, such as energy use, water use, or material content, to guide decisions from the start. When goals are set late, changes become expensive and options narrow. Clear targets also make it possible to check progress and to communicate results to clients, users, and regulators honestly.

Question 8

What is integrative design and why does it matter?

Accepted Answer

Integrative design brings architects, engineers, builders, owners, and users into the process together from the earliest stages. Instead of passing a finished plan from one specialist to the next, the team explores how systems interact, such as how daylight affects heating and lighting loads.

Question 9

What is embodied energy and why does it matter for materials?

Accepted Answer

Embodied energy is the total energy used to extract, process, manufacture, transport, and install a material. For materials such as steel, concrete, and aluminum, embodied energy can be significant, so designers compare options by their upfront impacts as well as their in-use performance. Choosing lower embodied energy materials reduces early emissions.

Question 10

Why are locally sourced materials often preferred in sustainable design?

Accepted Answer

Locally sourced materials usually travel shorter distances, which reduces transportation fuel, emissions, and handling. Regional materials also support local suppliers and often suit the local climate. However, local does not automatically mean low impact, so designers still check each product's full lifecycle.

Question 11

What is the difference between recycled content and reclaimed materials?

Accepted Answer

Recycled content refers to material made from waste that was collected and reprocessed. Reclaimed material is an item removed from one building or use and reused in its existing form. Reclaimed items usually need less processing, so they often carry lower embodied energy, but their condition, consistency, and performance must be checked carefully.

Question 12

What is a low toxicity material and why is it chosen?

Accepted Answer

Low toxicity materials contain few substances that release harmful compounds during manufacture, installation, use, or disposal. Choosing them protects workers, occupants, and ecosystems, and it reduces the risk that materials will need to be treated as hazardous waste at the end of life.

Question 13

What does the term biobased material mean in design?

Accepted Answer

Biobased materials are made wholly or partly from biological sources such as plants, trees, algae, or agricultural residues. Their sustainability depends on how the biomass is grown, harvested, and processed, since poor forestry or heavy fertilizer use can offset their advantages. Designers should verify sourcing rather than assume renewable origin means low impact.

Question 14

What makes a material rapidly renewable, and why is that useful?

Accepted Answer

A rapidly renewable material is one that can be regrown or replenished within a short human timeframe, typically far faster than conventional timber or mineral resources. Bamboo and cork are common examples. This quality reduces pressure on slow growing resources, although harvesting must still be responsible to avoid soil loss and habitat damage.

Question 15

Why is the reuse of building components valuable?

Accepted Answer

Reusing building components keeps existing materials in service, which avoids the energy and emissions needed to manufacture replacements. It also reduces demolition waste and can preserve the craftsmanship and character embedded in older elements. Successful reuse requires early identification of salvageable items, careful removal, storage, testing, and documentation.

Question 16

What is the purpose of a material palette in a design project?

Accepted Answer

A material palette is a deliberate, limited set of materials chosen to meet performance, aesthetic, and environmental goals across a project. Keeping the palette small simplifies detailing, reduces the number of suppliers and waste offcuts, and makes maintenance and future recycling easier.

Question 17

What is passive design and how does it reduce energy use?

Accepted Answer

Passive design uses a building's orientation, form, materials, and site features to provide comfort with little or no mechanical energy. Instead of relying on pumps, fans, and heaters, the design harnesses sunlight, natural ventilation, thermal mass, and shading. Good passive design is usually cheaper to run over time.

Question 18

How does orientation influence a building's energy performance?

Accepted Answer

Orientation determines how much solar heat and daylight reach each facade through the year. In the northern hemisphere, long east and west facades receive low, intense sun that is difficult to shade, while a south facade can capture winter sun and be shaded with simple overhangs.

Question 19

What is thermal mass and how does it help?

Accepted Answer

Thermal mass is the ability of a dense material, such as concrete, stone, or rammed earth, to absorb, store, and slowly release heat. In spaces with large daily temperature swings, thermal mass can smooth indoor temperatures by absorbing excess heat during the day and releasing it at night.

Question 20

What is daylighting and why does it reduce energy use?

Accepted Answer

Daylighting is the controlled use of natural light to illuminate interior spaces. Because daylight can replace electric lighting during working hours, it lowers lighting energy and the internal heat that lamps release, which can reduce cooling demand. Good daylighting balances glare, heat gain, and view.

Question 21

Why does airtightness matter in an energy efficient building?

Accepted Answer

Airtightness describes how well a building envelope resists uncontrolled air leakage through gaps, joints, and penetrations. Leaky envelopes waste heating and cooling energy, allow moisture to enter wall assemblies, and can cause uncomfortable drafts. Designers achieve airtightness with continuous air barriers, careful detailing at junctions, and testing during construction.

Question 22

What does a heat recovery ventilator do in an airtight building?

Accepted Answer

A heat recovery ventilator exchanges indoor and outdoor air through a core that transfers most of the heat from outgoing air to incoming fresh air. In an airtight building, this allows continuous, controlled ventilation without losing much of the conditioned air that has been heated or cooled.

Question 23

What is the role of insulation in reducing heat loss?

Accepted Answer

Insulation slows the flow of heat through walls, roofs, and floors, so less energy is needed to keep interior spaces warm in winter and cool in summer. Its effectiveness depends on continuity, because gaps, thermal bridges at structural members, and poorly sealed joints can undermine even thick layers.

Question 24

How do renewable energy sources support sustainable design?

Accepted Answer

Renewable energy sources such as solar, wind, geothermal, and hydropower provide energy from flows that are naturally replenished. On buildings, designers combine on-site generation, such as photovoltaic panels, with efficiency measures, because reducing demand first makes the renewable supply go further.

Question 25

Why is reducing potable water use important in building design?

Accepted Answer

Potable water is treated to drinking standards, so using it for toilets or irrigation wastes treatment energy and a limited resource. Designers reduce demand through efficient fixtures, and they use alternative sources, such as captured rainwater or greywater, for non-drinking uses where local rules allow.

Question 26

What is greywater and how is it reused in buildings?

Accepted Answer

Greywater is lightly used water from showers, bathroom sinks, and laundry that does not contain significant human waste. After simple filtration and treatment, it can be reused for toilet flushing or landscape irrigation. Because greywater must be kept separate from drinking water, plumbing systems need clear labeling, dedicated piping, and local approval before installation.

Question 27

How can rainwater harvesting help a building site perform better?

Accepted Answer

Rainwater harvesting collects runoff from roofs and stores it in tanks or cisterns for later use, reducing demand on municipal supply. Harvesting also reduces the volume and peak flow of stormwater leaving the site, which eases pressure on drainage systems and can lessen erosion.

Question 28

What is a green roof and what ecological benefits does it provide?

Accepted Answer

A green roof is a roof assembly that supports vegetation over a waterproof membrane, using a growing medium and drainage layer. It can absorb rainfall, reduce stormwater runoff, provide habitat for insects and birds, and moderate roof surface temperatures. Green roofs also add some insulation, but structural loads must be designed carefully.

Question 29

Why is stormwater management important on developed sites?

Accepted Answer

Development replaces permeable ground with roofs and pavement, so rain runs off quickly instead of soaking into the soil. This increases flooding risk downstream, carries pollutants such as oil and sediment into waterways, and can erode streambanks. Good stormwater management slows, filters, and infiltrates runoff on site.

Question 30

What is construction and demolition waste and why is it a concern?

Accepted Answer

Construction and demolition waste includes materials generated during building, renovation, and tear down, such as concrete, wood, drywall, metal, and masonry. These materials can fill landfills quickly when mixed together, and many are recyclable if sorted on site. Good practice includes waste audits, deconstruction, and designing for material recovery from the start.

Question 31

How does deconstruction differ from conventional demolition in practice?

Accepted Answer

Deconstruction is the careful, sequenced dismantling of a building so that components can be recovered, graded, and reused or recycled. Demolition typically knocks structures down quickly, mixing materials together and sending most of them to disposal. Deconstruction takes more planning and labor time, but it can preserve valuable materials and reduce landfill volumes.

Question 32

How can designers protect biodiversity on a project site?

Accepted Answer

Designers protect biodiversity by keeping existing trees, wetlands, and native vegetation where possible, and by avoiding fragmentation of habitat corridors. Planting native species supports local insects, birds, and soil organisms, and it usually needs less irrigation and chemical care over time. Lighting should be shielded to limit disruption to nocturnal wildlife, and construction should protect root zones and soil during work.

Question 33

What is life cycle assessment and what does it measure?

Accepted Answer

Life cycle assessment is a structured method for quantifying the environmental impacts of a product or system across its stages, from raw material extraction through manufacturing, use, and end of life. It typically tracks indicators such as energy use, greenhouse gas emissions, water use, and resource depletion.

Question 34

What is a system boundary in life cycle assessment and why does it matter?

Accepted Answer

System boundary defines which life cycle stages, processes, and flows are included in the analysis. A narrow boundary may leave out significant impacts, such as transport or maintenance, while a broad one can make studies complex and costly. Stating the boundary clearly lets readers judge whether a result is relevant to their decision.

Question 35

What is a functional unit and why is it needed?

Accepted Answer

A functional unit is the measure of performance that a study uses as its basis for comparison. Comparisons between alternatives are only fair when they deliver the same service, so a functional unit ensures that a durable product and a short lived one are assessed on equal terms.

Question 36

Why should a designer examine operational and embodied impacts together?

Accepted Answer

Operational impacts come from energy and water used while a building operates, while embodied impacts come from producing, transporting, and replacing its materials. In efficient buildings, embodied impacts can make up a larger share of the total, so focusing on one alone may shift burdens rather than reduce them. A combined view helps designers choose strategies that lower overall impact across the full service life.

Question 37

How does design for adaptability extend a building's useful life?

Accepted Answer

Adaptable buildings are designed with flexible floor plans, generous floor-to-ceiling heights, and services that can be upgraded without major demolition. This allows changes in use, such as converting offices to housing, without tearing down the structure. Extending service life spreads the environmental cost of construction across more years of use.

Question 38

What is a design charrette and how does it support sustainable goals?

Accepted Answer

A design charrette is an intensive, collaborative workshop in which stakeholders and design professionals work together to explore options and solve problems within a short period. It is useful for setting sustainability targets, testing strategies such as daylighting and water reuse, and building shared ownership of decisions.

Question 39

What is green building certification and what should users keep in mind?

Accepted Answer

Green building certification is a third-party rating or verification system that scores a project against defined sustainability criteria. Certification can help owners set goals, communicate performance, but scores reflect the criteria and weighting used by each system. Users should read the criteria rather than treating a plaque as proof of every outcome.

Question 40

How should designers use lifecycle findings during a project?

Accepted Answer

Designers should run quick screening studies early, when design changes are cheap, and then refine the analysis for the most influential decisions. Results are most useful when they are compared with clear alternatives, such as different structural systems or insulation levels. Findings should be shared in plain language, with assumptions and limitations stated.

Sustainable Design Principles Flashcards

1Foundations of sustainable design

2Materials and resource selection

3Energy and passive strategies

4Water, waste and ecosystems

5Lifecycle assessment and applied practice

Learning Resources